PROBLEM TO BE SOLVED: To provide a method of surface coating, which method can form a coating layer having excellent erosion resistance while suppressing the effect of heat input on a workpiece.;SOLUTION: In the method of surface coating for forming a coating layer 18 of the component of an electrode on the surface of the workpiece by generating the electric discharge between the conductive workpiece 11 and the electrode 3 by applying pulse voltage, the electrode 3 has the hardness equal to or higher than that of the workpiece 11, and the coating layer 18 is formed after preheating the workpiece 11. While the coating layer 18 is formed by the electric discharge, the surface temperature of the workpiece in the region for forming the coating layer 18 is controlled so as to be within the range from 80 to 250°C, and the amount of the heat input to the workpiece 11 by the electric discharge is set to be 1 kJ/cm or lower.;COPYRIGHT: (C)2008,JPO&INPIT
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