首先对FV520（B）钢进行焊接，之后对母材及焊接接头进行不同工艺的热处理，然后将它们浸泡在质量分数为10%的H₂SO₄溶液中进行腐蚀试验，研究了热处理工艺对焊接接头耐蚀性能的影响。结果表明：不同热处理后的FV520（B）钢焊接接头的表面腐蚀形貌都较为均匀平整，但在熔合区附近存在较深的断层，且有深陷的沟壑状腐蚀坑；在相同的热处理条件下，母材的腐蚀速率均高于焊接接头的；在固溶处理与时效处理工序间增加调整处理工序可以提高焊接接头和母材的耐蚀性能；在850℃进行调整处理后焊接接头的表面腐蚀形貌要比在750℃进行调整处理的更均匀平整。

Welding experiment was carried out on FV520(B) steels, and then different heat treatments were carried out on base metal and welded joint. Then corrosion experiments of base metal and welded joint were executed in 10wt% H₂SO₄ solution to study the effects of heat treatment processes on corrosion resistance of welded joint. The results show that, after different heat treatments, the surface corrosion morphology of FV520(B) steel welded joint was relatively uniform, but deep fault and ravined corrosion pits were found near the fusion zone. Under the same heat treatment conditions, the corrosion rate of base metal was higher than that of the welded joint. The corrosion resistance of welded joint and base metal could be improved through adding intermediate treatment between solid solution and aging processes. After intermediate treatment at 850℃, the welded joint owned more uniform surface morphology than the welded joint after intermediate treatment at 750℃.