Preparation of Micro-arc Discharge Oxidized Coating on Hot-dip Aluminized Stainless Steel Sheet

Abstract

Abstract: A new method of surface treatment for austenitic stainless steel sheets was developed to improve their mechanical performance. An aluminium layer
was firstly formed on the surface of stainless steel by immersing the sheet into a 760℃ molten aluminium bath for 8 min. The aluminized stainless
steel sheet was then treated by micro-arc discharge oxidation. The structure of the resultant compound coating was analyzed by using X-ray diffraction,
scanning electron microscopy with energy dispersive spectrometer and Vickers micro-hardness tester. The results show that a ceramic coating composed mainly
of α-Al₂O₃ and γ-Al₂O₃ is formed on a medium intermetallic compound layer and the content of γ-Al₂O₃ is higher than that of α-Al₂O₃. The micro-hardness of the compound coating
shows a gradation from the coating surface (800HV) to the substrate (230HV) through the medium intermetallic compound layer (250～600HV).

Key words: austenitic stainless steel, hot-dip aluminium, micro-arc discharge oxidation, coating

CLC Number:

TG174

YANG Zhong-Shi,JIA Jian-Feng,TIAN Jun,HE De-Yan. Preparation of Micro-arc Discharge Oxidized Coating on Hot-dip Aluminized Stainless Steel Sheet[J]. Journal of Inorganic Materials.

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Preparation of Micro-arc Discharge Oxidized Coating on Hot-dip Aluminized Stainless Steel Sheet

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