不同焊接工艺下钢管焊接接头的CO2腐蚀行为研究

摘要

In this article, it adopted high temperature and high pressure reaction kettle and electrochemical technology to research CO2 corrosion behavior of steel pipe welded joints under two kinds of welding process (GTAW and GTAW+SMAW). The results indicated that the corrosion rate of welded joints with GTAW+SMAW welding process is lower than that of GTAW welding process; the corrosion rate of two kinds of welding process decreases with corrosion time increasing,the surface of corrosion product film becomes density;the cross section of corrosion product film becomes thicker and more closely. The main composition of corrosion products are (Fe, Ca) CO3 compound salt and Fe3O4.%采用高温高压反应釜和电化学技术对GTAW+SMAW和GTAW两种不同焊接工艺下焊接接头的CO2腐蚀行为进行了研究。结果表明， GTAW+SMAW工艺焊接接头的腐蚀速率小于GTAW工艺焊接接头；两种焊接工艺所得焊缝腐蚀速率均随腐蚀时间的增加而减小；腐蚀产物膜随时间的增加表面致密，横截面厚度增加且更为紧密；腐蚀产物的主要成分为(Fe,Ca)CO3复合盐和Fe3O4。