AZ31镁合金盐浴渗铝改善耐蚀性机制分析
发布时间：2018-08-02 08:15
【摘要】：采用真空热扩散渗铝的方法对AZ31镁合金进行表面合金化处理,在不同参数下得到厚度不一的渗铝层,对渗层的显微组织、物相组成进行了分析,并分析了渗铝试样的耐腐蚀性能和显微硬度.绘制了AZ31镁合金基体以及经过400℃扩散渗铝4 h后的试样的极化曲线.结果表明,渗层主要由Mg17Al12,Mg3Al2和α-Mg等组成,渗层厚度随扩散温度提高而增加,400℃恒温热扩散4 h时,在基体表面获得了连续且均匀细密的渗铝层,显微硬度值从基体的53 HV提高到80~85 HV,同时,该方法使得镁合金的自腐蚀电位提高了约105 m V,而镁合金的自腐蚀电流密度降低了一个数量级,这表征着镁合金的耐蚀性能得到提高.
[Abstract]:The surface alloying of AZ31 magnesium alloy was carried out by vacuum thermal diffusion aluminizing. The aluminizing layer with different thickness was obtained under different parameters. The microstructure and phase composition of the layer were analyzed. The corrosion resistance and microhardness of aluminized samples were analyzed. The polarization curves of AZ31 magnesium alloy matrix and the sample after 4 h diffusion aluminizing at 400 鈩，
本文编号：2158783
[Abstract]:The surface alloying of AZ31 magnesium alloy was carried out by vacuum thermal diffusion aluminizing. The aluminizing layer with different thickness was obtained under different parameters. The microstructure and phase composition of the layer were analyzed. The corrosion resistance and microhardness of aluminized samples were analyzed. The polarization curves of AZ31 magnesium alloy matrix and the sample after 4 h diffusion aluminizing at 400 鈩，
本文编号：2158783
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