Aerosol corrosion inhibitors
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to corrosion inhibitor compositions which are useful in inhibiting corrosion in aerosol products. 
     2. Description of the Prior Art 
     Many products designed for household, personal, automotive and other types of use are available as aerosol products. Typical examples of such products include personal products such as hair care products (sprays, coloring agents and styling/conditioning mousses), deodorants, antiperspirants, first aid sprays, and colognes; household products such as waxes, polishes, pan sprays, insecticides and room fresheners; automotive products such as cleaners and polishes; industrial products such as cleaners, lubricants and mold release agents; and animal care products such as tick and flea repellants. 
     Although some aerosol products are packaged in glass bottles or aluminum cans or lined steel cans, most formulations are loaded into unlined cans made of tin-plated steel. While the tin affords protection against corrosion, the thinness of the coating, imperfections in the surface, wear and tear, and chemical action may ultimately expose the steel to the contents of the can and corrosion can result. When aerosol formulations contain less than about 80 ppm (parts per million) water, corrosion of tin-plate cans is not generally a serious problem. However, if the water content of an aerosol formulation is more than 80 ppm, problems due to corrosion are more likely to occur. 
     The introduction of dimethyl ether (DME) as an aerosol propellant has opened the way to the use of more water-based aerosol formulations and made possible the manufacture of products of lesser flammability and lower ingredient cost. However, the use of water in such aerosol formulations also increases the problem of corrosion on the interior of the tin-plated steel cans which are so widely used, thus leading to contamination of the aerosol product and ultimately to leaking of the can if corrosion is severe enough. For this reasion, corrosion inhibitors are used with aerosol propellants containing DME, when this propellant is to be used in tin-plated steel cans containing a water-based formulation. 
     The matter of inhibiting corrosion in an aerosol can presents the dual problem of achieving corrosion inhibition in a system where there is both liquid and vapor phase contact with the metal. In a system that contains DME and water, corrosion of the can in areas in contact with the vapor phase is aggravated by the fact that relatively large amounts of water vapor are present along with the DME propellant in the vapor space above the liquid contents of the container. For example, the vapor phase of a 95/5 wt % dimethyl ether/water system contains 7,750 ppm water vapor at 70° F. (21.1° C.). Moreover, the addition of ethanol to a DME/water system will often exacerbate the problem of vapor phase corrosion. A 90/5/5 (wt %) DME/ethanol/water system will contain 9,100 ppm water vapor at 70° F. 
     SUMMARY OF THE INVENTION 
     Many commercially available corrosion inhibitors are either ineffective for aerosol systems containing DME or they fail to provide adequate protection against both liquid phase and vapor phase corrosion. It often happens that a corrosion inhibitor gives good protection where the liquid phase is in contact with the can but fails to provide protection in areas where the interior surfaces of the can are in contact with vapor during storage. The reverse can also occur where the inhibitor gives good protection on the interior where there is contact with vapor, but poor protection where liquid normally contacts the container. The present invention provides an improvement in aerosol compositions containing an aqueous aerosol-dispersible media and a propellant gas in which the improvement comprises the presence of a corrosion inhibitor in the aerosol composition in a minor amount sufficient to provide corrosion inhibition to the composition. The corrosion inhibitor which constitutes the improvement in the aerosol composition is effective against both vapor phase and liquid phase corrosion, and it is comprised of about 15 to 85 wt % of a nitroalkane containing 1-3 carbon atoms and 85 to 15 wt % of an amine neutralized phosphate ester selected from the group consisting of 2-ethylhexylamine salt of mixed mono- and di-isooctyl acid phosphate, tertiary C 12   alkyl primary amine salt of mixed mono- and di-isooctyl acid phosphate, dimethylamine salt of mixed mono- and di-butoxyethyl acid phosphate and 2-ethylhexylamine salt of mixed mono- and di-tridecyl acid phosphate. Such corrosion inhibitors are useful in a wide variety of aerosol compositions where there is a need to protect the container from corrosive attack. As a general rule, this includes aerosol compositions in which the formulation is water-based. Because