黄銅の脱亜鉛腐食

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タイトル別名
  • Dezincification of Brass
  • オウドウ ノ ダツアエン フショク

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抄録

The observation with an optical microscope and an electron probe microanalyzer (EPMA) has been made on copper-zinc alloys electrochemically dezincified in a 3% NaCl aqueous solution and the Admiralty and Munty metal dezincified in practical use, respectively. In a groupe of α-brasses, the alloys of low zinc content are easily dezincified at the less noble potentials. In a two-phase brass, β-phase were dezincified more rapidly than α-brass, but the depth and morphology of the dezincified layer were independent of the potentiostatically applied potential. Measuring with EPMA, the Zn Kα radiation was not detected in the dezincified α-brass. On the other hand, in the two-phase brass the dezincified β phase grains emitted the Zn Kα radiation. The dezincification seems to start from the grain boundary and propagate into the inside of the grain. The Zn Kα radiation appears to be emitted from accumulated corrosion products of zinc near dissolution sites. Because of the presence of a surface films, the potential at the metal-solution interface may be less noble than the applied potential. At that potential, brass dissolve in the solution and the copper ions in the solution deposit on the brass surface.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 30 (8), 770-775, 1966

    公益社団法人 日本金属学会

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