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依据电化学阻抗谱评价了LY12铝合金表面双层稀土转化膜的抗腐蚀性能，膜的存在使材料的腐蚀电阻增大，腐蚀速率降低.利用扫描电镜（SEM）观察了稀土（REM）转化膜的表面形貌，膜是以不同尺寸的圆球状颗粒层铺满基体表面.利用X射线衍射（XRD）研究了膜的微观形态，发现膜以非晶态形式存在．利用X射线光电子能谱（XPS）和分析了膜的成分，膜是由铈的氧化物和氢氧化物组成．铈的价态呈三价和四价.
The corrosion resistance of double rare earth conversion coatings on LY12 aluminum alloy was evaluated by electrochemical impedance spectroscopy (EIS). The corrosion resistance of the rare earth conversion coatings on LY12 aluminum alloy surface was increased and the corrosion rate was decreased. The effects of rare earth (REM) conversion coating The surface of the film is covered with spherical particles with different sizes.The microstructure of the film is studied by X-ray diffraction (XRD), and the film is found to be amorphous. The composition of the film was analyzed by X-ray photoelectron spectroscopy (XPS), and the film consisted of oxides and hydroxides of cerium. The valence of cerium is trivalent and tetravalent.