Effect of Temperature on H₂S/CO₂ Corrosion Behaviors of P110-3Cr Steel

Abstract:

Flowing solution environment containing H₂S/CO₂ was simulated by high temperature and high pressure autoclave. Corrosion behaviors of P110-3Cr pipeline steels were investigated by Weight loss, Scanning electron microscopy (SEM), X-Ray diffraction (XRD) and Energy dispersive spectrometer (EDS). Effect of temperature on corrosion rate and corrosion product was discussed. The results showed that corrosion rate of P110-3Cr steel decrease at the beginning and then increased with rising temperature. The corrosion types are general corrosion. P110-3Cr has resistance to local corrosion. Mackinawite (FeS_0.9) is formed as corrosion product in low-temperature condition. With temperature increasing the corrosion products are dominated by mackinawite (FeS_0.9) and Cubic iron sulfide (Fe₃S₄). When temperature increased to 150 ¡æ, the corrosion products are made up of Hexagonal iron sulfide (Fe_0.96S) and Orthorhombic Marcasite (FeS₂). No siderite (FeCO₃) is detected, the corrosion is controlled by H₂S; Cr is rich in the corrosion scale.

• Periodical: Advanced Materials Research (Volumes 816-817)
• Pages: 54-59
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.816-817.54
• Online since: September 2013
• Authors: Xin Su, Jian Bo Sun, Chong Sun, Bin Han
• Keywords: Corrosion Scale, H₂S/CO₂ Corrosion, Low Cr Steel, Temperature

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