Aluminum slurry coatings to replace cadmium for aeronautic applications

SURFACE & COATINGS TECHNOLOGY

卷:213

Article

Agueero, A.¹  del Hoyo, J. C.¹  Garcia de Bias, J.¹  Garcia, M.¹  Gutierrez, M.¹  Madueno, L.¹  Ulargui, S.¹ 

[1] INTA, Area Mat Met, Madrid 28850, Spain

关键词: Cadmium coating replacement;    Aluminum slurry;    Steel;    Atmospheric corrosion;    Aeronautical applications;   

DOI  :  10.1016/j.surfcoat.2012.10.052

来源: Elsevier

【 摘 要 】

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. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

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