Preparation of Alumina Coatings on Titanium by Cathodic Micro-arc Electrodeposition

Abstract

Abstract: An alumina coating with a thickness of 100μm on a titanium substrate was prepared by cathodic micro-arc electrodeposition. The microstructures and phase compositions
of the coating at different voltages were studied, and the growth mechanism of the coating was analyzed. The results show that the coating grows by
the following steps: the stage of no electric spark, micro-arc discharge and local arc light. In these courses Al(NO₃)₃ is dissociated and Al(OH)₃
is deposited and dehydrated. The high temperature and pressure produced in micro-arc area are keys to the formation of the alumina coating. The coating
is mainly composed of γ-Al₂O₃ and α-Al₂O₃. The content of α-Al₂O₃ is increased with increasing voltage, which
amounts to 7% at 400V.

Key words: cathodic micro-arc electrodeposition, titanium, alumina coating

CLC Number:

YQ174

LI Xin-Mei,LI Yin-Suo,HAN Yong State. Preparation of Alumina Coatings on Titanium by Cathodic Micro-arc Electrodeposition[J]. Journal of Inorganic Materials.

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