摘要
探究了CO_(2)湿气环境中P110SS抗硫钢在不同温湿度下的S腐蚀特征及腐蚀机理。采用X射线光电子能谱(XPS)和扫描电子显微镜(SEM),对P110SS钢表面腐蚀产物膜的化学组成、微观形貌及厚度及去除腐蚀产物后基体的微观形貌进行了表征。结果表明:在60℃、相对湿度为30%的条件下,S不会参与腐蚀反应,但腐蚀环境中的Cl-和CO_(2)会导致抗硫钢发生局部腐蚀;当相对湿度升高至60%和90%时,S参与了腐蚀的阴极反应,生成FeS,并导致抗硫钢发生全面腐蚀。在80℃、相对湿度为30%的条件下,S也参与腐蚀的阴极反应,并导致抗硫钢发生了局部腐蚀;当相对湿度为60%和90%时,S会发生水解反应,产生H_(2)S和H_(2)SO_(4),使抗硫钢发生严重的全面腐蚀。另外,腐蚀产物膜的厚度随湿度的升高而增加,致密度随反应温度的升高而降低。研究结果能为抗硫钢的S腐蚀控制提供参考。
The characteristics and mechanisms of elemental sulfur induced corrosion of P110SS sul-fur-resistant steel in wet flow carbon dioxide atmosphere of various flux and relative humidity at different temperatures were investigated by means of X-ray photoelectron spectroscopy(XPS)and scanning elec-tron microscopy(SEM),in terms of the composition and morphology of the corrosion product and the sub-strate steel.The results show that the elemental sulfur does not corrode P110SS at 60℃in the wet flow CO_(2)with 30%relative humidity,however when the relative humidity reaches to 60%or higher,the ele-mental sulfur may participate in the cathodic reaction to generate S2-,which in turn combines with Fe2+to produce FeS.As the temperature reaches to 80℃,the elemental sulfur becomes more active and may react with the steel to form Fe S even in the flow CO_(2)with 30%relative humidity.When the relative humidity reaches to 60%or higher at 80℃,the elemental sulfur starts to hydrolyze,generating H_(2)SO_(4) and H_(2)S,which aggravates the corrosion of the steel.Furthermore,when the CO_(2)flux with high humidity at high tem-perature,Fe S will also catalyze the hydrolysis of the elemental sulfur to form more SO42-and S2-.Finally,the thickness of the corrosion product increases with the increasing humidity and the density of the corro-sion product decreases with the increasing temperature.Therefore,the findings of this study can provide a reference for the prevention and control of the elemental sulfur corrosion of sulfur-resistant steels.
作者
刘毅超
钟显康
扈俊颖
LIU Yichao;ZHONG Xiankang;HU Junying(School of Oil and Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610500,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2022年第3期369-377,共9页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金(52171080)
西南石油大学青年科技创新团队项目(2018CXTD01)。
关键词
湿气环境
S腐蚀
P110SS
腐蚀特征
腐蚀机理
humid environment
elemental sulfur corrosion
P110SS sulfur-resistant steel
corrosion characteristics
corrosion mechanisms
作者简介
刘毅超,男,1996年生,硕士生;通讯作者:钟显康,E-mail:zhongxk@yeah.net,研究方向为油气田防腐/防垢/解堵。
