POWDER COMPOSITION FOR SIMULTANEOUSLY COATING ALUMINUM AND CHROMIUM ON METAL SURFACE AND METHOD FOR COATING THE SAME

摘要

PURPOSE: A powder composition for simultaneously coating aluminum and chromium on metal surface and a method for coating the same are provided to obtain pack cementation of aluminum and chromium by freely controlling a composition of aluminum and chromium oxide, and supply economical mixed powder by using oxide powder instead of alloy powder. CONSTITUTION: A powder composition for simultaneously coating aluminum and chromium on metal surface is a mixed powder comprising an aluminum powder, a chromium oxide powder producing chromium by reacting with the aluminum powder, an activator powder activating chromium produced by the reaction and the remaining aluminum, and a filler for preventing condensation thereof. A method for simultaneously coating aluminum and chromium on metal surface comprises the process of putting the mixed powder into a heat resistant container, coating the container with metal, and simultaneously coating chromium and aluminum on the metal by sealing the container or heating the container under the inert gas or hydrogen environment at a temperature of 800 to 1200 deg.C for 1 to 30 hours.