Iron-base alloy structural component having a corrosion-inhibiti

Details Iron-base alloy structural component having a corrosion-inhibiti Iron-base alloy structural component having a corrosion-inhibiti

1991-01-28

1993-08-17

Zimmerman, John

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428652, 428679, 416219R, 277235A, F01D 530, B32B 1508

Patent

active

052367886

ABSTRACT:
A structural component made of an iron-base alloy is provided with a corrosion inhibiting coating which has three layers, namely a primary coating or layer, an intermediate layer, and a top coating or layer. 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. 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 etch corrosion. The component is suitable especially for parts of gas turbine engine housings. 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.

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