of the compatibility of DME with water, it is common in the aerosol industry to use DME as the propellant gas either alone or in combination with other well known aerosol propellants. Propellants such as chlorodifluoromethane (FC-22), 1-chloro-1,1-difluoroethane (FC-142b), 1,1-difluoroethane (FC-152a), hydrocarbons such as butane, isobutane and propane and compressed gases such as CO 2  and nitrogen and mixtures of these propellants can be used in water-based aerosol formulations with or without DME. The corrosion inhibitor compositions of this invention can be used in aerosols containing any of these propellants or combinations thereof. The introduction of the inhibitor into the propellant prior to loading into the aerosol can is a convenient way to incorporate the inhibitor into the final aerosol formulation, and therefore, one of the objects of the invention to provide aerosol propellant compositions containing one or more propellants, such as those described above, in combination with the corrosion inhibitor in an amount sufficient to provide corrosion inhibition in water-based aerosols. 
     The effectiveness of the two components of the corrosion inhibitor compositions of the invention is not additive or supplementary but is greater than expected or predicted from the performance of the individual ingredients. Thus, neither the nitroalkanes nor the amine neutralized phosphate esters performed entirely satisfactorily as corrosion inhibitors in the liquid or the vapor phase of the aerosol formulations evaluated. Hence, it is clear that the corrosion inhibitor compositions of the invention are not simply blends of liquid phase and vapor phase inhibitors. 
     DETAILED DESCRIPTION 
     The nitroalkanes used in the corrosion inhibitor composition of the invention are commercially available materials. Nitromethane is the preferred nitroalkane, but other nitroalkanes such as nitroethane and 1-nitropropane can also be used. The amine neutralized phosphate esters are also commercially available products. The phosphate esters can be prepared by the addition of P 2  O 5  to an alcohol, such as isooctyl alcohol, at a rate which will allow the temperature to be maintained in the range of about 50° to 55° C. Reaction occurs in the ratio of three mols of alcohol to one mol of P 2  O 5  thus producing a mixture of mono- and di-esters in a mol ratio of 1:1. To obtain the products used in the present invention the ester mixture is neutralized by contacting the mixture with an amine, such as 2-ethylhexyl amine or diethyl amine, in an amount that will provide one mol of amine for each equivalent of phosphate ester, assuming the equivalent weight of the ester to be the average of the molecular weights of the mono- and di-esters. The chemical reactions for the preparation are as follows: ##STR1## where R&#39; is either C 2  H 5 , C 8  H 17  or C 12  H 25  and R&#34; is H or C 2  H 5 . 
     The proportion of the two constituents that form the inhibitor composition can be in the range of 15 to 85 wt % nitroalkane and 85 to 15 wt % amine neutralized phosphate ester. A preferred range is 40 to 60 wt % nitroalkane and 60 to 40 wt % of the amine neutralized phosphate ester. A 50/50 mixture by weight is a preferred composition, and nitromethane is the preferred nitroalkane. The optimum concentration of inhibitor composition needed to obtain effective corrosion inhibition will, of course, vary with the formulation in which it is to be used, and it can be determined by storage tests, such as those described in the Examples. Generally, the effective concentration range is 0.15 to 2 wt % based on the total weight of the aerosol formulation including the weight of a propellant as well as the weight of the other ingredients. A preferred weight range is 0.15 to 0.5 wt % of the aerosol formulation. The inhibitors can be added directly to the aerosol can either alone or mixed with other non-pressurized ingredients, or if preferred, they can be introduced as solutions in the propellant in an amount which when incorporated with the other ingredients will provide the desired 0.15 to 2 wt % of corrosion inhibitor in the final composition. 
     The composition of the aqueous aerosol-dispersible media which is, in essence, the formulation containing the active ingredients, will, quite naturally, depend upon the use for which the aerosol is designed. Such formulations are well known to persons skilled in the art, and the choice of formulation is not critical to the use of the invention as long as the media is not too highly acidic or too basic. As a general rule the pH of the contents of the can should be between about 4.5 and about 10. Also, the use of the corrosion inhibitors in tin-plated cans with dry-type antiperspirants containing aluminum chlorohydrate is not recommended. Lined cans should be used in these instances. 
    
