摘要
为弄清各因素下,原油输送管道在原油沉积水中的腐蚀机理,通过动电位扫描法和电化学阻抗谱分别研究了X60管线钢在模拟原油沉积水中的电化学行为,研究了Cl^-、HCO_3^-、SO_4^(2-)等的浓度对X60管线钢电化学行为的影响。结果表明:在试验浓度内,Cl^-浓度为25 000 mg/L时腐蚀速率最大,极化电阻最小,随着Cl^-浓度的继续增大,自腐蚀电流有所降低;随着HCO_3^-浓度的增大,自腐蚀电流密度先增大后减小,当HCO_3^-浓度为6 000 mg/L时,自腐蚀电流密度最大;SO_4^(2-)浓度的增大促进了X60管线钢在沉积水中的腐蚀。
The impact of Cl-, HC03, SO4 2- concentrations on the electrochemical behaviors of X60 pipeline steel in sedimentary water was stud- ied by electrochemical impedance spectroscopy and dynamic potential scanning methods. Results showed that in the scope of test concentration, when the Cl-concentration was 25 000 mg/L, the corrosion current density was the maximum and the polarization resistance was the minimum. The corrosion current density decreased with the increase of C1- concentration. The corrosion current density increased firstly and then decreased with the increase of HCO3 concentration. With HCO3 concentration of 6 000 mg/L, the corrosion current density reached the maximum. Be- sides, the increase of SO2- concentration could promote the corrosion of X60 in sedimentary water.
作者
方晓君
彭伟华
FANG Xiao-jun1, PENG Wei-hua2(1. Research Institute of Shaanxi Yanchang Petroleum （Group） Co., Ltd., Xi＇ an 710075, China ; 2. China Huanqiu Contracting ＆ Engineering Co., Ltd., Beijing Huanqiu Corporation, Beijing 100012, China)
出处
《材料保护》
CAS
CSCD
北大核心
2018年第2期56-60,72,共6页
Materials Protection
关键词
X60管线钢
离子浓度
原油沉积水
电化学行为
X60 pipeline steel
ion concentration
crude oil sedimentary water
electrochemical behavior
