利用微区扫描电化学方法研究316L焊缝腐蚀及防护  

Study on Corrosion and Protection of 316L Weld by Micro-Area Scanning Electrochemical Method

作　　者：刘玉娥[1] 李爱贵 LIU Yu-e;LI Ai-gui(Research Institute of Petroleum Exploration and Development,Beijing 100083,China;CNPC Research Institute of Engineering Technology,Tianjin 300451,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油集团工程技术研究有限公司,天津300451

出　　处：《全面腐蚀控制》2021年第10期146-151,共6页Total Corrosion Control

摘　　要：316L不锈钢焊缝位置易发生腐蚀,利用M370扫描电化学工作站,测试了焊缝/热影响区/本体的电位分布,分析了焊缝位置的腐蚀原因。采用在ER316L焊材表面覆盖一层耐蚀性较316L优良的不锈钢作为盖面材料的方法对焊缝进行防护,利用M370扫描电化学工作站对焊缝试样的不同部位(焊缝/热影响区/本体)电位差进行了测试,测试结果表明:热影响区电位最低,为腐蚀易发生位置;几种盖面层中,ER385盖面层耐蚀性最好;选择盖面层,还需考虑电金属之间的电位差,避免盖面层与316L的基体发生电偶腐蚀。The weld position of 316L stainless steel is prone to corrosion.The potential distribution of weld/heat affected zone/body was tested by M370 scanning electrochemical workstation,and the corrosion cause of weld position was analyzed.The weld was protected by covering the surface of ER316L with a layer of stainless steel with excellent corrosion resistance than 316L as the cover material.The M370 scanning electrochemical workstation was used for different parts of the weld sample(weld/heat affected zone)./body)potential difference was tested.The test results showed that the potential in the heat-affected zone was the lowest,which was easy to occur in corrosion;in several kinds of capping layers,the ER385 capping layer had the best corrosion resistance.To select the cover layer,it was also necessary to consider the potential difference between the electrical metals to avoid galvanic corrosion of the cover layer and the 316L substrate.

关 键 词：316L不锈钢 焊缝腐蚀与防护 SVET微区扫描电化学 盖面层 

分 类 号：TE866[石油与天然气工程—油气储运工程]