クロムめっき初期の残留ひずみに及ぼす下地金属の影響

概要

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The feasibility of using an electric resistance wire strain gauge on the reverse side of metal substrates, to detect the influence of the substrate metal on the average strain in the deposit obtained from a conventional chromium plating bath and on the average strain in substrates deformed by hydrogen codeposition and absorption in a sulfuric acid solution was studied. The following results were obtained.(1) The strain gauge on the substrate was highly sensitive to slight strain deformation of the substrate during electrolysis. (2) The larger the amount of hydrogen absorbed by a substrate, the greater its compressive strain deformation in the early stage of electroplating. In this study, the compressive strain deformation of substrates was in the order of Ti>Fe>Ni>SUS>Ni-P alloy, as was the capacity to absorb hydrogen. (3) Titanium substrates having the greatest compressive strain deformation due to hydrogen absorption showed very poor adhesion to chromium films deposited on them.
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