Abstract
The corrosion behaviour of unchromated Zn, Zn-Co (0.6%), Zn-Fe (0.4%) and Zn-Ni (12%) coatings deposited from alkaline cyanide free solution was studied in a humid tropical climate and in accelerated chloride and sulfur dioxide cabinet tests. The presence of Ni or Co in the Zn matrix increases Zn coating corrosion resistance, while Fe does not change it. The statistical analysis of the data obtained showed that the specimens corrosion losses can be represented as an exponential equation as a function of time of wetness. In such case the corrosion losses in one year of wetness can be approximated as a linear function of accumulated Cl − and SO 2 pollutant deposition. The data indicate a more significant SO 2 influence on the coating corrosion rate that is due to Cl −.
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