对含有不同体积分数β相的镁-铝合金进行实验室模拟的NaCl污染微粒诱发的大气腐蚀实验,采用扫描电镜(SEM)对腐蚀产物的截面形貌以及去除腐蚀产物后基体的腐蚀形貌进行观察.结果发现,镁铝合金的大气腐蚀源自NaCl污染微粒沉积的位置.腐蚀增重结果表明随着β相体积分数的增加,镁铝合金的腐蚀程度加剧.这是因为β相的增加,增大了微电偶电池的阴极面积.可见,在双相镁铝合金中,随着β相的增加,β相与α相之间的腐蚀微电偶作用增强.
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