Effect of Mixed Complexing Agents on Electroless NiB Plating.

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  • KIM Man
    Materials Processing Div., Korea Inst. of Machinery and Materials
  • IIZUKA Atsushi
    Advanced Research Center for Sci. and Eng., Waseda Univ.
  • KUBOMIYA Takayuki
    School of Sci. and Eng., Waseda Univ.
  • OSAKA Tetsuya
    Advanced Research Center for Sci. and Eng., Waseda Univ. School of Sci. and Eng., Waseda Univ.

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Other Title
  • 無電解ＮｉＢめっきにおける複合錯化剤の影響
  • ムデンカイ NiBメッキ ニ オケル フクゴウサクカザイ ノ エイキョウ

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Abstract

Based on the results of previous single complexing agents, we prepared mixed complexing agents for electroless NiB plating based on sodium citrate, and studied their characteristics. Complexing agents were mixed as follows: sodium citrate-sodium malonate, sodium citrate-glycine, sodium citrate-diethylenetriamine. The deposition rate from the mixed complexing agent bath was influenced by pH and complexing agent concentration, and mainly corresponded to mixed behavior except for sodium citrate-diethylenetriamine. The boron content of deposited films gradually increased with increasing sodium citrate concentration for the mixed complexing agent. The carbon content was highest as 0.72wt% at a ratio of 1:1 for sodium citrate-diethylenetriamine. The microstructure and crystallization by heat-treatment of NiB films mainly depended on boron content for the mixed system. Codeposited carbon in NiB films may also affect the microstructure and crystallization behavior.

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