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Open Access research which pushes advances in bionanotechnology

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SIPBS is a major research centre in Scotland focusing on 'new medicines', 'better medicines' and 'better use of medicines'. This includes the exploration of nanoparticles and nanomedicines within the wider research agenda of bionanotechnology, in which the tools of nanotechnology are applied to solve biological problems. At SIPBS multidisciplinary approaches are also pursued to improve bioscience understanding of novel therapeutic targets with the aim of developing therapeutic interventions and the investigation, development and manufacture of drug substances and products.

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Corrosion behaviour and characterisation of iron in hot flowing Bayer liquors

Lu, Q and Stack, M M and Wiseman, C R (2000) Corrosion behaviour and characterisation of iron in hot flowing Bayer liquors. Materials and Corrosion-Werkstoffe und Korrosion, 51 (10). pp. 705-711. ISSN 0947-5117

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Abstract

The flow-induced corrosion of iron, in spent Bayer liquor at high temperatures, was investigated using a rotating cylinder electrode (RCE) in an autoclave facility. A temperature range of 100 degreesC to 230 degreesC and equivalent pipe velocities between 0.84 ms(-1) to 3 ms(-1) were used in this work. Techniques, such as, weight loss, ac impedance, potential measurements and electron microscopy were used to characterise corrosion behaviour during the experiments and also any surface corrosion products formed. Corrosion rates measured by weight loss were in good agreement with those obtained through ac impedance measurements. The results showed evidence of a peak in the corrosion rate with increasing temperature for iron. Such peaks were also observed as a function of increasing velocity. The effects of these variables were demonstrated by constructing a corrosion map in which regions of "high", "medium" and "low" corrosion rate for the material, under specific conditions, were identified. This method may be a useful way of providing a guide to optimise the process conditions when using materials in high temperature alkaline flowing environments such as those found in Bayer plants.