A trial of quantitative estimation of Al-corrosion detected by neutron radiography.
Comparing the hydrogen content in aluminum hydroxides, one of the main components of Al-corrosion, with that in polyethylene sheets, corroded degree of practical Al-corrosions were estimated quantitatively by neutron radiography.
Determination of Nydrogen Content in Materials and Products by Neutron Radiography Method
When some materials and products made of them are placed in the hydrogenous medium the hydrogen in this medium is capable to accumulate in these materials due to the interaction to produce hydroxides, hydrides and other chemical compounds which induce the parameters of the corresponding products to become worse.
Californium-Based Neutron Radiography for Corrosion Detection in Aircraft
In support of an overall program aimed at minimizing disassembly and reducing inspection time during aircraft maintenance, a series of projects has been carried out to determine the feasibility of applying neutron radiographic techniques to the nondestructive (NDT) inspection of aircraft and aircraft components. These investigations have clearly demonstrated the superiority of neutron radiography over all other NDT techniques in its ability to detect surface and subsurface corrosion in aircraft structure. This capability is particularly significant where the corrosion is hidden behind thick metallic structural members. The neutron radiographic technique hays been applied successfully to detect corrosion in the wing tank of E-2C, C-130, and DC-9 aircraft; rear stabilators of F-4 and F-111 aircraft; aft spar, starboard and port wing, and rudder of the F-8; fuselage skin of the 727; rotary blades of AH-1 and SH-3 helicopters; rotary tail flaps of the UH-2 helicopter; and nose landing gear of A-7 aircraft.