Corrosion resistance of amorphous aluminium-molybdenum alloys in an acidic chloride environment |
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Authors: | M Metikoš-Hukovi? Z Gruba? N Radi? |
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Affiliation: | a Department of Electrochemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Savska 16, P.O. Box 177, 10000 Zagreb, Croatia b Department of General and Inorganic and Chemistry, Faculty of Chemical Technology, University of Split, 21000 Split, Croatia c Department of Materials Physics, Rudjer Boškovi? Institute, 10002 Zagreb, P.O. Box 180, Croatia |
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Abstract: | Pure aluminium corrodes readily in 1 M HCl solution while its supersaturated alloys with Mo, explored in this work, exhibit excellent corrosion properties due to the oxide barrier film formation on the alloy surface. The influence of Mo content in the alloy on the potential and charge distribution across the system alloy |oxide film| solution was studied in situ using dc and ac electrochemical methods. Passivity, a sudden change in electrode impedance, and the onset of secondary passivity and pitting were discussed in terms of the solute segregation, according to the solute-rich mechanism, change in the alumina structure and solid state processes connected with the transport of point defects and spatial distribution of surface charge. |
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Keywords: | A Alloy A Aluminium B EIS C Passive films C Segregation |
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