用于环境腐蚀监测的挂片型电阻探针研究.docVIP

  用于环境腐蚀监测的挂片型电阻探针研究# 张海娇1，冯蓓1,2，翁永基2,3，李相怡2,3，李俊豪2，焦正1** （1. 上海大学环境与化学工程学院，上海 200444； 5 10 15 20 25 30 35 40 2. 上海中涌防腐蚀技术公司， 上海 201807； 3. 中国石油大学（北京）理学院，北京 102200） 摘要：设计了一种含 4 个试片的电阻探针（ER），2 片暴露在腐蚀环境，2 片密封在环氧树 脂作为对照组，用于快速分析环境平均腐蚀速度和偏差。为消除温度对测量影响，引入腐蚀 指数 P 概念，根据 P-t 曲线计算特定时段的平均腐蚀速度；根据 P-Rx（腐蚀电阻）曲线确定 探针检测厚度变化的灵敏度。讨论了引线电阻和点蚀系数对测量结果的影响。对 2 个对照电 阻比值作了统计分析，以便确定异常波动性，作为探针密封性损坏的报警。通过和失重试验 对照，表明这种电阻探针能提供十分相近的结果，可用于环境腐蚀性的快速评定。 关键词：电阻探针；环境腐蚀性；碳钢挂片 中图分类号：TG172.4 A Novel Coupon-type Electrical Resistance Probe For Environmental Corrosion Monitoring? Zhang Haijiao1, Feng Bei1,2, Wen Yongji2,3, Li Xiangyi2,3, Li Junhao2, Jiao Zheng1 (1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China; 2. Shanghai Zhongyong Anticorrosion Technology Co. Lid, Shanghai 201807，China; 3. College of Science, China University of Petroleum Beijing, Beijing 102200，China) Abstract: A novel electrical resistance(ER) probe was designed in this paper, including 4 coupons, 2 of them exposed in corrosion environment and 2 sealed in epoxy for monitoring the environmental corrosion rates and deviations. P as corrosion index,was introduced for elimination of temperature influence. The mean corrosion rates within individual periods of time were calculated based on the P-t curves and the probe’s sensitivity in thickness were determined based on the P-Rx (corroded coupon’s resistance) curves. In addition, the influences of output line resistance and the pitting factors on the measure errors were investigated. The ratios of two contrast resistances were analyzed by statistical method to determine the unusual fluctuation and used as an index for sealing damage alarm. It was proved by contract with weightlessness experiments that this kind of ER probes could offer the approximately consistent results for quick estimation of environmental corrosivity. Key words: Electrical Resistance (ER) Probe; Environmental corrosivity; Carbon Steel Coupon 0 引言 环境腐蚀性常以特定金属腐蚀速度为衡量指标。依据 Q