過剰電流密度で電析したニッケル皮膜

概要

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The orientation and microstructure of nickel electrodeposits are affected by the conditions of electrolysis. This study considers the effects of hydrogen on crystal structure and hardness of electrodeposited dull nickel. Dull nickel films were electrodeposited from a Watts bath under excess current density such that hydrogen generates positively, and their crystal structure, hardness and hydrogen content were investigated. The results are summarized as follows.(1) The preferential orientation changed from (200) to (220) under excess current density.(2) The hardness of the nickel films changed with current density, and a correlation was found between hardness and morphology.(3) The hydrogen content of the nickel films increased with current density, but no correlation was found between hydrogen content and hardness.
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