超临界C 02对钢材的腐蚀实验研究

EXPERIMENTAL STUDY OF CORROSION OF STEEL IN SUPERCRITICAL FLUID CO

(1.“油气藏地质及开发工程”国家重点实验室·西南石油大学，四川成都610500; 2.西南石油大学材料科学与工程学院)

(Southwest Petroleum University, Chengdu Sichuan 610500，China )

With the static high pressure and high temperature kettle and the SEM method，and based on the analysis between the supercritical fluid COand the interaction of the water and oil, the corrosion experimental study for the N80 steel grade in the supercritical fluid CO was investigated. The results were show that the C0 corrosion was found in the SCF-CO gas phase. In the liquid phase, the corrosion rate was accelerated with the increas-ing of pressure; it got the peak at 12 MPa and then down. In the medium of pure water, the corrosion rate in the gas was agreed with the corrosion rate in the liquid at 12 MPa, the tubercules were observed in corrosion film. The corrosion rate in the liquid was accelerated if the civde oil content was 30%.The tuber- rules and poles were found in the corrosion film together. The C0corrosion of steel was restrained with the increasing of the oil content.

10.3863/j.issn.1000-2634.2006.02.024