Metal thermal spray method

Abstract

Provided is a metal thermal spray method, which does not require a process of imparting an uneven shape to a surface of a base material in advance, A metal thermal spray method of thermally spraying a metal onto a surface ( 1 a ) of a base material ( 1 ) made of a metal, the metal having an ionization tendency larger than that of the metal of the base material ( 1 ), includes: thermally spraying the metal onto the surface ( 1 a ) of the base material ( 1 ); and impregnating a thermally sprayed film ( 2 ) formed by the thermal spraying with a coating material ( 5 ) that contains silane and polyisocyanate and has viscosity of 50 to 500 mPa·s at 25° C. and curing the coating material ( 5 ). In this manner, a pore sealing treatment in the thermally sprayed film ( 2 ) and adhesion strength of the thermally sprayed film ( 2 ) onto the surface ( 1 a ) of the base material are reinforced.

1 . A metal thermal spray method of thermally spraying a metal onto a surface of a base material made of a metal, the metal having an ionization tendency larger than that of the metal of the base material, comprising: thermally spraying the metal onto the surface of the base material; and impregnating a thermally sprayed film formed by the thermal spraying with a coating material that contains silane and polyisocyanate and has viscosity of 50 to 500 mPa·s at 25° C. and curing the coating material, whereby a pore sealing treatment in the thermally sprayed film and adhesion strength of the thermally sprayed film onto the surface of the base material are reinforced. 
     
     
         2 . The metal thermal spray method according to  claim 1 , wherein the coating material contains alkylalkoxysilane as the silane, and the alkylalkoxysilane and the polyisocyanate contained in the coating material has a weight ratio of 10 to 90:90 to 10.