Aluminium and its alloys have excellent corrosion resistance. When aluminium is exposed to the atmosphere, a thin invisible oxide Al2O3 is formed, protecting the metal from further oxidation. Compared to pure metals, alloys can have higher corrosion resistance depending on the content of certain alloying elements. Various substances such as organic or inorganic inhibitors can affect the corrosion of aluminium alloys and thus slow down the degradation of the material. In this paper, we studied the inhibitory effect of potassium dichromate on the corrosion processes of aluminium alloy. All measurements were performed in 0.5 M sodium chloride solution with the addition of different concentrations of inhibitors. The methods used were potentiodynamic polarization, cyclic voltammetry, and chronoamperometry.
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