Corrosion Behavior of L245N Standard Steel in CO2 Saturated Brine under Flow Condition

被引:3
作者
Hu, Ying [1 ,2 ]
Xin, Long [2 ]
Liu, Tingguang [2 ]
Lu, Yonghao [1 ,2 ]
机构
[1] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, Natl Ctr Mat Serv Safety, Beijing 100083, Peoples R China
关键词
flow condition; L245N standard steel; high salinity; cementite; CARBON-DIOXIDE CORROSION; HEAT-TREATMENT; MICROSTRUCTURE; OIL; PERFORMANCE; RESISTANCE; CRACKING; CALCIUM; SYSTEMS;
D O I
10.3390/met11060880
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The corrosion behavior of oilfield used L245N standard steel was tested in simulated oilfield solution by dynamic high-temperature autoclave. The corrosion products were characterized by using scanning electron microscopy (SEM), X-ray diffraction (XRD) and Electrochemical impedance spectroscopy (EIS) respectively. In addition, the corrosion rates and surface morphological characteristics of the steels after different exposure times were studied. The results showed that the corrosion rate decreased sharply and then increased with time in the high salinity flow solution, which was related to the formation of corrosion scale and the remaining cementite within it. At the beginning of the exposure time, the formed corrosion scale became thicker, resulting in a significant decrease of the corrosion rate. While with increasing time, on the one hand, the increased remaining cementite within corrosion scale facilitated the corrosion by the galvanic corrosion between the remaining cementite and the ferrite within the metal. On the other hand, the protective effect of corrosion scale formed on the remaining cementite skeleton declined due to the formation of large amounts of FexCa1-xCO3, which also promoted the corrosion rate of the steels, both these ways contributed to a slow increase of corrosion rate.
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页数:22
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