Corrosion Performance of High Strength 15Cr Martensitic Stainless Steel in Severe Environments  

作　　者：Xiang-hong L Fu-xiang ZHANG Xiang-tong YANG Jun-feng XIE Guo-xian ZHAO Yan XUE 

机构地区：[1]School of Materials Science and Engineering,Xi'an Shiyou University [2]Petroleum Engineering Institute,Petrochina Tarim Oilfield Company [3]Xi'an Maurer Petroleum Engineering Laboratory,Co.,Ltd.

出　　处：《Journal of Iron and Steel Research International》2014年第8期774-780,共7页

基　　金：Item Sponsored by National Natural Science Foundation of China(51271146,51074126)

摘　　要：High pressure and high temperature corrosion performance of high strength 15 Cr martensitic stainless steel was studied in different severe environments—live acid（10%HCl＋1.5%HF＋3%HAc＋5.1% corrosion inhibitor）,spent acid and formation water containing CO2.The results show that the corrosion of high strength 15 Cr martensitic stainless steel in live acid is most serious,and the uniform corrosion rate is far greater than those in spent acid and formation water containing CO2 corrosion environments,but all of them can be acceptable for oilfield.Acidizing corrosion inhibitor displays a good matching ability with the high strength 15 Cr martensitic stainless steel in terms of decreasing the uniform corrosion rate,which changes mainly the anodic process of high strength 15 Cr martensitic stainless steel.The corrosion potential moves to the positive direction,thus the corrosion current density decreases significantly.There are some different degrees of pitting of high strength 15 Cr martensitic stainless steel after corrosion tests in live acid,spent acid and formation water containing CO2,and the pitting density aggravates significantly and the maximum pit depth decreases in the corrosion sequence.High pressure and high temperature corrosion performance of high strength 15 Cr martensitic stainless steel was studied in different severe environments—live acid（10%HCl＋1.5%HF＋3%HAc＋5.1% corrosion inhibitor）,spent acid and formation water containing CO2.The results show that the corrosion of high strength 15 Cr martensitic stainless steel in live acid is most serious,and the uniform corrosion rate is far greater than those in spent acid and formation water containing CO2 corrosion environments,but all of them can be acceptable for oilfield.Acidizing corrosion inhibitor displays a good matching ability with the high strength 15 Cr martensitic stainless steel in terms of decreasing the uniform corrosion rate,which changes mainly the anodic process of high strength 15 Cr martensitic stainless steel.The corrosion potential moves to the positive direction,thus the corrosion current density decreases significantly.There are some different degrees of pitting of high strength 15 Cr martensitic stainless steel after corrosion tests in live acid,spent acid and formation water containing CO2,and the pitting density aggravates significantly and the maximum pit depth decreases in the corrosion sequence.

关 键 词：high strength 15Cr martensitic stainless steel live acid spent acid CO2 corrosion 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG172.3[金属学及工艺—金属材料]