Coating compositions containing nickel and boron and particles
OwnerEdward McComasinventor
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Abstract
The invention is directed to corrosion and wear resistant metallic coatings containing nickel, boron, particles. The coatings are preferably deposited on catalytically active substrates from an electroless coating bath containing nickel ions, a stabilizer, a metal ion complexing agent, particles and a borohydride reducing agent, at a pH of about 10 to about 14.
Claims28
A coating bath for providing a hard, wear and corrosion resistant, ductile coating on a substrate, said bath having a pH of about 10 to about 14 and comprising
- (1) an effective amount of nickel ions,
- (2) an effective amount of a stabilizer,
- (3) an effective amount of a metal ion complexing agent in an amount sufficient to inhibit precipitation of said metal ions from the coating bath,
- (4) an effective amount of a borohydride reducing agent,
- (5) optionally other metal ions;
- and
- (6) an effective amount of an alkaline dispersing composition comprising particles and a mixture of a water soluble salt of ethylenediamine tetraacetic acid (EDTA) and ethylenediamine (EDA).
An aqueous dispersing composition having a pH greater than 10 comprising a mixture of a water soluble salt of EDTA and EDA and particles wherein the concentration ranges are from about 35% to about 75% by volume EDA and from 10% to about 35% by volume of the water soluble salt of EDTA.
A concentrate comprising a mixture of a water soluble salt of EDTA and EDA wherein the volumetric concentration ranges of EDA and the water soluble salt of EDTA upon dilution provides about 35% to about 75% by volume EDA and from 10% to about 35% by volume the water soluble salt of EDTA.
An nickel boron alloy coating having particles dispersed through the coating where in the volumetric amount of the particles in the coating is 37½% or less.
Dependencies are inferred from the claim text.