Protecting a substrate with a multilayer oxide/phosphate coating having a temperature-stepped cure
AssigneeGeneral Electric Company
InventorsMichael James Weimer, Joseph Aloysius Heaney, Bangalore Aswatha Nagaraj, James Andrew Hahn
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Abstract
A substrate is protected by a multilayer protective coating having an oxide layer, and a phosphate/organic binder layer initially overlying the oxide layer. The multilayer protective coating is cured by first degassing the multilayer protective coating in a pre-cure degassing temperature range of from about 250° F. to about 500° F. for a time of at least about 30 minutes. The multilayer protective coating is thereafter heated to a curing temperature range of from about 1200° F. to about 1400° F. for a time of at least about 30 minutes.
Claims14
A method for protecting a substrate, comprising the steps of
- providing a substrate;
- applying a multilayer protective coating to the substrate to form an initially coated substrate, the multilayer protective coating comprising
- an oxide layer comprising oxide particles in an oxide-layer binder, and
- a phosphate layer overlying the oxide layer, the phosphate layer comprising a phosphate in a binder;
- and
- curing the multilayer protective coating by
- degassing the multilayer protective coating of the initially coated substrate in a pre-cure degassing temperature range of from about 250° F. to about 500° F. for a time of at least about 30 minutes, and thereafter
- heating the multilayer protective coating to a curing temperature range of from about 1200° F. to about 1400° F. for a time of at least about 30 minutes.
A method for protecting a substrate, comprising the steps of
- providing a substrate;
- applying a multilayer protective coating to the substrate to form an initially coated substrate, the multilayer protective coating comprising
- an aluminum oxide sublayer overlying and contacting the substrate, the aluminum oxide sublayer comprising aluminum oxide particles in an aluminum-oxide sublayer phosphate binder,
- a chromium oxide sublayer overlying and contacting the aluminum oxide sublayer, the chromium oxide sublayer comprising chromium oxide particles in a chromium oxide sublayer phosphate binder, and
- a phosphate layer overlying and contacting the chromium oxide sublayer, the phosphate layer comprising a phosphate in a binder;
- and
- curing the multilayer protective coating by
- degassing the multilayer protective coating of the initially coated substrate in a pre-cure degassing temperature range of from about 250° F. to about 500° F. for a time of at least about 30 minutes, and thereafter
- heating the multilayer protective coating to a curing temperature range of from about 1200° F. to about 1400° F. for a time of at least about 30 minutes.
Dependencies are inferred from the claim text.