The processes of mixed rare earth metal (REM) conversion coatings on 2024 alloy and A16061/SiCp metal matrix composites (MMC) were introduced. The coatings were examined to be honeycomb-like feature by scanning electron microscope. X-ray diffraction analysis revealed that the coatings are amorphous structure. The results of X-ray photoelectron spectroscopy indicated that the mixed REM conversion coatings consist predominantly of Ce and O, the contents of other rare earth elements (such as La, Pr) are relatively low, the coatings are about 2 similar to 4 mu m thickness with excellent adhesion and wearability. The results of mass loss test showed that the mixed REM conversion coatings produce corrosion resistant surface of 2024 alloy and Al6061/SiCp.
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