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NHB不銹鋼縫隙腐蝕電化學測試的研究

  • 摘要: 本文結合研制耐海水腐蝕不銹鋼對不銹鋼縫隙腐蝕的電化學測試進行了研究。實驗結果表明,測量不銹鋼在人工縫隙條件下陽極極化循環曲線及電位Eb(縫)和Ep(縫)的方法,可用以表征不銹鋼在海水中的縫隙腐蝕敏感性。模擬縫隙腐蝕的活化—鈍化模擬電池方法,也可用于相對比較縫隙腐蝕的進行速度。應用上述方法測定了七種不銹鋼在3%氯化鈉水溶液中的縫隙腐蝕性能,其結果和實海掛片及室內浸泡加速試驗相一致。試驗證明,所研制的NHB-1不銹鋼(OOCr20Ni25Mo5)耐縫隙腐蝕性能遠優于316L不銹鋼。在NHB-1不銹鋼中如添加適量氮,尚可進一步提高其耐縫隙腐蝕性能。

     

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