    
     EXAMPLES 
     Sixty-day corrosion tests at 120° F. (48.9° C.) were run on the corrosion inhibitors in six aerosol formulations. These formulations were selected as being representative of commercial products, in their chemical compositions. Distilled water was used in each of the five formulations because it was readily available in the laboratory. However, similar results would be expected with deionized water which is often used in commercial aerosols. 
     
         ______________________________________
Component             Wt. %
______________________________________
Formulation No. 1
Room Freshener (pH = 6)
Rose fragrance        1.40
Ethanol (SDA40-1)     19.60
Water (distilled)     49.00
Dimethyl ether        30.00
Formulation No. 2
Insecticide (pH = 6)
Natural Pyrethrins    1.50
Piperonyl butoxide    0.65
Polyglyceryl fatty acid
                      0.97
ester surfactant
(Witco Chemical Corp.)
Ethanol (SDA40-1)     10.01
Water (distilled)     51.87
Dimethyl ether        35.00
Formulation No. 3
Hairspray (pH = 7.2)
Vinyl acetate/crotonic acid/
                      2.50
vinyl neodecanoate
terpolymer
2-amino-2-methyl-1-propanol
                      0.20
Modified lauric alkanolamide
                      0.10
Silicone glycol copolymer
                      0.05
Ethanol (SDA 40-1)    37.15
Water (distilled)     10.00
Chlorodifluoromethane (FC-22)
                      20.00
Dimethyl ether        30.00
Formulation No. 4
Insecticide (pH = 5)
Phosphorothioic acid O,
                      0.98
O--diethyl O--(3,5,6-trichloro-
2-pyridyl) ester
Natural pyrethrins    0.06
Piperonyl butoxide    0.13
Polyglyceryl fatty acid ester
                      0.20
surfactant
Water (distilled)     63.63
Dimethyl ether        35.00
Formulation No. 5
Hair Spray (pH = 5)
Methyl vinyl ether/maleic acid
                      1.60
mono ethyl ester copolymer
2-amino-2-methyl-1-propanol
                      0.06
Ethanol SDA 40-1)     67.56
Dioctyl sebacate      0.10
Water (distilled)     10.68
FC-22                 8.00
Dimethyl ether        12.00
Formulation No. 6
Hair Spray (pH =  5)
Methyl vinyl ether/maleic acid
                      1.50
mono ethyl ester copolymer
2-amino-2-methyl-1-Propanol
                      0.06
Ethanol (SDA 40-1)    63.34
Dioctyl sebacate      0.10
Water (distilled)     10.00
Dimethyl ether        25.00
______________________________________
 
    
     Procedure 
     All of the examples were prepared using the following procedure. The active ingredients were weighed individually into an eight-ounce three-piece aerosol can 21/8&#34; in diameter and 5 9/16&#34; long, except when the corrosion inhibitors were added to the aerosol can as a solution in the propellant (noted in tables). The can was purged with dichlorodifluoromethane (FC-12) vapor to displace the air in the container. The aerosol can valve was then placed into the can and crimped. The propellants were introduced into the can as liquids through the aerosol valve. Volume amounts corresponding to the weights of the propellants were calculated prior to loading, and a glass, calibrated, pressure buret was used to measure and transfer the liquids from storage cylinders to the can. A nitrogen gas pressure of 100 psig was applied to the buret to aid in transferring the liquids from the buret to the can. After the propellant was loaded, the can was weighed, and the weight of propellant recorded. 
     The aerosol cans used in the corrosion tests were commercially available containers and are described in trade literature as: one inch round dome top unlined aerosol containers, size 202×509  (21/8&#34; diameter, 5 9/16&#34; can wall height), 0.25 lb. electrolytic tin-plated (ETT), full concave bottom with welded side seam. 
     A corrosion test rating system was used which provides a complete visual description of the appearance of the interior surface of the tin-plated steel aerosol cans after 60 days storage at 120° F. 
     
