高频感应焊接黄铜管在海水中的腐蚀机理分析  

Analysis of corrosion mechanism of high-frequency induction welded brass pipe in seawater

作　　者：周雷 蔡琰 张炎雨 吴栅 谢志雄[1,2] 董仕节 解剑英[4] ZHOU Lei;CAI Yan;ZHANG Yan-yu;WU Shan;XIE Zhi-xiong;DONG Shi-jie;XIE Jian-ying(Hubei Key Laboratory of Green Light Industrial Materials,Hubei University of Technology,Wuhan 430068,China;Hubei Longzhong Laboratory,Xiangyang 441022,China;School of Mechanical Engineering,Wuhan Polytechnic University,Wuhan 430023,China;Taizhou Sanfu New Material Tech.Co Ltd,Taizhou 317200,China)

机构地区：[1]湖北工业大学绿色轻工材料湖北省重点实验室,湖北武汉430068 [2]湖北隆中实验室,湖北襄阳441022 [3]武汉轻工大学机械工程学院,湖北武汉430023 [4]台州三孚新材料科技股份有限公司,浙江台州317200

出　　处：《材料热处理学报》2024年第11期234-242,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51771071);湖北省国际科技合作项目(2022EHB020);湖北隆中实验室自主创新项目(2022ZZ-17)。

摘　　要：对高频感应焊接H65黄铜管进行海水浸泡实验,测量了不同浸泡时间后黄铜焊管的质量变化率,利用体式显微镜、扫描电镜(SEM)、电子探针(EPMA)、电子背散射衍射(EBSD)技术以及X射线光电子能谱(XPS)对焊缝浸泡腐蚀后的微观形貌和元素分布进行分析,利用电化学工作站对焊接接头进行电化学性能测试。结果表明:随着浸泡时间的延长,含有焊缝试样与母材的质量变化率之差逐渐增大;腐蚀产物主要有CuO、Cu(OH)_(2)、Cu_(2)O、CuCl、ZnO和Zn(OH)_(2)等,H65黄铜在海水中的腐蚀机理为“溶解-再沉积”机制;电化学腐蚀的结果表明,焊接接头的耐蚀性低于母材,这是由于焊缝晶粒产生了严重的塑性变形,导致焊接接头的位错密度和内应力大,能量较高。A seawater immersion experiment was conducted on high-frequency induction welded H65 brass pipes,and the mass change fraction of brass welded pipes after immersion for different time was measured.The microstructure and element distribution of the welded joints after immersion corrosion were analyzed using a stereomicroscope,scanning electron microscopy(SEM),electron probe microanalysis(EPMA),electron backscatter diffraction(EBSD)technique and X-ray photoelectron spectroscopy(XPS).The electrochemical performance of the welded joints was tested using an electrochemical workstation.The results show that as the immersion time increases,the difference in mass change fraction between the welded joint specimens and the base metal gradually increases.The corrosion products mainly include CuO,Cu(OH)_(2),Cu_(2)O,CuCl,ZnO and Zn(OH)_(2).The corrosion mechanism of the H65 brass in seawater is a“dissolution-redeposition”mechanism.The results of electrochemical corrosion show that the corrosion resistance of the welded joint is lower than that of the base material,which is due to severe plastic deformation of the weld grain,resulting in high dislocation density and internal stress,as well as high energy in the welded joint.

关 键 词：高频感应焊接 H65黄铜 浸泡腐蚀实验 耐蚀性 

分 类 号：TG456.9[金属学及工艺—焊接]