BHW35与20MnMo焊接接头腐蚀行为研究

An Investigation into Corrosion Behavior of 20MnMo And BHW35 Welded Joint

为了改善BHW35与20MnMo焊接接头的腐蚀行为,对异种金属焊接接头的腐蚀行为进行了研究。常温条件下,将焊接接头分别在不同pH值的NaOH或HCl酸碱溶液中腐蚀456h,观察金属组织,测试损失的质量。通过对焊接接头腐蚀前后金属组织、平均腐蚀速率对比得出:BHW35钢与20MnMo钢异种金属焊接接头在HCl酸溶液中的腐蚀最为严重;焊缝区金属的耐腐蚀性能优于热影响区和熔合区。

The corrosion behavior of the 20MnMo and BHW35 welded joint is studied.The welded joints are put in solutions with different pH value of the NaOH or HCl acid-basic to examine the corrosion behavior after 456 hours at room temperature condition,then the microstructure is examined and the weight loss of samples is measured before and after corrosion.The microstructure,weight loss and the corrosion rateof specimens under different conditions are compared.The following results are attained： the most serious corrosion of 20MnMo and steel BHW35 dissimilar joint happens in the hydrochloric acid solution.The corrosion resistance of the weld metal is better than that of the heat-affected zone and the fusion zone metals.