Coating method for improving oxidation and corrosion resistance of stainless steels
First Claim
1. A method for coating stainless steel comprising the steps of:
- forming a mixture of an aqueous solution of at least one metal salt and polyethylene glycol;
applying said mixture to a stainless steel substrate;
heating said stainless steel substrate to a temperature suitable for evaporating water, resulting in evaporation of water from said mixture disposed on said stainless steel substrate and forming a layer of said polyethylene glycol and said metal salt; and
heating said stainless steel substrate to a temperature suitable for vaporizing said polyethylene glycol, resulting in vaporization of said polyethylene glycol and decomposition of said at least one metal salt into metal oxide particles.
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Accused Products
Abstract
A method for improving the oxidation and corrosion resistance of stainless steels used in high temperature gaseous and/or molten salt environments in which a protective coating is applied to the stainless steel. The coating is applied by forming a mixture of an aqueous solution of at least one metal salt and polyethylene glycol and applying the mixture to a stainless steel substrate. The coated stainless steel substrate is heated to a temperature suitable for evaporating water, resulting in evaporation of water from the mixture disposed on the stainless steel substrate and formation of a layer of the polyethylene glycol and the metal salt. The stainless steel substrate is then heated to a temperature suitable for vaporizing the polyethylene glycol, resulting in vaporization of the polyethylene glycol and decomposition of the at least one metal salt into nanometer-size metal oxide particles. The metal oxide particles are then sintered, forming a dense metal oxide layer on the stainless steel substrate.
10 Citations
22 Claims
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1. A method for coating stainless steel comprising the steps of:
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forming a mixture of an aqueous solution of at least one metal salt and polyethylene glycol;
applying said mixture to a stainless steel substrate;
heating said stainless steel substrate to a temperature suitable for evaporating water, resulting in evaporation of water from said mixture disposed on said stainless steel substrate and forming a layer of said polyethylene glycol and said metal salt; and
heating said stainless steel substrate to a temperature suitable for vaporizing said polyethylene glycol, resulting in vaporization of said polyethylene glycol and decomposition of said at least one metal salt into metal oxide particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for coating stainless steel comprising the steps of:
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mixing an aqueous continuous phase comprising at least one metal salt with a hydrophilic organic polymeric disperse phase, forming a metal cation/polymer gel;
applying said metal cation/polymer gel to a stainless steel substrate, forming a metal cation/polymer gel coated stainless steel substrate;
heating said metal cation/polymer gel coated stainless steel substrate to a temperature suitable for evaporating water, resulting in evaporation of water from said metal cation/polymer gel and formation of a polymer gel/metal salt coated stainless steel substrate comprising a layer of said polymer gel and said at least one metal salt; and
heating said polymer gel/metal salt coated stainless steel substrate to a temperature suitable for vaporizing said polymer gel, resulting in vaporization of said polymer gel and decomposition of said at least one metal salt into metal oxide particles. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification