Chemical coating of titanium with anti-friction nickel-phosphorus alloy
Chemical nickel plating of titanium increases its anti-friction quality.
When two surfaces with a nickel coating 20–40μ thick are fitted together the pressure at which grabbing begins is 180–200 kg/cm2 and the friction coefficients are respectively 0.12–0.15 for the thinnest layer (20μ) and 0.15–0.30 for layers about 40 μ thick.
When the thickness of the coating is increased, grabbing begins at lower pressures (80 kg/cm2 and the friction coefficient increases to 0.3–0.4.
When nickel-coated titanium is fitted to a surface of unhardened titanium the pressure at which grabbing occurs is about 80–100 kg/cm2 and the friction coefficient is 0.15–0.35.
Galvanic coatings of chromium, etc., can easily be deposited on titanium coated with nickel.
KeywordsTitanium Nickel Chromium Thin Layer Friction Coefficient
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