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采用高压釜研究了16Mn钢在含有CO2与CO2+H2S介质的NACE(5wt%NaCl+0.5wt%CH3COOH)溶液中的高温高压腐蚀行为,利用失重法计算了腐蚀速率,通过SEM,XRD,EPMA等手段分析了腐蚀产物的成分及结构。结果表明:CO2腐蚀产物主要为Fe3C;CO2+H2S腐蚀产物主要为FeS,60℃时有FeCO3形成,腐蚀主要显示以CO2腐蚀为主的点蚀特征,90~120℃时,腐蚀系统以H2S腐蚀为主导,腐蚀产生的鼓泡、阶梯状裂纹是CO2与H2S协同作用的结果,CO2会增大H2S腐蚀的敏感性,使腐蚀产生氢损伤的温度提高。
The autoclave was used to study the corrosion behavior of 16Mn steel in NACE (5wt% NaCl + 0.5wt% CH3COOH) solution containing CO2 and CO2 + H2S. The corrosion rate was calculated by weight loss method. SEM, XRD and EPMA Means analysis of the composition and structure of the corrosion products. The results show that the main products of CO2 corrosion are Fe3C, the main products of CO2 + H2S corrosion are FeS, and FeCO3 is formed at 60 ℃. The corrosion mainly shows pitting corrosion characterized by CO2 corrosion. At 90-120 ℃, the corrosion system is H2S corrosion As a result, the bubbling and step-like cracks generated by corrosion are the result of synergistic effect of CO2 and H2S. CO2 will increase the sensitivity of H2S corrosion and raise the temperature of hydrogen damage caused by corrosion.