X65管线钢在盐溶液中的腐蚀监测技术  

Corrosion Monitoring Techniques of X65 Pipeline Steel in Brine Solution

作　　者：李小龙 谭珮琮[1] 黄一[2] 

机构地区：[1]中海石油深海开发有限公司,珠海519000 [2]大连理工大学船舶与海洋工程学院,大连116024

出　　处：《腐蚀与防护》2017年第2期113-118,共6页Corrosion & Protection

基　　金：国家科技重大专项(2011ZX05056)

摘　　要：通过特殊设计的电子试片,分别利用电阻法(ER)和电化学方法对同一个X65管线钢试片在3.5%(质量分数)NaCl溶液中的腐蚀速率进行了50d的在线监测,并将在线监测结果与失重法的测量结果进行了对比。结果表明:随着腐蚀的进行,逐渐生成的锈层对X65管线钢的腐蚀有良好的抑制作用,腐蚀速率在30d后降至初始腐蚀速率的1/6;ER法测试时,测试初期由于试片表面不均匀腐蚀,导致其测量结果与失重法的测量结果存在较小的误差,在腐蚀进行20d后,二者具有良好的一致性;电化学方法在测试初期与ER法和失重法具有较好的一致性,但随着内锈层的发展,腐蚀在进行30d后,电化学方法的测试结果远高于试片真实的腐蚀速率,表明电化学方法不适用于海洋环境中的长期腐蚀监测。Through a special design of electronic coupons, on-line monitoring of corrosion rate for the same coupon of X65 steel in 3. 5% （mass fraction） NaCI solution for 50 d was carried out by electrical resistance （ER） and electrochemical methods. The measurement results by on-line monitoring were compared with those monitored by weight-loss method. The results show that the rust layer had an excellent inhibition for the corrosion of X65 steel. The corrosion rate reduced to 1/6 of the initial corrosion rate after 30 days. The ER monitoring results had a measurement error at the beginning due to the nonuniform corrosion on the specimen surface. The corrosion rates measured by ER technique and weight-loss method had a good accordance after corrosion for 20 days. The corrosion rate measured by electrochemical methods agreed with the other two kinds of methods during the initial period. However, after corrosion for 30 days, the electrochemical measurement results were much higher than the real corrosion rate of the specimen. It means that electrochemical methods are not applicable for long term corrosion monitoring in ocean surroundings.

关 键 词：电子试片 电阻法 腐蚀监测 X65钢 

分 类 号：TG172[金属学及工艺—金属表面处理]