無電解Ni-S-P合金めっき皮膜 : 電極特性

概要

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The structure and polarization properties of deposits containing a high level of sulfur, obtained from electroless Ni-S-P alloy plating baths by the addition of sodium thiosulfate were investigated.The following results were obtained:1) When the phosphorus content of the deposits was changed, the hydrogen overvoltage scarcely varied. As the phosphorus content in the deposits increased, their corrosion resistance was improved.2) Examination of X-ray diffraction patterns revealed that particle size increased with increasing sulfur content and decreasing phosphorus content in the deposits.3) Examination of polarization curves showed that hydrogen overvoltage decreased with increasing sulfur content in the deposits.4) The corrosion resistance of the deposits improved as the sulfur content in the deposits increased to 0.5%∼0.8%, and thereafter decreased.
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