Effect of Temperature on the Corrosion Resistance of QPQ Treated Specimens in CO₂ Environment

Abstract:

When the pressure of CO₂ is 2 MPa, through the autoclave corrosion tests of annealed N80 steel specimens in simulated oil field water solution at different temperature, the mechanism of corrosion and the change rule of corrosion resistance with the change of temperature were discussed. In the autoclave tests, some iron elements of the specimens become Fe²⁺ ions and the Fe²⁺ ions go into the solution, which results in the corrosion weight loss. Scaling develops because the CO₃^2- ions in the simulated oil field water solution react with iron elements of the specimen. To QPQ treated specimens, with the increase of temperature, the compactness of the scaling increase, the corrosion weight loss and the weight of scaling decrease. In the same temperature, the corrosion weight loss and the weight of scaling of QPQ treated specimens are both lower than that of untreated specimens.

• Periodical: Applied Mechanics and Materials (Volumes 66-68)
• Pages: 669-672
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.66-68.669
• Online since: July 2011
• Authors: Yuan Hui Li, Shi Ping Zhang, Jing Wang, Yi Chao Ding
• Keywords: CO₂ Corrosion Resistance, QPQ Treatment, Salt Bath Nitriding, Steel N80

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