         ______________________________________
CAN CORROSION - RATING SYSTEM
Rating*           Description
______________________________________
0                 No Corrosion
1                 Trace Corrosion
2                 Light Corrosion
3                 Moderate Corrosion
4                 Heavy Corrosion
5                 Severe Corrosion
______________________________________
 *This numerical rating is an overall assessment of the total can
 (tinplate, joints and side seams) and represents the primary rating of a
 test. A rating of 0-2 is considered effective and 3 or greater is a faile
 rating.
 
    
     
                                           TABLE #1
__________________________________________________________________________
CORROSION TEST DATA
              Corrosion
                    Corrosion
              Test  Test   Test
                               Description of
Corrosion Inhibitor
          Wt. %
              Procedure
                    Medium Rating
                               Test Can Corrosion
__________________________________________________________________________
None      --  60 days at
                    Formulation
                           5   Bottom detinned;
              at 120° F.
                    No. 1      rust on walls;
                               vapor phase rusted
Diethylamine salt
          0.45
              60 days at
                    Formulation
                           4   Vapor phase
of mixed mono- and
              at 120° F.
                    No. 1      rusted
di-butoxyethyl acid
phosphate
Tertiary C.sub.12 alkyl
          0.40
              60 days at
                    Formulation
                           3   Moderate vapor
primary amine salt
              at 120° F.
                    No. 1      phase corrosion
of mixed mono- and
di-isooctyl acid
phosphate
Nitromethane
          0.50
              60 days at
                    Formulation
                           5   Bottom detinned;
              at 120° F.
                    No. 1      rust on walls;
                               vapor phase rusted
Diethylamine salt
           0.225
              60 days at
                    Formulation
                           1   Slight rusting on
of mixed mono- and
              at 120° F.
                    No. 1      side seam
di-butoxyethyl acid
phosphate
Nitromethane
          0.25
Tertiary C.sub.12 alkyl
          0.20
              60 days at
                    Formulation
                           0   No corrosion
primary amine salt
              at 120° F.
                    No. 1
of mixed mono- and
di-isooctyl acid
phosphate
Nitromethane
          0.25
__________________________________________________________________________
 
    
     
                                           TABLE #2
__________________________________________________________________________
CORROSION TEST DATA
              Corrosion
                    Corrosion
              Test  Test   Test
                               Description of
Corrosion Inhibitor
          Wt. %
              Procedure
                    Medium Rating
                               Test Can Corrosion
__________________________________________________________________________
None      --  60 days at
                    Formulation
                           5   Severe detinning
              120° F.
                    No. 2      in liquid and
                               vapor zones;
                               considerable vapor
                               phase corrosion
2-Ethylhexylamine
          0.40
              60 days at
                    Formulation
                           2   Light vapor phase
salt of mixed mono-
              120° F.
                    No. 2      corrosion
and di-isooctyl acid
phosphate
2-Ethylhexylamine
          0.40
              60 days at
                    Formulation
                           2   Light vapor phase
salt of mixed mono-
              120° F.
                    No. 2      corrosion
and di-tridecyl acid
phosphate
Tertiary C.sub.12 alkyl
          0.40
              60 days at
                    Formulation
                           3   Moderate vapor
primary amine salt
              120° F.
                    No. 2      phase corrosion
of mixed mono- and
di-isooctyl acid
phosphate
Nitromethane
          0.50
              60 days at
                    Formulation
                           3   Detinning and
              120° F.
                    No. 2      corrosion in
                               liquid; Moderate
                               vapor phase rusting
2-Ethylhexylamine
          0.20
              60 days at
                    Formulation
                           0   No corrosion
salt of mixed mono-
              120° F.
                    No. 2
and di-isooctyl acid
phosphate
Nitromethane
          0.25
2-Ethylhexylamine
          0.20
              60 days at
                    Formulation
                           0   No corrosion
salt of mixed mono-
              120° F.
                    No. 2
and di-tridecyl acid
phosphate
Nitromethane
          0.25
Tertiary C.sub.12 alkyl
          0.20
              60 days at
                    Formulation
                           0   No corrosion
primary amine salt
              120° F.
                    No. 2
of mixed mono- and
di-isooctyl acid
phosphate
Nitromethane
          0.25
__________________________________________________________________________
 
