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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１ｍｏｌ／ＬＮａＣｌ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０．５ｍｏｌ／ＬＮａ２ＳＯ４和１ｍｏｌ／ＬＮａＣｌ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
Scanning tunneling microscopy was used to observe the morphological features of the corrosion interface at the microscopic scale. It was found that in the 1 mol / L NaCl aqueous solution of pH = 11, massive oxides were formed on the surface of metallic magnesium, but the thickness of the oxide film was uneven at the microscopic scale. The size of the bulk oxide after the anodization became smaller and the protective effect decreased, resulting in the dissolution of the magnesium metal Negative difference effect. Metallic magnesium produced negative difference effect in both 0.5 mol / L Na 2 SO 4 and 1 mol / L NaCl, but the structure of oxide film was different and the effect of negative difference was different