Corrosion behavior and mechanism of 3Cr steel in CO2 environment with various Ca2+ concentration

被引：25
作者：
Wang, Bei [1 ]
Xu, Lining [1 ]
Liu, Guozhang [1 ]
Lu, Minxu [1 ]
机构：
[1] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Corros & Protect Ctr, Key Lab Environm Fracture MOE, Beijing 100083, Peoples R China
来源：
CORROSION SCIENCE | 2018年 / 136卷
关键词：
Low alloy steel; Weight loss; Polarization; Acid corrosion; Passivity; IRON-CHROMIUM-ALLOYS; ELECTRODE IMPEDANCES; INTERNAL CORROSION; ANODIC-DISSOLUTION; PIPELINE STEEL; GAS-PIPELINES; CALCIUM-IONS; CARBON-STEEL; PRESSURE; TEMPERATURE;
D O I：
10.1016/j.corsci.2018.03.013
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of Ca2+ on the corrosion behavior of 3Cr steel was investigated using immersion tests and electrochemical measurements. The results demonstrated that with an increase in Ca2+ concentration in the solution, the corrosion rate of 3Cr steel decreased and the Ca2+ content in the corrosion scale increased. Ca is involved in the formation of both the inner and outer corrosion scales of 3Cr steel. Polarization curves revealed that Ca2+ could enhance the pseudopassivation of 3Cr steel. EIS results demonstrated that Ca2+ can decrease the porosity of corrosion films. Additionally, Ca2+ could accelerate the precipitation of FeCO3 (CaxFe1-xCO3) by reducing its solubility and saturation degree.
引用
收藏
页码：210 / 220
页数：11
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