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    雙相鋼和鎳基合金腐蝕試驗(yàn)對(duì)比分析

    Comparative Analysis on Results from Corrosion Tests of Dual Phase Steel and Nickel-base Alloy

    • 摘要: 針對(duì)H2S、CO2、Cl-同時(shí)存在的高溫、高壓腐蝕環(huán)境,選擇22Cr、25Cr雙相不銹鋼和028鐵-鎳基合金、G-3鎳基合金進(jìn)行對(duì)比試驗(yàn),分析Cl-質(zhì)量濃度、溫度、液體流動(dòng)等因素對(duì)各種耐蝕合金管材發(fā)生均勻腐蝕與點(diǎn)蝕的腐蝕速率影響。結(jié)果表明:在Cl-質(zhì)量濃度小于120g/L時(shí),雙相鋼具有較好的耐腐蝕性能,可作為油管和油層套管廣泛使用;當(dāng)Cl-質(zhì)量濃度大于120g/L時(shí),鐵-鎳基合金與鎳基合金具有良好的耐腐蝕性能,此時(shí)雙相鋼僅可作為油管進(jìn)行有限壽命設(shè)計(jì)使用。

       

      Abstract: Addressing the hi-temperature and high-pressure corrosive service conditions involving the coexistence of H2S,CO2 and Cl-,comparative tests are conducted to the 22Cr and 25Cr dual phase stainless steels,and the 028 ferronickel-base alloy and G-3 nickel-base alloy.The elements like Cl-concentration,temperature and liquid mobility etc.which influence the velocity of general or spot corrosion of different anti-corrosion alloy tubular products are analyzed.The test results demonstrate that when Cl-mass concentration is less than 120 g/L,the dual phase steel possesses rather fine corrosion resistance,and can be widely used as the material to produce the tubing or the oil string casing,and when Cl-mass concentration is higher than 120 g/L,the ferronickel-base alloy or the nickel-base alloy possesses satisfactory corrosion resistance,whereas the dual phase steel can be only used to produce tubings with a limited service span as designed.

       

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