表面状态对X80管线钢腐蚀行为的影响  

Effect of surface state on corrosion behavior of X80 pipeline steel

作　　者：陈丽娟[1,2] 徐向红[1] 魏博[1,2] CHEN Lijuan;XU Xianghong;WEI Bo(School of Chemical Engineering,Xinjiang University,Urumqi 830046,China;Xinjiang Key Laboratory of Cleaner Transition of Coal&Chemical Process,Xinjiang University,Urumqi 830046,China)

机构地区：[1]新疆大学化工学院,乌鲁木齐830046 [2]新疆大学煤炭清洁转化与化工过程自治区重点实验室,乌鲁木齐830046

出　　处：《压力容器》2021年第1期23-30,共8页Pressure Vessel Technology

基　　金：国家自然科学基金项目(51966017);新疆维吾尔自治区2019教学改革项目(XJJG201911)。

摘　　要：采用线性极化测试、电化学阻抗谱和动电位极化等电化学测试技术并结合表面分析方法,研究了表面状态对X80管线钢在模拟土壤溶液(NS4)中的腐蚀行为影响。试验结果表明,随着表面粗糙度下降,其自然腐蚀电位向正向移动,腐蚀电流密度下降,即腐蚀速率减小;不同粗糙度的X80钢试样在NS4溶液中电化学阻抗谱表现为一个时间常数;随表面粗糙度的逐渐减小,电荷转移、电阻逐渐增大。微观形貌显示,试样表面腐蚀产物随着粗糙度的减小而逐渐减少。试样表面效应是引起不同粗糙度钢腐蚀差异的重要因素。Effect of surface state on the corrosion behavior of X80 pipeline steel in simulated soil solution(NS4)was investigated using the linear polarization,electrochemical impedance spectroscopy,potentiodynamic polarization and in combination with the surface analysis method.The test results show that with the decrease of surface roughness,the corrosion potential of the steel shifted toward the positive direction,and the corrosion current density,i.e.,corrosion rate,also decreased.The electrochemical impedance spectrum of X80 steel specimens with different roughness showed a time constant in NS4 solution.With the decrease of surface roughness,the charge transfer resistance increased gradually.The SEM results show that the amounts of corrosion products on the specimen surface decreased with the decrease of roughness.The surface effect is an important factor that causes the corrosion difference of the steel with different roughness.

关 键 词：X80管线钢 表面状态 电化学腐蚀 动电位极化 

分 类 号：TH49[机械工程—机械制造及自动化] TB302.2[一般工业技术—材料科学与工程]