    
     
                                           TABLE #3
__________________________________________________________________________
CORROSION TEST DATA
              Corrosion
                    Corrosion
              Test  Test   Test
                               Description of
Corrosion Inhibitor
          Wt. %
              Procedure
                    Medium Rating
                               Test Can Corrosion
__________________________________________________________________________
None      --  60 days at
                    Formulation
                           5   Severe liquid phase
              120° F.
                    No. 3      detinning; spots
                               of rust and
                               detinning in vapor
                               zone
2-Ethylhexylamine
          0.40
              60 days at
                    Formulation
                           4   Severe liquid
salt of mixed mono-
              120° F.
                    No. 3      phase detinning;
and di-isooctyl                no rusting evident
acid phosphate
Nitromethane
          0.50
              60 days at
                    Formulation
                           5   Same as control,
              120° F.
                    No. 3      except large rust
                               spots in both
                               phases
2-Ethylhexylamine
          0.20
              60 days at
                    Formulation
                           2   Light liquid phase
salt of mixed mono-
              120° F.   detinning
and di-isooctyl
acid phosphate
Nitromethane
          0.25
2-Ethylhexylamine
          0.40
              60 days at
                    Formulation
                           1   Trace liquid phase
salt of mixed mono-
              120° F.
                    No. 3      detinning
and di-isooctyl
acid phosphate
Nitromethane
          0.50
__________________________________________________________________________
 
    
     
                                           TABLE #4
__________________________________________________________________________
CORROSION TEST DATA
              Corrosion
                    Corrosion
              Test  Test   Test
                               Description of
Corrosion Inhibitor
          Wt. %
              Procedure
                    Medium Rating
                               Test Can Corrosion
__________________________________________________________________________
None      --  60 Days at
                    Formulation
                           5   Severe corrosion in
              120° F.
                    No. 4      liquid and vapor
                               phases
2-Ethylhexylamine
          0.40
              60 Days at
                    Formulation
                           2   Light vapor phase
salt of mixed mono-
              120° F.
                    No. 4      corrosion
and di-isooctyl
acid phosphate
2-Ethylhexylamine
          0.40
              60 Days at
                    Formulation
                           3   Moderate vapor
salt of mixed mono-
              120° F.
                    No. 4      phase corrosion
and di-tridecyl
acid phosphate
Nitromethane
          0.50
              60 Days at
                    Formulation
                           5   Similar to control
              120° F.
                    No. 4
2-Ethylhexylamine
          0.20
              60 Days at
                    Formulation
                           0   No corrosion
salt of mixed mono-
              120° F.
                    No. 4
and di-isooctyl
acid phosphate
Nitromethane
          0.25
2-Ethylhexylamine
          0.20
              60 days at
                    Formulation
                           0   No corrosion
salt of mixed mono-
              120° F.
                    No. 4
and di-tridecyl
acid phosphate
Nitromethane
          0.25
__________________________________________________________________________
 
    
     
