PURPOSE: To easily clean the surface of a metallic material and to form a chemical conversion coating excellent in rust-preventing property and adhesion by carrying out peening treatment by using an abrasive material or blasting material where specific chemical coating material is allowed to adhere at the time of applying treatment of rust prevention, coating, plating, etc., to the surface of a metallic material.

CONSTITUTION: At the time of carrying out surface treatment for the purpose of improving rust-preventing property at the surface of a metallic material and improving the adhesion of plating film and paint film in plating and coating, blasting or peening treatment is exerted by using a granular grinding or blasting material, such as grits and glass beads, in which one or ≥2 kinds among phosphate, chromate, oxalate, and silicate are stuck to the surface by means of a pressure sensitive adhesive. Since the surface of the metallic material can be cleaned by a simplified process and a chemical conversion coating due to the salts can be formed, a chemical conversion treated surface excellent in rust-preventing property and adhesion of plating film and paint film can be obtained.