Patent ID: 7255894

Claim:
A method of manufacturing a component for use at elevated temperature in an oxidising and/or corrosive environment, in particular in a cell for the electrowinning of aluminium, comprising: applying onto a metal-based substrate one or more layers of a particle mixture containing iron oxide particles and particles of one or more reactant-oxides of at least one metal selected from titanium, yttrium, ytterbium and tantalum; and heat treating the applied layers to consolidate by reactive sintering of the iron oxide particles and the reactant-oxide(s) particles to turn the applied layer(s) into a protective coating made of a substantially continuous reacted oxide matrix of one or more multiple oxides of iron and the metal(s) of the metal reactant-oxide(s), the metal-based substrate comprising at its surface during the heat treatment one or more integral anchorage-oxides of at least one metal of the substrate, the anchorage-oxide(s) anchoring the multiple oxide matrix to the substrate by reacting with the iron oxide particles and/or the reactant-oxide(s) particles to form an integral multiple bonding oxide of the metal(s) of the integral anchorage-oxide(s) and iron from the iron oxide and/or the metal(s) of the reactant-oxide(s).