摘要
油田集气管线输送介质成分复杂,尤其是当CO_(2)/H_(2)S/H_(2)O存在时,导致管线发生严重内腐蚀。在现场无损检测过程中,即使是不锈钢仍然存在微裂痕。因此本文通过腐蚀形貌、力学实验,研究了Q235A钢、Q345A钢、45#钢和3Cr13钢的腐蚀特性。结果表明,Q235A钢的腐蚀产物颗粒呈多边形,具有良好的交联特性,优于Q345A和45#钢;同时,3Cr13钢的腐蚀产物颗粒之间没有明显的边界,其中腐蚀产物中的Fe_(3)C和纳米尺度表面微裂纹的观察表明,3Cr13钢的腐蚀以晶间腐蚀为主。与其他三种金属相比,3Cr13钢的强度下降比例更大,尤其是屈服强度,下降比例达到73.02%。
The transmission medium composition of oil field gas collection pipeline is complex,especially in the presence of CO_(2)/H_(2)S/H_(2)O,which leads to serious internal corrosion in the pipeline.In the process of field nondestructive testing,even stainless steel still has micro cracks.In this paper,the corrosion characteristics of the four metals including Q235A steel,Q345A steel,45#steel and 3Cr13 steel were determined by corrosion morphology,mechanical and electrochemical experiments.The results showed that the corrosion product particles of Q235A steel were polygonal,showing a good cross-linking feature,which was better than that of Q345A and 45#steels.Meanwhile,there was no obvious boundary between corrosion product particles of 3Cr13 steel,the Fe_(3)C in the corrosion products and the observation of micro-cracks on the surface at nanometer scale indicated that the intergranular corrosion of 3Cr13 steel was dominated.Compared with the other three metals,the strength of 3Cr13 steel decreased by a larger proportion,especially the yield strength,which decreased by 73.02%.
作者
刘洪志
LIU Hong-zhi(College of Mianyang Flight,Civil Aviation Flight University of China,Mianyang Sichuan 621000,China)
出处
《辽宁化工》
CAS
2023年第6期825-828,共4页
Liaoning Chemical Industry
作者简介
刘洪志(1992-),男,助理工程师,硕士研究生,2017年毕业于中国石油大学(华东)油气田开发工程,从事航空油料储运工作。
