条形电阻探针电阻变化与腐蚀程度相关性的数值模拟  

Numerical Simulation of Correlation between Resistance Change and Corrosion Degree of Bar Resistance Probe

作　　者：张文亮 冯大成 董亮 姚知林 周昊[2] ZHANG Wenliang;FENG Dacheng;DONG Liang;YAO Zhilin;ZHOU Hao(Puguang Branch,SINOPEC Zhongyuan Oilfield,Dazhou 636156,China;Key Laboratory of Oil and Gas Storage and Transportation Technology,Changzhou University,Changzhou 213164,China)

机构地区：[1]中石化中原油田普光分公司,达州636156 [2]常州大学江苏省油气储运技术重点实验室,常州213164

出　　处：《腐蚀与防护》2020年第4期54-59,共6页Corrosion & Protection

基　　金：国家自然科学基金项目(51401017);2018年江苏省油气储运技术重点实验室开放课题;江苏省研究生实践计划(SJCX19_0671)。

摘　　要：采用数值模拟方法计算了不同尺寸及缺陷类型电阻探针的电阻变化和电阻(ER)理论等效腐蚀深度,研究它们与失重法等效腐蚀深度的相关性,并结合试验验证了数值模拟模型的合理性。结果表明:均匀腐蚀时,探针电阻随腐蚀深度的增加而线性增大,随着点蚀系数的增大而缓慢增大,即电阻探针能够表征均匀腐蚀但受到局部腐蚀的影响;在探针尺寸及缺陷类型不变的情况下,失重法等效腐蚀深度与ER理论等效腐蚀深度的相对偏差随点蚀系数的增大而增大。The resistance change of resistance probes with different sizes and corrosion defect types,and electrical resistance(ER)theory equivalent corrosion depth were calculated by numerical simulation method.Their correlation with the equivalent corrosion depth based on weight-loss method was studied.And the rationality of the numerical simulation model was verified with experiments.The results show that the resistance value of corrosion probe increased linearly with the increase of corrosion depth under uniform corrosion condition,and increased slowly with the increase of pitting coefficient,which indicated that ER probe could characterize uniform corrosion but was affected by localized corrosion.When the probe size and corrosion defect were constant,the relative deviation of the equivalent corrosion depths based on ER theory and weight loss method increased with the increase of pitting coefficient.

关 键 词：电阻探针 腐蚀 数值模拟 有限元 

分 类 号：TE988[石油与天然气工程—石油机械设备]