                                           TABLE #5
__________________________________________________________________________
CORROSION TEST DATA
              Corrosion
                    Corrosion
              Test  Test   Test
                               Description of
Corrosion Inhibitor
          Wt. %
              Procedure
                    Medium Rating
                               Test Can Corrosion
__________________________________________________________________________
None      --  60 days at
                    Formulation
                           5   Liquid phase
              120° F.
                    No. 5      blackened from
                               tinning; dome
                               moderately
                               detinned; rust on
                               side seam and
                               bottom joint
2-Ethylhexylamine
          0.40
              60 days at
                    Formulation
                           3   Moderate vapor
salt of mixed mono-
              120° F.
                    No. 5      phase detinning
and di-isooctyl
acid phosphate
Nitromethane
          0.50
              60 days at
                    Formulation
                           4   Heavy black
              120° F.
                    No. 5      corrosion at
                               bottom joint;
                               vapor phase badly
                               rusted
2-Ethylhexylamine
          0.20
              60 days at
                    Formulation
                           2   Light dome
salt of mixed mono-
              120° F.
                    No. 5      detinning
and di-isooctyl
acid phosphate
Nitromethane
          0.25
2-Ethylhexylamine
          .sup. 0.20.sup. a
              60 Days at
                    Formulation
                           2   Light dome
salt of mixed mono-
              120° F.
                    No. 5      detinning
and di-isooctyl
acid phosphate
Nitromethane
          0.25
2-Ethylhexylamine
          0.40
              60 Days at
                    Formulation
                           1   Slight dome
salt of mixed mono-
              120° F.
                    No. 5      detinning
and di-isooctyl
acid phosphate
Nitromethane
          0.50
2-Ethylhexylamine
           0.40.sup.a
              60 Days at
                    Formulationm
                           1   Slight dome
salt of mixed mono-
              120° F.
                    No. 5      detinning
and di-isooctyl
acid phosphate
Nitromethane
          0.50
2-Ethylhexylamine
          0.80
              60 Days at
                    Formulation
                           1   Slight dome
salt of mixed mono-
              120° F.
                    No. 5      detinning
and di-isooctyl
acid phosphate
Nitromethane
          1.00
__________________________________________________________________________
 .sup.a Corrosion inhibitors were dissolved in propellant and added to
 aerosol can as propellant solution. In all other examples, corrosion
 inhibitors and propellants were added individually to aerosol can.
 
    
     
