Patent ID: 6197436
Filing Date: 2001-03-06
Classification: C23C,Y10T

Abstract:
A method for forming a coating on a ferrous workpiece comprising the steps of:a) forming a mixture from components including approximately 40-50 wt % chromium, approximately 25-37 wt % ferrochromium, approximately 4-5 wt % ammonium chloride, approximately 0.40-0.65 wt % tantalum carbide, approximately 0.35-0.70 wt % vanadium, and aluminum oxide, the sum of all the components being 100 wt %;b) exposing the ferrous workpiece to the mixture; andc) heating the ferrous workpiece and the mixture to form a substantially pore free, chromium carbide containing corrosion resistant layer having a Vickers' hardness of about 1550 Kg/mm.sup.2 or greater.