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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。
A micro-arc micro-arc oxidation power supply device and a novel jet cathode are adopted to solve the problem that the traditional immersion micro-arc oxidation process can not be used for the preparation of a coating for the local repair of a large area component in an external field. XRD, SEM, EDS and other analytical tools to study the phase and structure of the coating. Corrosion resistance of coatings was evaluated by potentiodynamic polarization test and salt spray corrosion test. The results show that under the same electrical parameters, the current density of micro-arc oxidation is slightly higher than that of immersion oxidation. The thickness of the coating is slightly lower than that of immersion oxidation. The growth of sprayed micro-arc oxidation coating is consistent with that of immersion micro-arc oxidation coating. The coating is mainly composed of α-Al2O3 and γ-Al2O3, the coating layer is dense, the surface microporous. TAFEL polarization curves and salt spray corrosion tests show that the micro-arc oxidation coating significantly improve the corrosion resistance of LY12 aluminum alloy.