Metal substrates including metal oxide nanoporous thin films and methods of making the same
OwnerMarc A. Anderson, M. Isabel Tejedor +1inventors
InventorsMarc A. Anderson, M. Isabel Tejedor, Ole Christensen
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Abstract
The present disclosure is directed to a metal-containing apparatus including a substrate member constructed of a metal that is highly resistant to pitting corrosion and wear in aggressive media. An exemplary metal-containing apparatus is a plate heat exchanger. The metal includes an oxidation layer on the surface thereof and a thin metal oxide nanoporous film on top of the oxidation layer. The nanoporous film is highly compliant and is comprised of oxygen and aluminum, titanium, silicon, zirconium and combinations thereof.
Claims13
A method of making a metal-containing apparatus, the method comprising:
- providing a substrate material constructed of a metal;
- introducing an oxidized layer on a surface of the substrate material, the oxidized layer having a thickness of less than about 200 nanometers;
- providing a sol comprising nanoparticulate γ-AlOOH, TiO2, SiO2, ZrO2, or a mixture thereof, the nanoparticulates having a primary particle size of from about 1.5 nanometers to about 50 nanometers;
- contacting the sol with the oxidized layer to provide at least one layer of the sol onto the oxidized layer;
- heating the at least one layer at a temperature of from about 60° C. to about 100° C. for a time period of from about 15 minutes to about 2 hours to produce at least one dry layer;
- and thermally sintering the at least about one dry layer to produce a nanoporous film comprising oxygen and aluminum, titanium, silicon, zirconium or a combination thereof, the nanoporous film having a thickness of less than about 1 micrometer and a porosity of from about 26% to about 80%.
Dependencies are inferred from the claim text.