Aluminum was electrodeposited with constant current on AZ31 magnesium alloy pretreated under optimized conditions from trimethyl-phenyl-ammonium chloride and anhydrous aluminum chloride(TMPAC-AlCl3)quaternary ammonium room temperature ionic liquids with benzene as a co-solvent.The corrosion resistance of the as-deposited Al layers was evaluated in 3.5％ NaCl solution by the electrochemical technologies.The Al depositions were characterized by scanning electron microscopy equipped with energy dispersion X-ray.The results show that the microstructures of the Al depositions have spherical equiaxed grains obtained at a high current density,and bulk grains at a low current density.The Al deposition obtained at 12.3 mA/cm2 has a smooth and compact surface.The electrochemical measurements indicate that the thicker Al deposition can more effectively protect the Mg substrate.The Al deposition with bulk grains hardly protects the AZ31 Mg substrate from corrosion owing to its porosity.%采用TMPAC-AlCl3离子液体,在浸锌后的镁合金AZ31表面实施恒流电镀铝,采用电化学技术评估镀铝层的耐蚀性,并采用SEM/EDX等技术表征镀层.结果表明:在浸锌后的镁合金表面可获得表面光洁的银白色镀铝层.在不同的电流密度下,呈现出两种形貌不同的镀铝层；在较佳电流密度12.3 mA/cm2时,镀铝层表面较致密:电镀时间越长,镀层越厚,镀铝层耐蚀性越好.
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