Patent ID: 7691454

Claim:
An electrical-discharge surface-treatment method for forming a coat on a surface of a workpiece using a pulse electrical discharge caused between an electrode and the workpiece, the method comprising: forming the coat with a material constituting the electrode or a substance that is generated by a reaction of the material due to the pulse electrical discharge, wherein: the electrode is formed with a metallic powder or a metallic compound powder having an average grain diameter of 6 micrometers to 10 micrometers and containing a metallic material, the coat containing the metallic powder or the metallic compound powder as a main constituent is formed under conditions of a width of a current pulse for the pulse electrical discharge in a range of 50 microseconds to 500 microseconds and a peak of the current pulse in a range of 2 amperes to 30 amperes, and the metallic material is as likely or less likely to be carbonized than at least one of Co, Fe, and Ni.