Patent ID: 6884524
Filing Date: 2005-04-26
Classification: C23C,Y10T

Abstract:
1. A method for applying a diffusion barrier coating to a substrate comprising the steps of: providing a metal substrate; cleaning the substrate of foreign material; coating the metal substrate with a layer of chromium containing paint, said paint comprising substantially chromium, solvents, and binders; baking the layer of chromium containing paint to a temperature for a period of time sufficient to volatilize the solvents in the layer of chromium containing paint; baking the layer of chromium containing paint to a second temperature for a second period of time sufficient to volatilize the binders in the layer of chromium containing paint, the remaining layer being substantially contiguous on the substrate surface and comprising substantially chromium of sufficient thickness; heating the metal substrate and layer of chromium to a third temperature for a third period of time sufficient to diffuse the chromium into the substrate to form a diffusion chromium layer; and cooling the substrate.