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Journal of Inorganic Materials

Journal of Inorganic Materials >

2007 , Vol. 22 >Issue 3: 534 - 538

DOI: https://doi.org/10.3724/SP.J.1077.2007.00534

Research Paper

Evolution of Aluminium Layer Transformed into Ceramic Coating on Steel Substrate

  • WU Zhen-Qiang ,
  • XIA Yuan ,
  • ZHANG Chun-Jie ,
  • LI Guang
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  • 1. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China; 2. School of Materials Science and Engineering, China University of Geosciences, Beijing 100083, China

Received date: 2006-07-03

  Revised date: 2006-08-18

  Online published: 2007-05-20

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Abstract

The external aluminium layer was transformed into a ceramic coating by the treatment of plasma electrolytic oxidation (PEO) on aluminized steel. Characteristics of anodic voltage, thickness growth regularity, cross-sectional morphologies and compositions of the ceramic coating were investigated. The results show that the anodic voltages of aluminized steel and pure aluminum vary similarly at the initial PEO stage, but the voltage of aluminized steel decreases at later PEO stage. The aluminium layer is consumed, and the ceramic-coating thickness increases linearly. The FeAl layer begins to participate in PEO process as the aluminium layer is transformed completely into the ceramic coating. Nevertheless, the ceramic coating grows slowly and many micro-cracks are observed at the Al2O3/FeAl interface. The ceramic coating is mainly composed of Al, Si and O elements. It consists of γ-Al2O3, mullite, and α-Al2O3 phase appearing only at the last PEO stage. The hardness distribution of the coating is regional and the maximum is about HV 1800.

Key words： hot-dip aluminum; plasma electrolytic oxidation; ceramic coating; transforming regularity

Cite this article

WU Zhen-Qiang , XIA Yuan , ZHANG Chun-Jie , LI Guang . Evolution of Aluminium Layer Transformed into Ceramic Coating on Steel Substrate
[J]. Journal of Inorganic Materials, 2007 , 22(3) : 534 -538 . DOI: 10.3724/SP.J.1077.2007.00534

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