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Empresa Nacional del Aluminio SA ENDASA
Original Assignee
Empresa Nacional del Aluminio SA ENDASA
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Application filed by Empresa Nacional del Aluminio SA ENDASAfiledCriticalEmpresa Nacional del Aluminio SA ENDASA
Priority to ES548597ApriorityCriticalpatent/ES8701859A1/en
Publication of ES8701859A1publicationCriticalpatent/ES8701859A1/en
Publication of ES548597A0publicationCriticalpatent/ES548597A0/en
The process consists of a thermal treatment which causes formation of precipitates semi-coherent with the Al matrix, and soln., of the precipitates by acid treatment. The alloy is subject to ageing, washed and stripped. It is then neutralised in an acid bath to obtain the surface state which determines the grey shade desired for final sealing.
ES548597A1985-11-061985-11-06Grey colouration of anodic layers on aluminium (alloys)
ExpiredES8701859A1
(en)