溶液pH和温度对X65管线钢焊缝非均匀腐蚀的影响  

The Influence of Solution pH and Temperature on the Non-uniform Corrosion of X65 Pipeline Weldment

作　　者：朱烨森 刘梁 徐云泽[1] 王晓娜[3] 刘刚[1] 黄一[1] ZHU Yesen;LIU Liang;XU Yunze;WANG Xiaona;LIU Gang;HUANG Yi(School of Naval Architecture and Ocean Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;Power China Huadong Engineering Corporation Limited,Hangzhou 311122,China;School of Physic and Optoelectronic Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学船舶工程学院,辽宁大连116024 [2]中国电建集团华东勘测设计研究院有限公司,杭州311122 [3]大连理工大学物理学院,辽宁大连116024

出　　处：《材料导报》2022年第1期150-156,共7页Materials Reports

基　　金：中央高校基本科研业务费专项资金(DUT21RC(3)093);国家自然科学基金(52001055)。

摘　　要：本工作利用阵列多环组腐蚀监测传感器对X65管线钢焊缝在不同溶液pH和温度的饱和二氧化碳溶液中的非均匀腐蚀行为进行了研究。实验结果表明,管线钢焊缝的360°全周向区域以及沿管长轴向区域的非均匀腐蚀情况可以被有效监测。结合电化学测试及腐蚀形貌表征发现,在溶液pH为5.85时,管线钢焊缝表面难以形成具有保护性的腐蚀产物膜,随着溶液温度升高,焊缝三个区域(母材区、热影响区和焊缝区)的二氧化碳腐蚀加剧,其中焊缝区腐蚀最为严重;在溶液pH为6.86时,随着溶液温度升高,焊缝三个区域的腐蚀速率由于保护性腐蚀产物膜的形成而降低。魏氏体和针状铁素体在焊缝区的富集,导致焊缝区的成膜时间滞后于母材区和热影响区。In this work,the non-uninform corrosion behaviors of X65 pipeline weldments in the saturated CO_(2) solutions of different solution pH and temperature were studied using a multi-ring array corrosion monitoring sensor.The result shows that both the non-uniform corrosion of the pipeline weldment with the 360°full circumference and along the pipe-length axis could be effectively monitored.Combining the electrochemical test and corrosion morphology characterization,it can be seen that when the pH of the solution was 5.85,the protective corrosion product film was difficult to form on the surface,CO_(2) corrosion of all three welding areas(base metal,heat affected zone and welding metal)aggravated with the increase of temperature,and the corrosion of the welding metal was the most severe.When the pH of the solution was 6.86,the protective corrosion product layer would form on all three welding areas which could slow down the corrosion rate with the increase of temperature.Due to the enrichment of widmanstatten ferrite and acicular ferrite in the welding metal,the film formation time of the welding metal would lag behind the base metal and the heat affected zone.

关 键 词：阵列多环组腐蚀监测传感器 管线钢焊缝 二氧化碳腐蚀 非均匀腐蚀 

分 类 号：TG406[金属学及工艺—焊接]