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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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低铬X65管线钢CO2腐蚀产物膜的特征及形成机制
, PP. 84-90
Keywords: 低铬X65钢,腐蚀产物膜,腐蚀速率,腐蚀形态,CO2腐蚀
Abstract:
利用高温高压CO2腐蚀模拟实验以及ESEM,EDS,XPS和SEM等分析技术,研究了4种不同含Cr量的X65管线钢的腐蚀速率、腐蚀形态和腐蚀产物膜结构特征.结果表明含Cr量高的钢平均腐蚀速率小,无Cr和含1\%Cr的钢的腐蚀形态为局部腐蚀,含3%和5%Cr的钢的腐蚀形态为全面腐蚀.在高温高压CO2腐蚀环境中,含Cr钢的腐蚀产物膜为FeCO3和Cr(OH)3竞争沉积形成的多层结构,其中1Cr-X65和3Cr-X65的腐蚀膜具有3层结构,5Cr-X65的腐蚀膜是双层结构.Cr在腐蚀产物膜层中出现局部富集,远高于基体中的Cr含量.高含Cr量使腐蚀产物膜中的Cr(OH)3含量高,并提高了腐蚀膜的保护性能,从而引起腐蚀形态发生转变,腐蚀速率降低.FeCO3和Cr(OH)3共沉积层膜对低铬钢的抗CO2腐蚀性能具有关键的影响.
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