Coating processes – Direct application of electrical – magnetic – wave – or... – Pretreatment of substrate or post-treatment of coated substrate
Patent
1992-12-04
1993-12-14
Beck, Shrive
Coating processes
Direct application of electrical, magnetic, wave, or...
Pretreatment of substrate or post-treatment of coated substrate
427535, 427597, 427250, 4273766, 4273767, 4273768, 427405, 20419216, 205255, 205271, B05D 306
Patent
active
052700810
ABSTRACT:
A structural component made of an iron-base alloy is protected against corrosion by a coating which is produced to have three layers. First, a primary coating or first layer is applied, and then a top coating or second layer is applied. An intermediate layer is formed by a reaction between the first and second layers. Specifically, the intermediate layer is formed after application of the primary coating and of the top coating, by a heat treatment within a reaction temperature range in which intermetallic nickel aluminum or cobalt aluminum compounds are formed. A fourth sealing coat is optional. The primary coating is a nickel or cobalt coating. The intermediate layer comprises intermetallic compounds of nickel aluminide or cobalt aluminide formed by the reaction. The top coating is an aluminum base or aluminum alloy base high-temperature lacquer including a binder. Such a combination coating is especially resistant to fretting, oxidation and etching corrosion. The so coated component is suitable especially as a part for gas turbine engine housings.
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Manier Karl-Heinz
Wydra Gerhard
Beck Shrive
Fasse W. G.
MTU Motoren-und Turbinen-Union Muenchen GmbH
Utech Benjamin L.
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