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利用电化学测试和腐蚀失重法,结合微观腐蚀形貌观察以及成分分析,对比研究了不同组织A710钢在3.5%NaCl溶液中的耐蚀性。结果表明:A710钢焊接接头3个区域(即母材(BM)、热影响区(HAZ)和焊缝(WM))的组织存在明显差异,BM主要以铁素体为主,HAZ主要由铁素体和贝氏体组成,还含有大量M-A岛,而WM则主要为贝氏体组织及少量针状铁素体。WM在3.5%NaCl溶液中的电化学活性最高,平均腐蚀速率最大。浸泡16 d后,其腐蚀产物疏松,保护性差,基体上产生较多、较深的蚀坑。BM和HAZ的腐蚀产物较致密,保护性好,基体的腐蚀较均匀和轻微。
The corrosion resistance of A710 steel in 3.5% NaCl solution was compared with the results of electrochemical test and corrosion weight loss method, microscopic corrosion morphology observation and composition analysis. The results show that there are obvious differences in the microstructure of the welded joints of A710 steel (BM, HAZ and WM). BM mainly consists of ferrite and HAZ mainly consists of iron Body and bainite, also contains a large number of MA Island, while WM is mainly bainite and a small amount of acicular ferrite. WM in 3.5% NaCl solution electrochemical activity of the highest average corrosion rate of the largest. After soaking for 16 days, the corrosion products were loose and poorly protected, and more and deeper pits were formed on the substrate. The corrosion products of BM and HAZ are denser, more protective and the corrosion of the substrate is more uniform and slight.