A corrosion-resistant surface is obtained on steel by a two-step anodization process in which 8-hydroxyquinoline (HQ) is added to the borate anodizing bath in the second step. Additional corrosion resistance is obtained in neutral halide media by a chromate post-treatment. It is conjectured that a multilayer structure impedes the flow of electrons necessary for the oxygen reduction reaction, and the surface is inhibited for the cathodic reaction. The high coverage of the iron surface by the organic complex leads to (1) insulation of the iron from the environment and (2) an inhibition of the anodic reaction.

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National Association of Corrosion Engineers
1987
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