Short notice given only, substantially as follows: A wire arc sprayed aluminium coating has been developed to protect liquid hydrogen ducts of the Space Shuttle main engine from corrosion, replacing the chromate primer used to protect many aerospace components, which is under pressure from environmental legislation relating to hexavalent chromium and volatile organic compounds. The coating is reported to meet adhesion and cryogenic flexibility requirements and has good potential to provide protection against pitting and stress corrosion protection induced by the cryogenic service environment. The arc sprayed coating was selected on the basis of cost, environmental impact, availability, and performance. Aluminium was chosen for its proven protective properties, including galvanic protection of steel, and its high adhesive strength. When combined with a sealant or top coat, the coating is said to have long life and to be easy to maintain. High temperatures in the arc zone during wire spraying ensure good coating adherence and cohesion, while the use of an arc reduces heat input to the substrate relative to comparable flame spraying process.
Cryogenic corrosion protection
Schutz vor kryogener Korrosion
British Corrosion Journal ; 31 , 3 ; 166
1996
1 Seite
Aufsatz (Zeitschrift)
Englisch
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