Tin Zinc Plating

Tin-zinc alloys contain 70 to 90% Sn and 10 to 30% Zn. Cyanide, acid, and neutral commercial baths are available. Tin-zinc baths are expensive to operate because they require the use of special cast tin-zinc anodes. Tin-zinc alloys exhibit excellent solderability, ductility, and corrosion resistance.

Chromate posttreatments are limited to yellow or clear. The tin-zinc deposit is semibright as-plated and is used primarily as a functional coating. Tin-zinc is finding increasing application in the automotive and electronic industries and as a substitute for cadmium plating.

Additional information about tin-zinc coatings is contained in the article "Tin Alloy Plating" in this Volume.

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