being generically of amine origin enhances the bonding of an amine or amide cured protective coating the photo oxidation of aniline produces the familiar degradation product known as aniline black the formation of this blue black film on the surface of steel was initiated using aniline research was conducted by passing aniline vapor past a steel surface in the presence of ultraviolet radiation produced by a xenon arc or a mercury lamp natural daylight and an infrared heat lamp were used also it was found that condensation of aniline on the steel surface was required to produce appreciable darkening on the steel the mercury lamp irradiation produced this darkening much faster than the xenon arc or other photo energy sources corrosion experiments in a salt spray cabinet showed the thin film polymer to have a mitigating effect on the amount of corrosion developed subsequent work was done using different amino compounds placed into direct contact with steel photo oxidation was attempted using a george w gates amp company mercury vapor lamp model 420 u1 360 watts the reaction of the phenylenediamines as well as other amines more susceptible to ultraviolet photo oxidation than aniline were investigated the following amine compounds were used to investigate thin.