Coating compositions containing nickel and boron
AssigneeMcComas Industries International
InventorC. Edward McComas
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Abstract
The invention is directed to corrosion and wear resistant metallic coatings containing nickel, boron, and thallium. The coatings are preferably deposited on catalytically active substrates from an electroless coating bath containing nickel ions, a mixture of thallium nitrate and thallium sulfate as a stabilizer, a metal ion complexing agent, and a borohydride reducing agent, at a pH of about 10 to about 14.
Claims31
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) about 0.175 to about 2.10 moles per gallon of coating bath of nickel ions;
- (2) about 0.0508 to about 0.11872 grams per gallon of a mixture containing thallium nitrate and thallium sulfate as a stabilizer wherein the percentage of thallium nitrate in the mixture is less than 50% of the combined weight of the thallium nitrate and thallium sulfate
- (3) an effective amount of 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.
The coating bath of claim 6 wherein the borohydride reducing agent is selected from the group consisting of sodium borohydride, potassium borohydride, sodium trimethoxyborohydride, and potassium trimethoxyborohydride.
A concentrate containing about 28 to about 37 grams per gallon of mixture containing thallium sulfate and thallium nitrate, wherein the percentage of thallium nitrate in the mixture is less than 50% of the combined weight of the thallium nitrate and thallium sulfate.
Dependencies are inferred from the claim text.