Effects of deformations on corrosion of Al-Mn alloys

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http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/266 http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/266 http://eprints.org/relation/isIndexCodesVersionOf http://etheses.bham.ac.uk/id/document/266 archive 4031 disk0/00/00/01/08 2008-05-12 13:13:43 2019-01-23 09:51:32 2011-07-19 16:12:52 thesis show 0 Namahoot Jutatip jutatipn@nu.ac.th Davenport Alison University of Birmingham Effects of deformations on corrosion of Al-Mn alloys unpub TN 30sch_engi Corrosion, Aluminium alloys, Al-Mn alloys, AA 3XXX, Deformation, ECAE, Surface preparation, Active surface layers. Wrought Al-Mn alloys can develop a thin deformed layer on the surface as a result of hot and cold rolling. Subsequent heat-treatment precipitates fine secondary intermetallic particles which effect corrosion susceptibility. This work focuses on the effect of surface preparation and deformation on the electrochemical behaviour of Al-Mn alloys. The first part of the work investigated the effect of surface preparation such as mechanical grinding and polishing, alkaline etching and desmutting, and nitric acid treatment on electrochemical behaviour of an Al-1Mn-0.4Fe-0.3Si model alloy. Different surface preparations of this alloy show different electrochemical behaviour. In the second part of the work, the electrochemical reactivity of the surface layers of commercial rolled AA3005 sheet was investigated by profiling through the surface with GDOES (glow discharge optical emission spectroscopy). The microstructure and electrochemical reactivity was examined at different depths in order to compare the behaviour of the surface layers with that of the bulk alloy. In order to understand the role of deformation on corrosion behaviour of Al-Mn alloy, an Al-1Mn-0.4Fe-0.3Si model alloy was deformed by uniaxial compression and equal channel angular extrusion (ECAE) and followed by annealing. It was found that deformation is likely to have two effects on the surface of Al-Mn alloy. One effect is to cause the precipitation of particles that act as local cathodes and pit initiation sites. The other effect is that formation of precipitates will deplete the adjacent matrix in solute, making it more susceptible to dissolution. 2005-07-11 graduation 2421726 eng author checked This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder. Government of Thailand public 182 University of Birmingham School of Metallurgy and Materials d_ph other 2005-07-11 graduation