2205双相不锈钢焊接接头在模拟海水中的腐蚀行为  

Corrosion Behavior of 2205 Duplex Stainless Steel Welded Joint in Simulated Seawater

作　　者：彭杏娜 乔亚霞 高仕龙 杨勇 PENG Xingna;QIAO Yaxia;GAO Shilong;YANG Yong(China Electric Power Research Institute,Beijing 100055,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China)

机构地区：[1]中国电力科学研究院有限公司,北京100055 [2]国网经济技术研究院有限公司,北京102209

出　　处：《腐蚀与防护》2024年第10期57-64,共8页Corrosion & Protection

基　　金：国家电网公司科技项目(5200-2356142A-1-1-ZN)。

摘　　要：利用X射线衍射仪(XRD)及背散射电子衍射(EBSD)分析了2205双相不锈钢焊接接头不同区域的物相及微观组织;采用电化学测试和X射线光电子能谱仪(XPS),探究了该焊接接头不同区域在模拟海上柔直平台冷却系统中的腐蚀行为。结果表明,焊接接头热影响区(HAZ)的动电位极化曲线中的钝化电流密度均小于母材和焊缝位置,HAZ阻抗弧半径最大且开路电位最高,HAZ的耐蚀性最好;XPS结果显示在该环境中2205双相不锈钢钝化膜以金属氢氧化物与氧化物为主。The phase and microstructure of different areas of 2205 duplex stainless steel welded joints were analyzed using Xray diffractometer(XRD)and electron back scatter diffraction(EBSD).The corrosion behavior of different areas of the welded joint in a simulated offshore flexible platform cooling system was studied using electrochemical tests and X-ray photoelectron spectroscopy(XPS).The results show that the passivation current density in the potentiodynamic polarization curve of the heat-affected zone(HAZ)of the welded joint was smaller than that of the base metal and weld seam.The HAZ had the largest impedance arc radius and the highest open circuit potential,and the HAZ had the best corrosion resistance;XPS results show that the passivation film of 2205 duplex stainless steel in this environment was dominated by metal hydroxides and oxides.

关 键 词：2205双相不锈钢 海上柔直平台冷却系统 电化学 腐蚀 钝化膜 

分 类 号：TG174.4[金属学及工艺—金属表面处理]