鉛フリー快削性銅合金“75.5Cu-3Si-0.1P-Zn”の金属組織と耐脱亜鉛腐食性

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タイトル別名
  • Dezincification Corrosion Resistance and Microstructure of Lead-Free Free-Cutting Copper Alloy “75.5Cu-3Si-0.1P-Zn”
  • ナマリ フリーカイサクセイ ドウ ゴウキン 75 5Cu 3Si 0 1P Zn ノ キンゾク ソシキ ト タイダツアエン フショクセイ
  • Dezincification Corrosion Resistance and Microstructure of Lead-Free Free-Cutting Copper Alloy “75.5Cu-3Si-0.1P-Zn”

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抄録

We have developed a free-cutting copper alloy “75.5Cu-3Si-0.1P-Zn” free of lead which is known to be harmful to the human body. The microstructure of this developed alloy consists of α, κ and γ phases. The two hard κ and γ phases act as a source of stress at the time of cutting. As a result, the 75.5Cu-3Si-0.1P-Zn alloy is obtained in finely segmented chips with low cutting resistance. Incidentally, for plumbing fixtures such as cocks, vessels, valves, and joints related to the daily intake of tap water, copper alloys containing 2∼6 mass% lead are used. A switch to a lead-free material in the water supply system is urgently required. At the same time, accidents due to dezincification corrosion associated with water quality are frequently encountered in Japan, and there is a strong demand for materials with excellent dezincification corrosion resistance. In this study, we investigated the microstructure and dezincification corrosion resistance of the developed alloy by the ISO 6509 test method.<BR>Single-phase alloys of α, κ and γ phases were prepared by laboratory methods and their dezincification corrosion was evaluated. The α phase and κ phase each has excellent dezincification corrosion resistance and the γ phase also has good dezincification corrosion resistance. Therefore, the developed alloy consisting of these phases is believed to have excellent dezincification corrosion resistance.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 67 (5), 219-225, 2003

    公益社団法人 日本金属学会

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