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The ability of a fluoropolymer and an epoxy coating to protect steel against corrosion in 0.1 M H2S04 at 60 °C was evaluated by four techniques: (1) cathodic delamination, (2) tensile adhesion, (3) rate of blister formation, and (4) gas analysis of blisters. The data obtained show that acid diffuses through the coating to react with the steel surface to oxidize (corrode) it and to form hydrogen gas by the reduction of the hydrogen ion in the acid. If the generation of hydrogen occurs faster than its removal by diffusion through the coating or into the steel, a blister will form. If the rate of hydrogen formation is less than Its removal rate, there can be almost complete disbonding of the coating with no visible blisters.

the LPDO nitrides. This result is very different to the conventional APDO nitrides, in which only the N/O structure is obtained. The distinct O/N/O structure is conjectured to result in the good electrical properties for the LPDO nitrides. Finally, the oxidation mechanisms of the LPDO, APDO, and APWO of nitride films are also depicted.

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