S450EW焊接接头在NaHSO_3溶液中的腐蚀行为研究  

Corrosion Behavior of Weld Joint of S450EW Steel in NaHSO_3 Solution

作　　者：王军[1] 冯超 彭碧草 谢亿 张明华 吴堂清 

机构地区：[1]国网湖南电力公司电力科学研究院,长沙410007 [2]湖南省湘电锅炉压力容器检测中心有限公司,长沙410007 [3]湘潭大学材料科学与工程学院,湘潭411105

出　　处：《中国腐蚀与防护学报》2017年第6期575-582,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51601164和51471176);中国博士后科学基金(2017M622594)~~

摘　　要：采用熔化极富氩气体保护焊进行S450EW同种金属焊接,并利用电化学测试研究了焊接接头不同区域的耐蚀性能。结果表明,S450EW焊接接头母材区和焊缝区显微组织均为粒状贝氏体,热影响区为铁素体和珠光体的混合组织。焊缝区主要发生均匀腐蚀,但母材区和热影响区以局部腐蚀为主,而且热影响区腐蚀程度更深。焊丝中较高的Ni含量使得焊缝区抗大气腐蚀性能较好,而热影响区铁素体和珠光体两相组织导致其腐蚀速率较高。The weld joint of S450EW steel was prepared by metal active gas arc（MAG） welding.The corrosion behavior of different zones of the welded joint was studied via electrochemical test and scanning electron microscope（SEM）.The results showed that the microstructures were mainly composed of granular bainite of the base metal zone and weld zone,while the microstructure of the heat affected zone was composed of a mixture of ferrite and pearlite.Uniform corrosion was the typical corrosion pattern in the weld zone,and local corrosion occurred in the base metal zone and heat affected zone.Besides,severer local corrosion was observed in the heat affected zone.The better corrosion resistance of the weld zone may ascribed to the effect of high Ni content of the welding rod,while the high corrosion rate of the heat affected zone may be due to the dual phase microstructure of ferrite and pearlite.

关 键 词：S450EW钢 焊接接头 大气腐蚀 电化学阻抗谱 

分 类 号：TG172.4[金属学及工艺—金属表面处理]