                                           TABLE #6
__________________________________________________________________________
CORROSION TEST DATA
              Corrosion
                    Corrosion
              Test  Test   Test
                               Description of
Corrosion Inhibitor
          Wt. %
              Procedure
                    Medium Rating
                               Test Can Corrosion
__________________________________________________________________________
None      --  60 Days at
                    Formulation
                           5   Extensive detinning
              120° F.
                    No. 6      in liquid and
                               vapor phases;
                               rusting at dome
                               crimp
2-Ethylhexylamine
          0.40
              60 Days at
                    Formulation
                           3   Moderate detinning
salt of mixed mono-
              120° F.
                    No. 6      in vapor zone;
and di-isooctyl                slight rusting at
acid phosphate                 dome crimp
Nitromethane
          0.50
              60 Days at
                    Formulation
                           3   Moderate detinning
              120° F.
                    No. 6      of walls and dome;
                               corrosion at side
                               seam and dome crimp
2-Ethylhexylamine
          0.08
              60 Days at
                    Formulation
                           2   Light detinning of
salt of mixed mono-
              120° F.
                    No. 6      dome
and di-isooctyl
acid phosphate
Nitromethane
          0.10
2-Ethylhexylamine
          .sup. 0.08.sup.a
              60 days
                    Formulation
                           2   Light detinning of
salt of mixed mono-
              at 120° F.
                    No. 6      dome
and di-isooctyl
acid phosphate
Nitromethane
          0.10
2-Ethylhexylamine
          0.20
              60 days
                    Formulation
                           1   Slight detinning
salt of mixed mono-
              at 120° F.
                    No. 6      of dome
and di-isooctyl
acid phosphate
Nitromethane
          0.25
2-Ethylhexylamine
          .sup. 0.20.sup.a
              60 days
                    Formulation
                           1   Slight detinning
salt of mixed mono-
              at 120° F.
                    No. 6      of dome
and di-isooctyl
acid phosphate
Nitromethane
          0.25
2-Ethylhexylamine
          0.40
              60 days at
                    Formulation
                           0   No corrosion
salt of mixed mono-
              120° F.
                    No. 6
and di-isooctyl
acid phosphate
Nitromethane
          0.50
2-Ethylhexylamine
          .sup. 0.40.sup.a
              60 days at
                    Formulation
                           0   No corrosion
salt of mixed mono-
              120° F.
                    No. 6
and di-isooctyl
acid phosphate
Nitromethane
          0.50
2-Ethylhexylamine
          0.80
              60 days at
                    Formulation
                           0   No corrosion
salt of mixed mono-
              120° F.
                    No. 6
and di-isooctyl
acid phosphate
Nitromethane
          1.00
2-Ethylhexylamine
          0.08
              60 days at
                    Formulation
                           1   Slight detinning
salt of mixed mono-
              120° F.
                    No. 6      of dome
and di-isooctyl
acid phosphate
Nitromethane
          0.50
2-Ethylhexylamine
          0.16
              60 days at
                    Formulation
                           1   Slight detinning
salt of mixed mono-
              120° F.
                    No. 6      of dome
and di-isooctyl
acid phosphate
Nitromethane
          0.50
2-Ethylhexylamine
          0.40
              60 days at
                    Formulation
                           1   Slight detinning
salt of mixed mono-
              120° F.
                    No. 6      of dome
and di-isooctyl
acid phosphate
Nitromethane
          0.20
2-Ethylhexylamine
          .sup. 0.40.sup.a
              60 days at
                    Formulation
                           1   Slight detinning
salt of mixed mono-
              120° F.
                    No. 6      of dome
and di-isooctyl
acid phosphate
Nitromethane
          0.20
2-Ethylhexylamine
          0.40
              60 days at
                    Formulation
                           1   Slight detinning
salt of mixed mono-
              120° F.
                    No. 6      of dome
and di-isooctyl
acid phosphate
Nitromethane
          0.10
__________________________________________________________________________
 .sup.a Corrosion inhibitors were dissolved in propellant and added to
 aerosol cans as propellant solutions. In all other examples, corrosion
 inhibitors and propellants were added individually to aersol cans.
 
    
     
                                           TABLE #7
__________________________________________________________________________
CORROSION TEST DATA
              Corrosion
                    Corrosion
              Test  Test   Test
                               Description of
Corrosion Inhibitor
          Wt. %
              Procedure
                    Medium Rating
                               Test Can Corrosion
__________________________________________________________________________
None      --  60 Days at
                    Formulation
                           5   Severe detinning in
              120° F.
                    No. 2      liquid and vapor
                               zone; considerable
                               corrosion in both
                               phases
Nitroethane
          0.50
              60 Days at
                    Formulation
                           3   Some detinning in
              120° F.
                    No. 2      liquid phase; rust
                               spots in liquid
                               and vapor phases
1-Nitropropane
          0.50
              60 Days at
                    Formulatin
                           3   Some detinning in
              120° F.
                    No. 2      liquid phase; rust
                               spots in liquid
                               and vapor phase
2-Ethylhexylamine
          0.20
              60 Days at
                    Formulation
                           1   Trace detinning in
salt of mixed mono-
              120° F.
                    No. 2      vapor zone
and di-isooctyl
acid phosphate
Nitroethane
          0.25
2-Ethylhexylamine
          0.20
              60 days at
                    Formulation
                           1   Trace detinning in
salt of mixed mono-
              120° F.
                    No. 2      vapor zone
and di-isooctyl
acid phosphate
1-Nitropropane
          0.25
__________________________________________________________________________