Abstract
SummaryThe mechanisms involved in electrophoretic deposition of organic coatings on aluminium are studied by re-anodizing porous oxide films in (a) barrier-type electrolytes, (b) a sodium oleate bath and (c) a water soluble acrylic resin. Reactions found to occur in barrier electrolytes are formation of a thicker barrier layer at the metal/oxide interface, and enhancement of the barrier layer at the oxide/solution interface by ‘pore-filling’. In the oleate bath there is additionally oleic acid deposition brought about by the hydrogen released from water decomposition. When porous oxide film is polarised in the resin bath there are four reactions: deposition of acrylic resin by anodically dissolved Al3 +; formation of the thicker barrier layer; generation of hydrogen ions by decomposition of water; neutralisation of the anionic resin by the released hydrogen which plays an esential part. Additives to or impurities in the resin are shown to play an important part and it is considered that electrical breakdo...
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