Sheng Lu
Jiangsu University of Science and Technology
Title: Ceramic coatings fabricated by micro-arc oxidation on ZK60 magnesium alloys under step current mode
Biography
Biography: Sheng Lu
Abstract
Micro-arc oxidation (MAO) surface treatment technology is able to in-situ form ceramic coatings on the surfaces of aluminum, magnesium, titanium and their alloys by a plasma electrochemical method to enhance surface properties, such as strength, hardness, wear and corrosion resistance. In the present work, MAO coatings on ZK60 magnesium alloys were formed in a self-developed dual electrolyte composed of sodium silicate and phosphate under two–step decreasing current mode. Micro-structure morphology, element and phase structure of MAO coatings were investigated using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), confocal laser scanning microscopy (CLSM), X-ray photoelectron spectroscope (XPS) and X-ray diffraction (XRD). Furthermore, immersion test and friction wear test were employed to evaluate corrosion and abrasion resistance, as well as surface roughness and hardness of the coatings. The in-depth investigation was also focused on the inward and outward growth process, forming mechanism of micro-pores and distribution feature of dense layer and loose layer to achieve a comprehensive understanding on the growth mechanism of MAO coating.
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