The Production of Coloured Anodic Films without the use of Dyestuffs

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Abstract
A full investigation has been made into the methods of obtaining coloured anodised aluminium by means of inorganic pigments and by some sealing treatments. The mechanism of absorption of inorganic pigments by the pores of the anodic film is discussed, and it is concluded that to obtain uniform colours it is necessary to control very carefully all the variables in the anodising and colouring techniques. The majority of the colours described were subjected to both natural exposure and accelerated weathering tests, and some of the inorganic pigments were assessed by direct corrosion of coloured anodised panels in salt water. It was concluded that the most durable, light-fast pigments in the range of the present investigation are copper sulphide,§ ferric oxide, lead chromate, and prussian blue sealed in dichromate.

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