PURPOSE: To obtain a surface treating film having superior adhesive property and joining force by subjecting an ordinary surface treating film on a base material to hot hydrostatic pressing treatment.
CONSTITUTION: An ordinary surface treating film such as a plated layer 2 is formed on a base material 1. The layer 2 is isolated from the open air and subjected to hot hydrostatic pressing treatment in a high temp. and high pressure gaseous atmosphere which is suitable for the joining of the layer 2 to the material 1 by diffusion, does not cause the reaction of them, and exerts no unfavorable influence on the material 1. Gaseous H2 or the like contained in the pores in the layer 2 is discharged, th layer 2 is joined to the material 1 by diffusion, and the layer 2 intrudes deeply into the material 1 and produces strong joining force.
FUJIKAWA TAKAO
MIYANAGA JIYUNICHI
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