Abstract
ZnSn alloy coatings containing 10%–20% tin with good appearance were deposited from slightly acidic sulphate electrolytes. The effect of the concentration of tin sulphate and the cathodic current density on the composition and the structure of the alloy deposits was investigated. The partial deposition rates for Zn and Sn from electrolytes containing various brightener concentrations at a definite potential were determined. An increase in the concentration of organic additive from 1 to 5 ml 1 −1 leads to an abrupt decrease in zinc deposition rate, while the tin deposition rate decreases slowly. A further increase in brightener (organic additive) concentration does not affect particularly the deposition rate of either metal. The protective properties of ZnSn coatings were investigated by means of the Paatsch test. It is established that the corrosion resistance of ZnSn alloy deposits is better than the corrosion resistance of Zn and ZnCo (0.3%–1.3% Co) coatings.
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