表面技術
Online ISSN : 1884-3409
Print ISSN : 0915-1869
ISSN-L : 0915-1869
パラジウムめっき鉄合金材の耐食性に及ぼす下地ニッケルめっき析出時のパルス波の効果
珍田 聡吉岡 修小泉 良一
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ジャーナル フリー

1994 年 45 巻 7 号 p. 691-694

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To prevent the corrosion of palladium-plated ferro-alloy bases for lead frams, the effect of pulse plating on nickel deposits used as the underlayer for palladium-plated layers was investigated.
The following results were obtained.
(1) For nickel deposition at a current density of 4A/dm2 and a pulse cycle time of 10ms, fine crystal grains and a smooth surface were obtained at a duty cycle of 9%.
(2) The nickel underlayers deposited using pulse current at a duty cycle of 9% improved the corrosion resistance of the palladium-plated ferro-alloy bases more than those deposited using smooth DC. These results suggest the feasibility of applying palladium plating to ferro-alloy lead frames.

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