CORROSION RESISTANCE OFFe–Al/Al2O3DUPLEX COATING ON PIPELINE STEEL X80 IN SIMULATED OIL AND GAS WELL ENVIRONMENT

Min Huang, Yu Wang (), Ping-Gu Wang, Qin-Yi Shi and Meng-Xian Zhang
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Min Huang: Zhejiang Provincial Key Laboratory for Cutting Tools, TaiZhou University, TaiZhou 318000, P. R. China;
Yu Wang: Zhejiang Provincial Key Laboratory for Cutting Tools, TaiZhou University, TaiZhou 318000, P. R. China
Ping-Gu Wang: Zhejiang Provincial Key Laboratory for Cutting Tools, TaiZhou University, TaiZhou 318000, P. R. China
Qin-Yi Shi: Zhejiang Provincial Key Laboratory for Cutting Tools, TaiZhou University, TaiZhou 318000, P. R. China
Meng-Xian Zhang: Zhejiang Provincial Key Laboratory for Cutting Tools, TaiZhou University, TaiZhou 318000, P. R. China

Surface Review and Letters (SRL), 2015, vol. 22, issue 04, 1-8

Abstract: Corrosion resistantFe–Al/Al2O3duplex 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-layerFe–Alcoating andFe–Al/Al2O3duplex 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-layerFe–Alcoating consists ofFe2Al5andFeAl, 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 MPaCO2and 0.1 MPaH2S, corrosion weight loss rate of pipeline steel X80 withFe–Al/Al2O3duplex coating decreased to 23% of original pipeline steel X80, which improved by 10% than that of pipeline steel X80 with mono-layerFe–Alcoating. It cannot find obvious cracks and pits on the corrosion surface of pipeline steel X80 withFe–Al/Al2O3duplex coating.

Keywords: Pipeline steel X80; Fe–Al/Al2O3duplex coating; corrosion resistance; simulated oil and gas environment (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1142/S0218625X15500456

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