ELECTROCHEMICAL BEHAVIOUR OF Al-BRASS IN SEAWATER
Corrosion of the Al-brass in 3.5 % NaCl solution and natural seawater was investigated with potentiodynamic polarization technique. Corrosion rate obtained in natural seawater was higher than in 3.56 % NaCl solution. The metallographic examinations indicated the occurrence of pitting corrosion in both cases.
Characteristics of the Al-Brasses Affected Corrosion Properties
The Al-brasses are considered corrosion resistant construction materials often used to pipe systems in energy industry, where they are exposed to flowing liquids environments. In that system the brasses are loaded chemically and mechanically. The aim of our research work is to compare corrosion properties of four Al-brasses produced by different manufactures because in operation conditions they have dissimilar reliability and durability. The examined Al-brasses have similar chemical composition but differ in microstructure, surface state what affects their corrosion and mechanical properties. The effect of the mentioned parameters on corrosion and mechanical susceptibility to degradation are investigated by chosen experimental methods.
Corrosion of tube and pipe alloys due to polluted sea‐water
Numerous failures of aluminium–brass heat-exchanger tubes and copper–nickel–iron sea-water pipes in polluted estuarine sea-water were found to be associated with sulphide films which stimulated pitting and stress-corrosion cracking at holidays (breaks) in the film. The use of sodium dimethyl dithiocarbamate which formed an insoluble copper–chelate film on the surface of these alloys was effective in combatting this deterioration.