中文摘要：

通过热模拟方法得到X60钢焊接热影响区组织，并对其微观组织进行分析，研究了母材及其热影响区在两种不同溶液中的自腐蚀电位、极化曲线和电化学阻抗谱．结果表明，当腐蚀介质使X60钢及其热影响区表面产生活性溶解时，热影响区的耐蚀性优于X60钢；当表面均生成腐蚀产物膜时，X60钢表面的产物膜保护性较好，使得耐蚀性优于其热影响区.

英文摘要：

The welding coarse grain heat-affected zone（CGHAZ） of X60 steel was obtained by heat simu- lation method. The microstructures of X60 steel and its CGHAZ were observed and analyzed, and their corrosion potential, potentiodynamic polarization curves and electrochemical impedance spectra were measured respectively. The results show that when the corrosion media made X60 steel and its CGHAZ dissolved actively, the corrosion resistance of CGHAZ was higher than that of X60 steel;when corrosion scale formed on the surface of X60 and its CGHAZ in another corrosion media, the corrosion resistance of X60 steel was higher than that of its CGHAZ due to higher protectiveness of its scale of corrosion products.