ZINC-DIFFUSED ALLOY COATING FOR CORROSION/HEAT PROTECTION

摘要

PURPOSE: A coating which provides both heat and atmospheric corrosion protection is provided, and a method for forming the coating is provided. CONSTITUTION: The method for forming a corrosion and heat protective coating on a substrate(12) comprises the steps of forming a nickel base coating layer(16) on the substrate; applying a layer of zinc(18) over the nickel base coating layer; and forming a diffused alloy layer(10) by diffusing the zinc into the nickel base coating layer, wherein the diffusing step comprises carrying out a thermal diffusion cycle in at least one of an atmospheric and an inert gas oven at a temperature in the range of 600 to 800 deg.F for a time of at least 100 minutes.