微量H2S对X65管线钢CO2腐蚀行为的影响
Effect of Trace Amount of H2S on CO2 Corrosion Behavior of X65 Pipeline Steel
摘 要
利用高温高压釜进行了X65管线钢静态条件下的腐蚀模拟试验,研究了微量H2S对CO2腐蚀的影响。采用扫描电镜(SEM)和 X射线衍射(XRD)等方法对腐蚀产物膜的形态和成分进行了表征，同时利用电化学方法对两种气氛下的腐蚀行为进行了研究。CO2-H2S的主要腐蚀产物马基诺矿(FeS1-x)对基体的保护作用显著高于FeCO3。FeS1-x的溶度积显著小于FeCO3的溶度积，而更易于在钢表面形成保护性更好的腐蚀产物膜; CO2-H2S条件下铁硫化物FeS1-x的低溶度积是导致其腐蚀速率相对CO2条件下显著降低的根本原因。
CO2-H2S腐蚀
X65钢
CO2 corrosion
CO2-H2S corrosion
X65 steel
Abstract
Corrosion experiments of X65 steel under static condition were performed using high temperature and high pressure autoclaves to study the effect of trace amount of H2S on CO2 corrosion behavior. Corrosion morphology and corrosion scale were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. Electrochemical method was also used to investigate the corrosion behavior of X65 steel. Mackinawite (FeS1-x), the main corrosion product in CO2-H2S environments, had higher property to protect the metal matrix than FeCO3. Mackinawite with smaller solubility product in comparison with FeCO3 was more prone to precipitate on the metal surface to form compact corrosion scale with high protective property, which was the fundamental reason for the difference of corrosion rates between CO2 and CO2-H2S corrosion.
中图分类号 TG172
所属栏目 试验研究
基金项目
收稿日期 2013/10/23
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备注武玉梁(1987-)，硕士，工程师，从事油气长输管道工程设计工作,
引用该论文: WU Yu-liang,ZHANG Jin-yuan,YUAN Lin,CHEN Ying-shuai,WANG Li-jing. Effect of Trace Amount of H2S on CO2 Corrosion Behavior of X65 Pipeline Steel[J]. Corrosion & Protection, 2014, 35(8): 792
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