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采用以苯为助溶剂的TMPAC-AlCl3季铵盐室温离子液体,在铜上电镀铝.探讨了电流密度和电镀时间对镀铝层表观形貌和阴极电流效率的影响;通过极化曲线评价了镀铝层的耐蚀性,并采用扫描电镜,能量弥散X射线谱仪和X射线衍射仪等手段对样品进行表征.结果表明,在电流密度为15 mA/cm2,电镀时间为30 min条件下获得的镀铝层表面致密,阴极电流效率最高,达92%.阴极电流效率随电镀时间延长而下降,主要原因为AlCl3在Al阳极表面上的析出.极化曲线测试表明,镀铝层越厚,镀层的耐蚀性越好;厚度达17μm的镀铝层具有阳极钝化行为,可有效地保护基体.
The effect of current density and plating time on the apparent morphology and cathodic current efficiency of aluminum plating was discussed by using room temperature ionic liquid of TMPAC-AlCl3 quaternary ammonium salt with benzene as cosolvent. The corrosion resistance of the aluminized layer was investigated and the samples were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (XRD) and X-ray diffractometer.The results showed that under the conditions of current density of 15 mA / cm2 and plating time of 30 min The results showed that the surface of the aluminized layer was dense and the cathodic current efficiency was the highest, reaching 92%. The cathode current efficiency decreased with the plating time, mainly due to the precipitation of AlCl3 on the Al anode surface. Thicker, the corrosion resistance of the coating is better; the thickness of 17μm aluminum plating layer has anodic passivation behavior, which can effectively protect the substrate.