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材料工程  2010 

Cr含量和组织对含1%Cr管线钢焊接接头抗CO2腐蚀性能影响

, PP. 82-86

Keywords: 管线钢,焊接接头,CO2腐蚀,Cr含量,组织

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Abstract:

采用高温高压反应釜和电化学技术对含1%(质量分数)Cr管线钢焊接接头的CO2腐蚀行为进行研究,目的在于揭示Cr含量和组织对焊接接头抗CO2性能的影响。结果表明,Cr含量较高的焊缝区,腐蚀产物膜出现Cr元素富集,膜较其他区域更厚更致密,抗CO2腐蚀性能更佳。而Cr含量相同、组织不同的热影响区和母材,腐蚀产物膜特征相似。对于含1%Cr管线钢焊接接头,抗CO2腐蚀性能起主要作用的是Cr含量而非组织。电化学测试表明,在CO2腐蚀介质中焊接接头的母材区域易作为阳极首先发生腐蚀,焊缝和热影响区作为阴极得到保护。

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