Abstract
Micro-arc oxidation (MAO) process was carried out in a dual electrolyte system of NaAlO 2 and Na 3PO 4 to develop compact, smooth and corrosion-resistant coatings on ZK60 Mg alloy by single factor experiments. The microstructural characteristics of coatings were investigated by X-ray diffractometry (XRD) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). Test of mass loss was conducted at a 3.5% NaCl solution to assess the resistance to corrosion. The effect of every element in the dual electrolyte system on voltage-time responses during MAO process and the coating characteristic were also analyzed and discussed systematically via single factor experiments. The results reveal that the main components of NaAlO 2 and Na 3PO 4 as well as additives of NaOH, NaB 4O 7 and C 6H 5Na 3O 7 demonstrate different effects on MAO process and coating characteristics. By means of single factor experiments, an optimized dual electrolyte system was developed, containing 17.5 g/L NaAlO 2, 5.0 g/L Na 3PO 4, 5.0 g/L NaOH, 3.0 g/L NaB 4O 7 and 4.2 g/L C 6H 5Na 3O 7.
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