采用小型微弧氧化电源装置和新颖的喷射式阴极,解决传统的浸入式微弧氧化工艺不能用于外场大面积构件局部修复用涂层制备的问题.采用XRD、SEM、EDS等分析手段研究涂层的物相与组织结构.用动电位极化法及盐雾腐蚀试验评价涂层的抗腐蚀性能.结果表明,相同电参数条件下,喷射式微弧氧化电流密度略高于浸入式氧化,生长的涂层厚度稍低于浸入式氧化,喷射式与浸入式微弧氧化涂层生长规律一致.涂层主要由α-Al2O3和γ-Al2O3组成,涂层内层致密,表面多微孔.TAFEL极化曲线与盐雾腐蚀测试均表明,微弧氧化涂层明显改善LY12铝合金抗腐蚀性能.
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