無電解Pd-Ni-P合金めっきとその皮膜特性

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In terms of corrosion resistance, wear resistance and contact resistance, electrodeposited Pd-Ni alloy was a substitute for gold. This report describes the electroless plating of Pd-Ni-P alloys from ethylenediamine complex solutions containing sodium hypophosphite as a reducing agent, and properties of the deposits. The nickel content of the deposits and thier hardness were found to be proportional to the concentration of nickel ion in the baths. The hardness of 63mol% nickel alloy deposit was 750Hv. The deposits showed maximum hardness after heat treatment at 350°C, reaching over 1000Hv for alloys containing 10mol% nickel or more. An increase in the nickel content of the deposits led to some deterioration in solderability, but no appreciable changes were found in contact resistance, even after humidity testing for six days.
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