Effect of Ca^(2+) on CO_2 corrosion properties of X65 pipeline steel  

作　　者：Chen Ding Ke-wei Gao Chang-feng Chen 

机构地区：[1]Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China [2]Department of Materials, China University of Petroleum, Beijing 100083, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2009年第6期661-666,共6页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.50571012)

摘　　要：The effect of Ca^2＋ on CO2 corrosion to X65 pipeline steel was investigated in the simulated stratum water of an oil field containing different concentrations of Ca^2＋. It is found that Ca^2＋ can enhance the corrosion rate, especially in the Ca^2＋ concentration from 256 to 512 mg/L, which can be attributed to the growing grain size and loosing structure of corrosion scales with increasing Ca^2＋ concentration. X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS） investigations reveal that a complex carbonate （Fe, Ca）CO3 forms at high Ca^2＋ concentration due to the gradual replacement of Fe^2＋ in FeCO3 by Ca^2＋.The effect of Ca^2＋ on CO2 corrosion to X65 pipeline steel was investigated in the simulated stratum water of an oil field containing different concentrations of Ca^2＋. It is found that Ca^2＋ can enhance the corrosion rate, especially in the Ca^2＋ concentration from 256 to 512 mg/L, which can be attributed to the growing grain size and loosing structure of corrosion scales with increasing Ca^2＋ concentration. X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS） investigations reveal that a complex carbonate （Fe, Ca）CO3 forms at high Ca^2＋ concentration due to the gradual replacement of Fe^2＋ in FeCO3 by Ca^2＋.

关 键 词：CO2 corrosion： pipeline steel stratum water Ca^2＋ concentration complex carbonate 

分 类 号：O484.1[理学—固体物理] TE973.3[理学—物理]