Effect of Current Density on the Microstructure and Corrosion Properties of MAO Coatings on Aluminum Alloy Shock Absorber

Abstract:

In order to improve the corrosion resistance of shock absorber for ships, the alumina ceramic coatings are carried out on the surface of aluminum alloy shock absorber by micro arc oxidation (MAO) technology. The microstructure and anti-corrosion performance of the MAO coatings were investigated experimentally. This paper mainly focuses on the experimental work to determine the effect of current density on the structural characteristics and corrosion resistance of MAO coatings. The results show that the current density has a significant influence on the preparation of MAO coating during the process. The surface of the coating becomes more compact and smooth with the cathode voltage of 7 A.dm^-2. Furthermore, the anti-corrosion performance of the MAO coatings can effectively be improved at the current density of 7 A.dm^-2.

• Periodical: Key Engineering Materials (Volume 764)
• Pages: 28-38
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.764.28
• Online since: February 2018
• Authors: Yan Shen*, Hong Xiang Wang, Yi Peng Pan
• Keywords: Aluminum Alloy, Corrosion Resistance, Current Density, Micro Arc Oxidation, Microstructure

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