论文部分内容阅读
采用高压釜模拟海底集输环境,通过电化学测试技术、浸泡实验、SEM和XRD技术研究了H2S浓度和pH值对X65钢焊接接头腐蚀行为的影响。结果表明,X65钢焊接接头中热影响区的开路电位最负,焊缝最正,母材介于两者之间,腐蚀电流密度从大到小的顺序为:热影响区>母材>焊缝;焊接接头平均腐蚀速率在0.1~0.25 mm/a之间,硫化物浓度增加、pH值降低均可导致腐蚀速率增加;X65钢海管焊接接头在模拟现场工况条件下以均匀腐蚀为主,焊缝区腐蚀程度低于热影响区。
The autoclave was used to simulate the seabed environment. The influences of H2S concentration and pH on the corrosion behavior of welded joint of X65 steel were studied by electrochemical test, immersion test, SEM and XRD. The results show that the open circuit potential of the heat-affected zone in X65 steel welded joint is the most negative, the weld is the most positive and the base metal is in between. The order of corrosion current density is as follows: heat affected zone> base metal> welding The average corrosion rate of welded joint is between 0.1-0.25 mm / a, the sulfide concentration increases and pH value decreases can lead to the increase of corrosion rate. X65 steel pipe welded joint is mainly under uniform field corrosion , Weld zone corrosion is lower than heat affected zone.