Formation of protective surface films on carbon steel in mildly alkaline aqueous alkanolamine CO2 solutions

被引：4
|
作者：
Sadeek, Samara A. [1 ]
Bedoya-Lora, Franky E. [2 ]
Campbell, Kyra Sedransk [3 ]
Kelsall, Geoff H. [1 ]
Hankin, Anna [1 ]
机构：
[1] Imperial Coll London, Dept Chem Engn, South Kensington Campus, London SW7 2AZ, England
[2] Univ Antioquia, Ctr Invest Innovac & Desarrollo Mat CIDEMAT, Cr 53 61-30,Torre 2,Lab 330, Medellin, Colombia
[3] Univ Sheffield, Dept Chem & Biol Engn, Mappin St, Sheffield S1 3JD, England
来源：
CORROSION SCIENCE | 2023年 / 211卷
基金：
英国工程与自然科学研究理事会;
关键词：
Iron carbonate; CO; 2; capture; Electrochemical impedance spectroscopy; Methyldiethanolamine; Corrosion protection; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; CORROSION PROTECTION; DIELECTRIC-CONSTANT; FORMATION KINETICS; SCALE FORMATION; CAPTURE;
D O I：
10.1016/j.corsci.2022.110859
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Electrochemical impedance spectroscopy (EIS) and open circuit potential (OCP) measurements, complemented by solution speciation predictions and ex situ surface analyses, were used to investigate film formation on carbon steel in CO2 saturated methyldiethanolamine(aq) solutions at 80 degrees C, pH 7.9-8.6. Pure FeCO3 films, evidenced by OCPs of ca. -0.5 to -0.4 V (SHE), were formed under anoxic conditions and provided corrosion protection to the underlying substrate, increasing charge transfer resistances tenfold. O2 ingress caused a positive OCP shift to ca. > +0.35 V (SHE), resulting in formation of traces of iron oxide at the interface, which was less protective.
引用
收藏
页数：12
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