CORROSION RESISTANT CERAMIC COATING FOR X80 PIPELINE STEEL BY LOW-TEMPERATURE PACK ALUMINIZING AND OXIDATION TREATMENT

Huang Min, Fu Qian-Gang, Wang Yu () and Zhong Wen-Wu
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Huang Min: College of Physics and Electronic Engineering, Taizhou University, Taizhou 318000, 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

Surface Review and Letters (SRL), 2013, vol. 20, issue 06, 1-6

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.

Keywords: Corrosion resistance; coating; aluminizing; oxidation; pipeline steel (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1142/S0218625X13500637

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