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The purpose is to investigate the influence of the structure of aluminium and aluminium alloys used in the transport industry on corrosion resistance in chloride medium and present the influence of the inhibition with cerium acetate - Ce(CH3COO)3.
Aluminium is very corrosion-resistant in environmental conditions, because of the formation of a protective oxide layer on the surface - passivation. But exposing aluminium to more aggressive media, such as a solution of chloride salts, passivation loses efficiency. Chloride ions penetrate through the oxide pores, react with the aluminium, and form corrosion. The same applies to aluminium alloys, which additionally include metal intermetallic consisting of copper, zinc, iron, or magnesium. Intermetallic in alloys improve the mechanical properties of the alloy, but they are often more anodic than the aluminium. Consequently, the inclusions reduce corrosion resistance and present an incisal part of the corrosion process. Corrosion protection can be improved, e.g. by inhibition of these metal inclusions. One of the possibilities is the addition of cerium ions into the corrosive media. The cerium precipitates to the aluminium or aluminium surface, thereby improving corrosion resistance.