Taking to improve the surface properties and service life as the goal and proceeding from the demand for retaining the good conductivity of pure copper, the authors have successfully prepared the Cu-Ti and Cu-Ni alloyed layers on the pure copper substrate by titanizing and nicklizing with .

The working performance of Ni-P and Ni-Co alloy coating of HT200 gray cast iron gear's tooth surface was studied.

The effect of Tungsten on the microstructure of Ni-W alloy coatings prepared by the pulse electrodeposition technology is firstly investigated by X-ray Diffraction.

Ni-W alloy coatings are prepared by pulse electrodeposition.

Ni-W alloy coatings with excellent hardness, wear resistance and appearance produced by electrodeposition were introduced in this dissertation.

A new Ni-Fe-W alloy coatings were obtained by pulse electrodeposition,the effect of W in the electrolyte contents on the structure of coatings,and the effect of the electrolyte contents on the hardness and thickness of coatings were discussed.

Then,the effects of the concentration of NiSO_4·6H_2O、Na_2WO_4·2H_2O、FeSO_4·7H_2O and temperature on the quality of Ni-Fe-W alloy coatings are also addressed.