采用微弧氧化技术在1050纯铝表面制备陶瓷膜, 分析了不同制备参数对应的电压与时间曲线. 表征了陶瓷氧化膜的厚度、微观形貌, 膜层结构和成分; 评定了陶瓷氧化膜在NaCl溶液中耐腐蚀性能. 随着电流密度的增大, 陶瓷膜的厚度呈线性快速增加. 微弧氧化后试样具有更高的腐蚀电位和更低的腐蚀电流密度, 并且发现铝合金的维钝电流密度可以从0.1 A/cm2降低为10-7 A/cm2, 低的腐蚀电流密度可能是由于膜的厚度、致密度等决定.
Al2O3 ceramic coatings were directly prepared on 1050 pure aluminum by micro-arc oxidation(MAO) technology. The voltage-time responses were recorded during different MAO processes. Evolvement of surface morphology, composition and thickness of ceramic coatings on aluminum alloy were characterized. It is clear that the average coatings thickness increases as the applied current densities increase in the initial stage. During these stages, the coatings grew linearly and quickly. The potentiodynamic polarization curves of coated aluminum samples and the untreated metal substrate show that the MAO coated aluminum samples possess much higher corrosion potential and lower corrosion current rather than the bare aluminum alloy. It is noticed that the passive current density of the samples decreased from 0.1 A/cm2, for the aluminum, to 10-7 A/cm2, for MAO coated aluminum sample. The low corrosion current density for the MAO coating may be controlled by the thickness and density of coatings.
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