Abstract
Oxygen reduction rate on galvanized steel and ZnAlMg coated steel decreased in presence of corrosion products identified as basic zinc salts (BZS) and layered double hydroxides (LDH). Under cathodic polarization of galvanized steel the transformation BZS→ZnO occurred, resulting in a loss of the inhibiting effect. It did not happen on ZnMgAl. Acid–base titrations of Zn2+-containing solutions with and without additives demonstrated that (1) Mg2+ ions delay the transformation BZS→ZnO; (2) Al3+ forms LDH which remains stable even at pH>12.5. A residual Al “skeleton” was observed in corrosion products formed on ZnMgAl. It may increase the compactness of the patinas.
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