With the development of research about the surface phenomena such as adhesion and adsorption,the new kinds of composite coatings are developed rapidly and gradually replacing traditional materials.The aim of various surface engineering techniques is to manufacture composite coatings with excellent corrosion resistance,high wear resistance and high temperature resistance.At present,there are still defects such as high internal porosity,low bond strength and low fracture toughness for the composite coating fabricated through various surface preparation techniques.Numerous studies show that the rare earth elements and their oxides have an important effect on improving the structure and properties of coatings.The effects of rare earth or its oxide additives on coatings are discussed,and an overview of the effects on refinement of coating microstructure is focused on,as well as the improvement of corrosion properties,and the mechanism of rare earth effects are illustrated in detail.On this basis,the future research prospects of rare earth modified coatings are also discussed.
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