The Effect of Indium Sulfate in Chromium Plating Baths

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Abstract
Addition of indium sulfate to the regular 100 to 1 chromium plating bath permitted the formation of a bright electrodeposit at 32°C at current densities considerably above the accepted bright plating range. The deposit was more nearly crack‐free than that usually formed and it was a better protective coating according to a salt drop test. It was more adherent both to steel and to copper than deposits formed from the regular bath in the bright range. Indium was present in the deposit to only a very small amount, if at all.
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