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To investigate the effect of electrical parameters and electrolyte concentration on the properties of Micro-Arc Oxidation (MAO) coatings on magnesium alloys, Mg-Zn series magnesium alloys are used as the research substrate. Silicate-based electrolyte is employed to prepare MAO coatings on the surface of the magnesium alloy. By varying the electrical parameters and electrolyte concentration, this paper studies the influence of different parameters on the performance of the MAO coatings. The results show that with the increase of voltage and duty cycle, and the decrease of frequency, the energy provided increases, leading to an accelerated coating growth rate and an increase in coating thickness. With the increase in current density, the coating thickness initially increases and then decreases, as the effect of current density on coating thickness depends on the growth rate and reaction time. The coating thickness is directly proportional to the electrolyte concentration; however, excessively high electrolyte concentrations can cause localized ablation, resulting in coating detachment. The MAO coatings significantly enhance the corrosion resistance of the magnesium alloy, and both increased coating thickness and reduced pore size can improve the corrosion resistance. MAO samples immersed in a 3.5% sodium chloride solution for 120 h exhibits a corrosion rate of 0.24 mm/a. A composite coating of MAO followed by electrophoretic deposition is prepared on the surface of a magnesium alloy automotive battery case. The MAO coating thickness is approximately 13.7 μm, and the electrophoretic coating thickness is about 25 μm, withstanding a neutral salt spray test for 720 h.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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