JIS H5120 (銅及び銅合金鋳物) 改正原案における新提案銅合金鋳物の耐食性

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  • Corrosion Resistance of New Copper Alloy Castings Proposed in Amendment Draft of JIS H5120 Copper Alloy Castings
  • JIS H5120(ドウ オヨビ ドウ ゴウキン イモノ)カイセイ ゲンアン ニ オケル シン テイアン ドウ ゴウキン イモノ ノ タイショクセイ

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<p>  Four kinds of dezincification corrosion resistance brass castings (JIS symbols CAC211, CAC221, CAC231, and CAC232) and two kinds of Bismuth bronze castings (JIS symbols CAC905 and CAC906) were suggested to Japanese Industrial Standards (JIS H2210, H5120 and H5121) as alloys applicable to tools related to water supply appliances. For the corrosion-resistant evaluation of these six new alloys (proposed new materials), dezincification-corrosion test (ISO 6509-1981), erosion-corrosion test (jet-in-slit test) and stress-corrosion-cracking test were carried out, and the results were compared with JIS copper alloys (CAC203, CAC804, CAC902, and C3771). The dezincification corrosion resistance of the proposed materials was better than CAC203 and equal to CAC804 and CAC902. In the erosion-corrosion test of the JIS copper alloys, CAC902 was excellent, followed by CAC804, C3771, and CAC203 (CAC902 >> CAC804 > C3771 > CAC203) in this order. Among the proposed alloys, CAC211, CAC231, CAC905, and CAC906 showed good erosion-corrosion resistance equal to CAC902. The erosion-corrosion resistance of CAC221 and CAC232 was worse than CAC902 and equal or slightly better than CAC804. In addition, it was revealed that the erosion-corrosion resistance improved when tin was contained. In the stress-corrosion-cracking test, the stress-corrosion-cracking sensitivity of the proposed materials was lower than C3771 and CAC203. </p>

収録刊行物

  • 鋳造工学

    鋳造工学 87 (12), 830-835, 2015

    公益社団法人 日本鋳造工学会

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