The electrochemical corrosion of tin in various concentrations of nitric acid has been studied. The change in corrosion rates with nitric acid concentration has revealed the occurrence of four distinct corrosion processes. The corrosion of tin was found to be maximum at 4·5M HNO3, and at 14·4M HNO3 the metal is passivated. The effect of various inorganic anions was investigated: it wasfound that some of these inhibit corrosion while others accelerate it. The anions added were NO2−, NO3−, Cl−, CrO42−, SO42−, S2O52−, HPO42−, H2PO−4, IO3−, and B4O72−. Of these, Cl− and CrO42− were studied in some detail. Acetate ions were also found to inhibit the corrosion of tin in nitric acid.
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