次亜リン酸塩を還元剤とする低温タイプの無電解ニッケルめっき浴の開発

概要

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In recent years, electroless nickel coatings have been extensively used for various purposes in many fields of industry and a wide variety of functions have been required of the electroless nickel deposits. In this study, an electroless nickel plating bath operated at relatively low temperature has been developed, and the effects of certain factors (temperature, pH, and concentration of acetate and hypophosphite) on the deposition rate and phosphorous content of the electroless nickel deposits have been investigated in some detail. Deposits with phosphorus contents higher than 9wt% were found to be amorphous and to have improved properties with respect to tensile strength and corrosion resistance. The addition of an unsaturated compound such as maleate having a double bond will reduce the molar ratio of hydrogen gas to deposited Ni-P alloy, and also increase the phosphorus content of the deposits.
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