The influence of heat treatment on corrosion behavior of magnesium-aluminum (Mg-9Al) alloys was investigated by studying the electrochemical properties of Mg-9Al in the solution-treated (T4) and artificially aged (T6) conditions. The alloys' properties were compared to those of pure Mg, the intermetallic Mg 17 Al 12 phase, and different Mg-Al-based alloys (Mg-3Al, AZ91). The Mg-9Al alloy exhibited better corrosion resistance in the T6 condition than in the T4 condition because of the intermetallic Mg 17 Al 12 precipitates present in the T6 alloy. The mechanism responsible for this behavior was attributed to a more protective porous film on the T6 matrix alloy than on the T4 alloy. Addition of zinc did not modify these results. Localized corrosion testing showed the Mg-Al alloys were attacked preferentially in relation to magnesium silicide (Mg 2 Si) precipitates which were characterized clearly using metallurgical examinations.
T his paper presents research results obtained in the to be very close to those f rom excavations. As a consequence the patinated specimens can be used as a 4th Framework Programme (1994-1998) of the substitute for genuine artefacts in the future to improve Standards, Measurements, and T esting Programme of conservation techniques. SE/S193 the European Union, DG XII: 'Improvement of means of measurements on archaeological copper alloys for Dr Beldjoudi is with Step S.A., 3 Place des Pianos, characterisation and conservation' (IMMACO) project. 93200 Saint-Denis, France, Ms Bardet and One of the aims of this project was to study copper Mr L acoudre are with EDF, Groupe des L aboratoires, alloy compositions of European objects dating f rom the L aboratoire Valectra, 2 rue Ampère, 93206 Saint-Bronze Age to Roman times. T his work has revealed Denis, Cedex 1, France, Dr Andrieu is at ENSAM, that five types of alloy seem to be particularly L M3,
The effect of inorganic inhibiting anions of the XO y n "type has been studied on the corrosion behaviour of Mg and AZ91E alloy in relation to the effect of the pH of the solution. The electrochemical behaviour (I-E curves) was investigated in 0.5M Na 2 S0 4 aqueous solution at room temperature. The corroded surfaces were characterised in order to determine the structure and the composition of the corrosion products (SEM, X-ray microanalysis, IRS).Results showed that in alkaline conditions, a major inhibiting effect was observed for Si0 3 2 " in relation with the presence of Al at the surface and, in neutral conditions, Cr0 4 2 " had an inhibiting effect mainly related to the protection of the Mg component.
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