Istituto di Scienze Marine     
Traverso P., Beccaria A. M. Effect of magnesium ions on the protective power of corrosion products formed on the surface of Al 6061 T6 alloy-10% Al2O3 (v/v) composite in solutions containing chlorides. In: Surface and Interface Analysis, vol. 26 (7) pp. 524 - 530. Wiley, 1998.
An XPS study of corrosion products formed in seawater and in NaCl solutions on the surface of Al 6061 T6 alloy-10% Al2O3 (v/v) composite was carried out in order to investigate the influence of chloride and magnesium ions (coming from corrosive solutions) and inhomogeneity of the metallic matrix due to the presence of inter-metallic compounds segregated at the grain boundaries. Potentiodynamic polarization tests were carried out to evaluate Al composite resistance to both general and localized attack. Large- and small-area XPS analyses were performed to obtain qualitative and quantitative characterization of corrosion layers. The distribution of the most interesting components of corrosion layers was observed with the Auger technique. The results of electrochemical tests, indicating that specimens immersed in NaCl solutions have a lower pitting corrosion resistance, were correlated with the composition of the corrosion layers, showing higher content in Cl compounds where localized corrosion takes place and higher resistance to corrosion where magnesium compounds are co-precipitated with aluminium corrosion compounds.
URL: http://dx.doi.org/10.1002/(SICI)1096-9918(199806)26:7<524::AID-SIA401>3.0.CO;2-V
Subject corrosion
aluminium matrix composite
chloride solutions

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