The purpose of this paper is forming a plating film excellent in self-lubricity in high temperature by making acetylene black particles codeposit in a nickel tungsten alloy film which shows outstanding heat-resistivity and oxidation-resistivity.
Since acetylene black particles as received showed hydrophobicity and it was hard to disperse them into a plating bath, the acid functional group was first introduced on the surface of particles by thermal oxidation, and condensation of the 2-amino ethanol was also carried out.
As a result, an amino group was introduced on the surface of particles, and particles came to show hydrophile property.
When these particles were added to the plating bath and the electrodeposition was performed, the particles only thermally oxidized did not codeposit, but the particles which introduced the amino group were codeposited in the nickel tungsten film.
It became clear that an amino group interacts with nickel ion in the domain beyond pH=4 by the analysis using the potentiometric titration method.
The hardness of the film which acetylene black particles codeposited was comparable to a film which does not contain particles, and a possibility of obtaining an outstanding film with lubricity in high temperature was shown, without spoiling the characteristics of the nickel tungsten alloy.
