Cadmium has been widely used as a coating to provide protection against galvanic corrosion for steels and for its natural lubricity on threaded applications. However, it is a toxic metal and a known carcinogenic agent, which is plated from an aqueous bath containing cyanide salts. For these reasons, the use of cadmium has been banned in Europe for most industrial applications. However, the aerospace industry is still exempt due to the stringent technical and safety requirements associated with aeronautical applications, as an acceptable replacement is yet to be found. Al slurry coatings have been developed as an alternative to replace cadmium coatings. The coatings were deposited on AISI 4340 steel and have been characterized by optical and electron microscopy. Testing included salt fog corrosion exposure, fluid corrosion exposure (immersion), humidity resistance, coating-substrate and paint-coating adhesion, electric conductivity, galvanic corrosion, embrittlement and fatigue. The results indicated that Al slurry coatings are an excellent alternative for Cd replacement.


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    Title :

    Aluminum slurry coatings to replace cadmium for aeronautic applications


    Additional title:

    Aluminiumschlickerbeschichtungen ersetzen Cadmium bei aeronautischen Anwendungen


    Contributors:
    Agüero, A. (author) / del Hoyo, J.C. (author) / Garcia de Blas, J. (author) / Garcia, M. (author) / Gutierrez, M. (author) / Madueno, L. (author) / Ulargui, S. (author)

    Published in:

    Publication date :

    2012


    Size :

    10 Seiten, 34 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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