Zero-resistance ammeter (ZRA) measurements and a 23 full-factorial statistical experimental design were used to determine the effects of pH, oxygen, and red rust on the cathodic half-cell reaction on corroding electrogalvanized steel. Analysis of variance indicated that the red rust reduction reaction was dominant. The recently developed galvanic corrosion-mechanical wedging model for underfilm corrosion of painted galvanized steel was supported.

Subject
Cathodes, X-ray diffraction, Corrosion reactions, Acidity, Steel, Rust, Oxygen, Corrosion coupons, Zinc, Risk reduction, Galvanic corrosion, Paints, Electrolytes
Keywords:
anodic dissolution, cosmetic corrosion, electrogalvanized steel, Evans reaction, galvanic corrosion, oxygen reduction, underfilm corrosion, zero-resistance ammeter
NACE International
1996
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