Abstract
Biodegradable microarc oxidation (MAO) coatings were prepared on the Mg-2.0Zn-0.5Ca alloys treated with and without deep cryogenic treatment (DCT). Scanning electron microscope (SEM) and X-ray diffractometer (XRD) were used to characterize the coating morphology and phase composition. The electrochemical corrosion behavior was investigated using the electrochemical workstation. The effects of DCT on the formation mechanism and corrosion behavior of the MAO coatings were investigated. The results indicate that the DCT has refining effect on the Mg-2.0Zn-0.5Ca alloy. The mechanisms of the coating formation and growth can be influenced by the introduction of the DCT through influencing the grain size, phase precipitation and crystal defect states of the substrate. The changing of the microstructure of the alloy can alter the spark discharge characteristics of the MAO reaction. The DCT has an effect on the controllability of the corrosion rate of the MAO coated samples.
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