亜鉛めっきにおける鋼への水素侵入

概要

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The hydrogen permeation current of steels was measured during zinc electroplating using baths of zincate, zinc chloride-ammonium chloride and zinc sulfate.Shortly after the start of electroplating, the zinc chloride-ammonium chloride bath showed higher hydrogen permeation current than the other baths because of its low pH due to a large amount of NH4Cl, but after 40 minutes it showed lower permeation current than the zincate bath, because there were few pin holes. The zinc sulfate bath showed lower hydrogen permeation current than the other baths. With 40 minutes of electroplating using the zinc chloride-ammonium chloride bath, the quantity of permeated hydrogen was lower than with the zincate bath. The quantity of permeated hydrogen in the zinc sulfate bath was almost the same as in the zinc chloride-ammonium chloride bath.
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