Protective metal oxide films on metal or alloy substrate surfaces susceptible to coking, corrosion or catalytic activity
AssigneeThe British Petroleum Company p.l.c.
InventorsAlan I. Foster, Malcolm L. Sims, Dennis Young
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Abstract
This case relates to a process for forming protective metal oxide films on metal or alloy substrate surfaces susceptible to coking, corrosion or catalytic activity. The process comprises first preoxidizing the substrate surface and then depositing on the pre-oxidized surface a metal oxide of Ca, Mg, Al, Ga, Ti, Zr, Hf, Ta, Nb or Cr by vapor phase decomposition of a volatile compound of the metal which has at least one metal-oxygen bond. Nitrogen, helium, argon, carbon dioxide, air or steam may be used as carrier gases for the metal compound.
Claims14
A process for forming protective films on a structural metal or alloy substrate surface which comprises first pre-oxidising the surface at an elevated temperature in an oxidixing atmosphere and then depositing on the preoxidised substrate surface a film of a high temperature stable, non-volatile oxide of a metal selected from calcium, magnesium, aluminium, gallium, titanium, zirconium, hafnium, tantalum, niobium and chromium by thermal decomposition from the vapour phase of a volatile compound of the metal having at least one metal-oxygen bond in admixture with an inert or oxygenated carrier gas in contact with the pre-oxidised surface.
Dependencies are inferred from the claim text.