A mechanistic model for pipeline steel corrosion in supercritical CO2-SO2-O2-H2O environments

被引：42
作者：
Xiang, Yong [1 ]
Wang, Zhe [1 ]
Xu, Minghe [1 ]
Li, Zheng [1 ]
Ni, Weidou [1 ]
机构：
[1] Tsinghua Univ, Dept Thermal Engn, State Key Lab Power Syst, Beijing 100084, Peoples R China
来源：
JOURNAL OF SUPERCRITICAL FLUIDS | 2013年 / 82卷
基金：
中国国家自然科学基金;
关键词：
Carbon capture and storage; Supercritical CO2; Mechanistic model; SO2; corrosion; Pipeline steel; High ionic strength; CARBON-DIOXIDE CORROSION; AQUEOUS SULFUR-DIOXIDE; MILD-STEEL; X70; STEEL; ATMOSPHERIC CORROSION; WEATHERING STEEL; BARE STEEL; CO2; WATER; IRON;
D O I：
10.1016/j.supflu.2013.05.016
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A mechanistic model was established to predict uniform corrosion rate and investigate the corrosion mechanisms of pipeline steel in supercritical CO2-SO2-O-2-H2O environments. A six-region division (SIWDES: Supercritical CO2, Interface, Water film, Deposition, Electrodic, and Solid) was applied to mathematically describe the model. The modified three-characteristic-parameter correlation model was used to calculate the ion activity coefficients, which calculates the activity coefficients of ions in thin water film with high ionic strength. The model can reasonably predict the corrosion rate of pipeline steel for the primary variables, determine the concentration distribution of each component in the water and product films, and also reflect the impact of corrosion product film on corrosion rate. A comparative analysis between the model and the experimental results showed that the model reasonably predicted the effects of the main factors on corrosion rate. (C) 2013 Elsevier B.V. All rights reserved.
引用
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页码：1 / 12
页数：12
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