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Corrosion Resistant Ceramic Coating For X80 Pipeline Steel By Low-Temperature Pack Aluminizing And Oxidation Treatment

Author

Listed:
  • HUANG MIN

    (College of Physics and Electronic Engineering, Taizhou University, Taizhou 318000, P. R. China;
    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, P. R. China)

  • FU QIAN-GANG

    (State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, P. R. China)

  • WANG YU

    (College of Physics and Electronic Engineering, Taizhou University, Taizhou 318000, P. R. China)

  • ZHONG WEN-WU

    (College of Physics and Electronic Engineering, Taizhou University, Taizhou 318000, P. R. China)

Abstract

In this paper, we discuss the formation of ceramic coatings by a combined processing of low-temperature pack aluminizing and oxidation treatment on the surface of X80 pipeline steel substrates in order to improve the corrosion resistance ability of X80 pipeline steel. First,Fe-Alcoating consisting ofFeAl3andFe2Al5was prepared by a low-temperature pack aluminizing at 803 K which was fulfilled by adding zinc in the pack powder. Pre-treatment of X80 pipeline steel was carried out through surface mechanical attrition treatment (SMAT). Further oxidation treatment of as-aluminized sample was carried out in the CVD reactor at 833 K under oxygen containing atmosphere. After 1 h duration in these conditions, ceramic coating consisting of α-Al2O3was formed byin situoxidation reaction ofFe-Alcoating. Those coatings have been characterized by different techniques including X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectroscope (EDS), respectively. Ceramic coating shows a dense and uniform microstructure, and exhibits good coherences with X80 pipeline steel substrates. By electrochemical corrosion test, the self-corrosion current density of X80 pipeline steel with as-obtained ceramics coating in 3.5%NaClsolution shows an obvious decrease. The formation of α-Al2O3ceramic coating is considered as the main reason for the corrosion resistance improvement of X80 pipeline steel.

Suggested Citation

  • Huang Min & Fu Qian-Gang & Wang Yu & Zhong Wen-Wu, 2013. "Corrosion Resistant Ceramic Coating For X80 Pipeline Steel By Low-Temperature Pack Aluminizing And Oxidation Treatment," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 20(06), pages 1-6.
    • Handle: RePEc:wsi:srlxxx:v:20:y:2013:i:06:n:s0218625x13500637
    DOI: 10.1142/S0218625X13500637
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