Cr5Mo异种钢焊接熔合区H_2S腐蚀过程的原位观察  

IN SITU OBSERVATIONS FOR CORROSION PROCESS AT FUSION BOUNDARY OF Cr5Mo DISSIMILAR STEEL WELDED JOINTS IN H_2S CONTAINING SOLUTION

作　　者：邹杨[1] 潘春旭[1] 傅强[1] 陈超[1] 

机构地区：[1]武汉大学物理科学与技术学院,武汉430072

出　　处：《金属学报》2005年第4期421-426,共6页Acta Metallurgica Sinica

基　　金：石油科技中青年创新基金项目2002CX05教育部全国优秀博士学位论文作者专项资金项目200233资助

摘　　要：将经不同条件处理后的Cr5Mo+A302异种焊接接头放入NACE(TM-01-77)+H2S标准溶液中进行不同时间的 腐蚀性研究,在扫描电镜(SEM)下逐次原位跟踪观察熔合区同一部位经不同腐蚀时间后的变化过程.研究结果表明: (1)与其 它特征区相比,熔合区的耐腐蚀性能最差,产生"氢致剥离开裂"; (2)经过焊后热处理的熔合区的抗腐蚀性进一步降低; (3)宽 熔合区具有较强的抗"剥离开裂"腐蚀能力.上述现象与熔合区组织不均匀、碳迁移、氢富集和应力集中等因素有关.The corrosion behaviours of the welded joints between steels Cr5Mo and A302 (Cr25Ni13) in the H2S containing solution (NACE TM-01-77 standard) were studied. In situ SEM observations revealed that compared with other zones the fusion boundary is the worst region for corrosion resistance due to the hydrogen induced disbonding, the corrosion resistance of the post-weld heat-treated joint is worse than that of the as-welded one and the fusion boundary with a broad scale has a stronger resistance for the hydrogen induced disbonding than the narrow one. These variations are related to the inhomogeneous microstructures, carbon diffusion, hydrogen-enrichment and stress concentration around the fusion boundary.

关 键 词：CR5MO 异种钢焊接 熔合区 H2S腐蚀 焊后热处理 

分 类 号：TG172[金属学及工艺—金属表面处理] TG406[金属学及工艺—金属学]