An electrodeposit of tin may be hardened by codepositing copper or antimony or both with tin. An acid tin-alloy bath may be made by adding soluble salts of either of these metals to the following fluoborate tin bath Gelatin/1 g To liter Free Fluoboric Acid/40 g To liter \b-Naphthol/1 g To liter Cresol Sulfonic Acid/20 g To liter Tin/40 g To liter
配制方法:
Copper carbonate may be used as a source of copper and antimony fluoride, as a source of antimony. One g/liter of copper will result in about 1% of copper in the deposit and 0.5 g/liter of antimony will yield about 1% of antimony in the deposit at a current density of 15 amp/sq ft. In continuous use, the bath can be maintained by adding the following agents at the following approximate times; plating tests are essential for continuous control. Gelatin: 0.2 g/liter once a week; \b-naphthol in alcohol to saturate the solution (about 0.5 g/liter) every 3 to 4 weeks; cresol sulfonic acid about 2 g/liter every 3 to 4 weeks.
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