利用多种表面分析手段比较研究了纯Mg和Mg-8Al、Mg-8Al-R E等镁铝合金在Mg(OH )2饱和的35％NaCl溶液中的腐蚀产物膜的形貌及结构.发现Al元素的加入使镁合金表面 形成含Mg、Al的复杂氧化物，有利于提高镁合金耐腐蚀性.稀土元素RE的加入有利于提高Al 元素在氧化膜中的含量，形成具有三层结构的产物膜，进一步提高了Mg-Al合金的耐腐蚀性.
The corrosion resistance of magnesium-aluminum allo ys is closely related to the corrosion product film formed on the alloy's surfac e.The morphology and structure of the corrosion product film on pure Mg,Mg-Al and Mg-Al-RE alloys in the solution containing Cl\+- were examined by the var ious sur face analysis techniques including EMPA,EDS,SEM,TEM,XRD,AES etc.The results indi cated that the elemental aluminum is conducive to the corrosion resistance of al loys,but its beneficial effect is limited and unstable.The RE addition can obvi ously increase the Al concentration in corrosion product film.Also,the distribut i on of Al in corrosion product film of Mg-Al-RE alloys was broadened due to the a dd ition of RE.It indicated that the RE element promoted the formation of protectiv e film containing elemental Al.
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