Abstract
Abstract The polarization behavior of various pure zinc, Al-Zn, and Zn-Ni coatings was studied to evaluate electrochemical methods for use in testing the performance of such coatings on sheet steel. Behavior in deaerated chloride solutions was found to simulate more nearly the good performance of pure zinc (galvanized) coatings in service. Al-Zn coatings exhibited low corrosion rates in both aerated and deaerated chloride solutions, yet they maintained active corrosion potentials and conferred galvanic cathodic protection to bare steel exposed in a scribe through the coating. The galvanic current, which provides cathodic protection for the steel in a scribe, was measured successfully using the polarization resistance technique.
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