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CORROSION RESISTANCE OF Fe–Al/Al₂O₃ DUPLEX COATING ON PIPELINE STEEL X80 IN SIMULATED OIL AND GAS WELL ENVIRONMENT

MIN HUANG

Zhejiang Provincial Key Laboratory for Cutting Tools, TaiZhou University, TaiZhou 318000, P. R. China

School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, P. R. China

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YU WANG

Zhejiang Provincial Key Laboratory for Cutting Tools, TaiZhou University, TaiZhou 318000, P. R. China

Corresponding author.

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PING-GU WANG

Zhejiang Provincial Key Laboratory for Cutting Tools, TaiZhou University, TaiZhou 318000, P. R. China

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QIN-YI SHI

Zhejiang Provincial Key Laboratory for Cutting Tools, TaiZhou University, TaiZhou 318000, P. R. China

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, and

MENG-XIAN ZHANG

Zhejiang Provincial Key Laboratory for Cutting Tools, TaiZhou University, TaiZhou 318000, P. R. China

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https://doi.org/10.1142/S0218625X15500456Cited by:9 (Source: Crossref)

Abstract

Corrosion resistant Fe–Al/Al₂O₃ duplex coating for pipeline steel X80 was prepared by a combined treatment of low-temperature aluminizing and micro-arc oxidation (MAO). Phase composition and microstructure of mono-layer Fe–Al coating and Fe–Al/Al₂O₃ duplex coating were studied by X-ray diffraction (XRD), scanning electron microscope (SEM) with energy dispersive spectrometer (EDS). Corrosion resistance of the coated pipeline steel X80 in a simulated oil and gas well condition was also investigated. Mono-layer Fe–Al coating consists of Fe₂Al₅ and FeAl, which is a suitable transitional layer for the preparation of ceramic coating by MAO on the surface of pipeline steel X80. Under the same corrosion condition at 373 K for 168 h with 1 MPa CO₂ and 0.1 MPa H₂S, corrosion weight loss rate of pipeline steel X80 with Fe–Al/Al₂O₃ duplex coating decreased to 23% of original pipeline steel X80, which improved by 10% than that of pipeline steel X80 with mono-layer Fe–Al coating. It cannot find obvious cracks and pits on the corrosion surface of pipeline steel X80 with Fe–Al/Al₂O₃ duplex coating.

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