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采用X－射线光电子能谱（XPS）、俄歇（AES）深度剖析等表面分析技术，并结合扫描电镜（SEM）和动电位极化实验，研究了LY12CZ铝合金表面铈转化膜的形成条件、耐蚀性和组成结构．研究结果表明：当Ce~3＋超过临界缓蚀浓度时，开路电位下形成的铈转化膜比自然氧化铝膜具有更强的抗点蚀性．铈转化膜呈多层结构，其表层由结晶态的CeO_2和无定形、非化学计量的nCe（OH）_3mCe（OH）_4组成．
The formation conditions of cerium conversion coating on the surface of LY12CZ aluminum alloy were investigated by SEM and X-ray photoelectron spectroscopy (XPS) and AES (Auger depth analysis) Corrosion resistance and compositional structure. The results show that when the Ce ~ 3 + concentration exceeds the critical corrosion inhibition concentration, the cerium conversion coating formed at the open circuit has stronger pitting corrosion resistance than the natural alumina coating. The cerium conversion coating has a multi-layer structure, and its surface layer is composed of crystalline CeO 2 and amorphous, non-stoichiometric nCe (OH) 3mCe (OH) 4.