Back to results
US 6,146,702 AGranted
Electroless nickel cobalt phosphorous composition and plating process
AssigneeEnthone-OMI, Inc.
InventorMark W. Zitko
Life of this patent
Estimating the term…
Abstract
A process is provided for enhancing the wear resistance of aluminum and other materials by depositing on the substrate a nickel, cobalt, phosphorous alloy coating using an electroless plating bath to provide a plated alloy having a cobalt content of at least about 20% by weight and a % Co/% P weight ratio of at least about 5. A preferred bath contains an effective amount of glycolic acid or salts thereof. The alloy deposit is preferably plated over a zincated aluminum substrate.
Claims14
A process for plating a substrate with a nickel, cobalt, phosphorous wear resistant alloy comprising:
- providing a substrate having a catalytic surface;
- forming a nickel, cobalt, phosphorous coating on the substrate by an electroless plating process using an electroless plating composition comprising:
- nickel ions in an amount of about 0.1 to 100 g/l;
- cobalt ions in an amount of about 0.1 to 100 g/l;
- a phosphorous containing reducing agent in an amount sufficient to reduce the nickel and cobalt ions;
- an effective amount of a complexing agent comprising glycolic acid or salts thereof;
- an effective amount of buffering agent;
- and
- an amount of a pH adjusting material to provide a pH of about 6.5 to 11;
- with the proviso that the plated alloy contain about 20% to about 70% by weight cobalt, greater than 2% to less than or equal to 9% by weight phosphorous and that the % Co/% P ratio be greater than about 5;
- and
- heat treating the plated substrate at a temperature above about 170.degree. C. to increase the hardness and wear resistance of the plated substrate.
9 more elements
Dependencies are inferred from the claim text.