利用扫描隧道显微镜,在微观尺度观察腐蚀界面形貌特征.发现pH=11的1 mol/L NaCl水溶液中,金属镁表面形成块状氧化物,但微观尺度上氧化膜厚度不均,阳极化后块状氧化物尺度变小,保护作用降低,导致镁金属溶解出现负差数效应.金属镁在0.5 mol/L Na2SO4 和1 mol/L NaCl两种介质中都产生负差数效应,但氧化膜结构不同,负差数效应强弱有别.
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