Passivation of Al–Cr–Fe and Al–Cu–Fe–Cr complex metallic alloys in 1 M H2SO4 and 1 M NaOH solutions
Ewa Ura-Bińczyk , Nadzeya Homazava , Andrea Ulrich , Roland Hauert , Małgorzata Lewandowska , Krzysztof Kurzydłowski , Patrik Schmutz
AbstractThe corrosion mechanisms of Al–Cr–Fe and Al–Cu–Fe–Cr complex metallic alloys have been investigated by potentiodynamic and potentiostatic polarization. Very good passivation of the Al–Cr–Fe surface is exhibited from 1 M H2SO4 to 1 M NaOH solutions, which was confirmed by ICP-OES analysis over a period of 273 days. Potentiostatically formed passive films analysed by XPS revealed chromium enrichment in the outermost layer of the aluminium oxy-hydroxide film. Although Al–Cu–Fe–Cr showed passivation during potentiodynamic polarization, heavy active corrosion at OCP was revealed by ICP-OES. For the Al–Cu–Fe–Cr alloy, the 10\% content of Cr is insufficient to maintain a protective “chemically stable” Cr oxide/hydroxide.
|Journal series||Corrosion Science, ISSN 0010-938X|
|Keywords in English||A. Aluminium alloys, A. Complex metallic Alloys, B. Electrochemical polarization, B. ICP-MS, B. XPS, C. Passivity|
|Publication indicators||: 2011 = 3.734 (2) - 2011=3.729 (5)|
|Citation count*||15 (2015-04-27)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.