WC-Ni-Cr系超硬合金のNaOH溶液中での腐食挙動 Corrosion Behavior of WC-Ni-Cr Cemented Carbide in NaOH Solution

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WC-Ni-Cr cemented carbides have been used even under corrosive condition because of its excellent corrosion resistance. The corrosion characteristics of this alloy in acidic and neutral solution had been investigated by immersion test and polarization test, and reported that corrosion resistance was improved in the low carbon and high Cr<SUB>3</SUB>C<SUB>2</SUB> content alloy.<BR>In this report, these corrosion tests were carried out in 1N NaOH solution. In immersion test, most of the dissolved element in the solution was W. The corrosion rate of WC-Ni-Cr was the higher with the lower carbon and the lower Cr<SUB>3</SUB>C<SUB>2</SUB> contents, and these results were quite opposite to the tendency in acidic and neutral solutions. In polarization test, a large difference in polarization curves by the change of carbon content was not observed. The passivation region, which was observed in acidic solution, was not observed. In the vicinity of the corrosion potential, the corrosion current density (irorr) decreased with the increase in the carbon and Cr<SUB>3</SUB>C<SUB>2</SUB> contents. The difference of corrosion rate with carbon and Cr<SUB>3</SUB>C<SUB>2</SUB> contents of WC-Ni-Cr in 1N NaOH solution was considered to be caused by the difference in the amount of W dissolved in the binder Ni phase.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 46(4), 402-408, 1999-04-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002262316
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    4701611
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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