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《Journal of University of Science and Technology Beijing》 2007-12
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Formation mechanism of corrosion scales of carbon steel by CO_2 corrosion under high temperature and high pressure

ZHANG Guoan,LU Minxu,WU Yinshun Corrosion and Protection Center,University of Science and Technology Beijing,Beijing 100083,China  
The corrosion behaviors of carbon steel exposed to CO2-containing water under high temperature and high pressure for different intervals of time were measured by using an autoclave.The morphology and microstructure of the CO2 corrosion scale were investigated by SEM,EDS and XRD,and its formation mechanism was discussed.The results indicate that the corrosion scale is mainly composed of Fe3C and a little FeCO3 in the beginning period(8 h),and with the process of corrosion(after 72 h)it changes to FeCO3.The corrosion scale consists of inner and outer scales.HCO-3 penetrates the scale,reaches the scale/substrate interface and reacts with substrate to form the inner scale,while the formation of the outer scale is attributed to the concentration of Fe2+ and CO2-3 in the solution exceeding the solubility of FeCO3.The grain size of the outer scale is smaller and denser than that of the inner scale.The adhesion intensity between the inner and outer scales is weak but that between the inner scale and substrate is strong.
【Fund】: 国家自然科学基金重点资助项目(No.50231020)
【CateGory Index】: TG172.3
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