CO2 corrosion has become one of the main corrosion problems in the development of the natural gas field; the effects of temperature on CO2 corrosion are very complex. In this paper, we chose API 5CT P110 steel as the experimental material. High temperature and high pressure corrosion environments were stimulated, and the effects of temperature on corrosion and the characteristic of corrosion product film of API 5CT P110 steel were discussed by using SEM, XRD and weight loss methods. The result shows that the corrosion rate of API 5CT P110 steel decreases with a rise of temperature in a static condition, which is directly related to the structure and protection of the corrosion product film, the corrosion product film of API 5CT P110 grain coarsening and stacking porous under middle-low temperature, and low protection to matrix which causes the high corrosion rate, while the corrosion product film is thin but dense and adhesion well under high temperature, protect matrix well which cause the corrosion rate to be decreased significantly. The corrosion type of API 5CT P110 steel changes from localized corrosion to general corrosion with the increase of temperature at low CO2 partial pressure, but when the CO2 partial pressure up to 4 MPa, the corrosion type all is localized corrosion at each temperature.

Subject
Scanning electron microscopy, Films, Steel surfaces, Materials, Corrosion rate, Partial pressures, Corrosion products, Film formation, Steel, Corrosion protection, Localized corrosion, Grain, Types of corrosion
Keywords:
CO2 corrosion, temperature, corrosion product film, corrosion rate, localized corrosion, general corrosion
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2013
Association for Materials Protection and Performance (AMPP)
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