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针对我国特定地质处置环境,采用浸泡方法研究了高放废物包装容器候选材料Q235低碳钢焊接接头在模拟地下水溶液中的缝隙腐蚀行为,考察了温度以及溶液中氧浓度的影响.利用OM观察了焊接接头不同区域的显微组织,利用SEM和表面轮廓仪分析了不同区域的腐蚀行为,并采用电化学方法测量了各个区域的开路电位.结果表明,升高温度和氧含量能够促进缝隙腐蚀过程,并对缝隙内外的腐蚀过程均有促进作用.熔合区组织为大量聚集的铁素体组织,腐蚀最严重,其次是具有粗大魏氏体组织的焊缝区,母材区和热影响区组织相对均匀细小,腐蚀相对较轻.
Aiming at the specific geological disposal environment in our country, the crevice corrosion behavior of Q235 low carbon steel welded joint in groundwater was investigated by immersion method, and the effects of temperature and oxygen concentration in solution were investigated. The corrosion behavior of different regions was analyzed by SEM and surface profiler, and the open circuit potential of each region was measured by electrochemical method.The results show that elevated temperature and oxygen content can promote the crevice corrosion process , And promote the corrosion process both inside and outside the gap.The fusion zone is a large amount of aggregated ferrite and has the most serious corrosion followed by the weld zone with coarse W and the base metal and the heat affected zone Relatively uniform and small, corrosion is relatively light.