Casting-on surfacee alloying by means of YB typically,the wear resistence of surface composite alloyed layer with high-Cr and high-W on cast steel ZG65Mn,can be improved obviously.

Based on the technology of Co-B and Co-P alloys nanocrystalline coatings, the ternary Co-Ni-B and Co-Ni-P nanocrystalline alloy coatings were obtained, and the deposit rate and microstructure of ternary nanocrystalline alloys were investigated.

Results showed that satisfactory alloyed layer could be also formed on steel castings without adding fusing agent into alloy coating.

The Ni-based alloy coating and Ni-clad WC ceramic coating were prepared and characterized by abrasive wear resistance test.

By using this new process, Zn-Ni and Zn-Al-Ni alloy coatings with different proportions on steel substrate are obtained.

Composite alloy coatings of intermetallic compound dispersed and distributed in amorphous alloypossess excellent corrosion resistance and abrasion performance.

Ni-W-Co alloy coating and Ni-W-Co/SiC composite coating were obtained by using the technique of electrodeposition.

As a new substitute of hard Cr plating, the bonding strength of Ni-Fe-W-P alloy plating was studied contrasting with hard Cr plating by means of static and dynamic loading.

The progress is dwelt in this paper including the eletroless plating technology application in common materials,the function and application of alloy plating,complex strengthening heat treatment,surface re treatment etc.