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材料工程  2013 

Cr含量对X120级管线钢组织及耐酸性腐蚀性能的影响

DOI: 10.3969/j.issn.1001-4381.2013.09.007

Keywords: Cr含量,X120,CO2/H2S腐蚀,Cr富集,离子选择性

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Abstract:

运用SEM,TEM和失重法研究了Cr元素对X120级管线钢力学性能及耐CO2/H2S腐蚀性能的影响。力学性能结果表明四种实验钢显微组织均为回火马氏体,力学性能均达到API5L标准中X120级别,且随Cr含量增加,板条束数量增加,宽度变窄,使得屈服强度和抗拉强度逐渐增大;钢中析出物主要为(Nb,Ti)(C,N),当Cr含量达到3%(质量分数)时,析出物中发现极少量Cr。腐蚀实验结果表明在CO2/H2S环境下,四种钢腐蚀产物膜均分为两层,内层主要为CO2腐蚀产物FeCO3,外层是FeS;Cr主要存在于腐蚀产物膜的内层,且随钢中Cr含量的增加,Cr在内层腐蚀产物中的富集量加大;钢中的Cr元素使腐蚀产物膜变得致密且具有离子选择性,阻止腐蚀液中的阴离子到达基体,进而提高钢的耐CO2/H2S腐蚀性能。

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