X70钢焊接接头在酸性溶液中的局部腐蚀SVET研究

摘要

采用SEM分析了符合焊接工艺规范的X70管线钢焊接接头部位的组织，并采用扫描振动参比电极技术（SVET）研究了X70钢焊接接头在鹰潭酸性土壤模拟溶液中的局部腐蚀行为。结果表明，X70钢焊接接头热影响区在鹰潭酸性土壤模拟溶液中的腐蚀电流密度最大，焊缝和母材靠近热影响区的区域电流密度次之，母材的腐蚀电流密度随着与热影响区距离的增大而降低。%The mophology of X70 pipeline steel weld jiont was investigated by SEM and its localized corrosion behaviors in Yingtan acid simulation solution were studied by scanning vibrating electrode technique (SVET). It is demonstrated that there was a higher corrosion current density on the surface of heat affected zone (HAZ) than on weld metal and base metal (BM). The current density of BM decreased with the increase of distance from HAZ.