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Ralston, K. D.
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Publications (7/7 displayed)
- 2013Influence of Surface Mechanical Attrition Treatment Attrition Media on the Surface Contamination and Corrosion of Magnesiumcitations
- 2012Impact of ultrafine-grained microstructure on the corrosion of aluminium alloy AA2024citations
- 2011Achieving a chromium rich surface upon steels via FBR-CVD chromising treatmentscitations
- 2011Enhanced corrosion resistance of Mg alloy ZK60 after processing by integrated extrusion and equal channel angular pressingcitations
- 2011Effect of processing on grain size and corrosion of AA2024-T3citations
- 2010Grain character influences on corrosion of ECAPed pure magnesiumcitations
- 2009Electrochemical Evaluation of Constituent Intermetallics in Aluminum Alloy 2024-T3 Exposed to Aqueous Vanadate Inhibitorscitations
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article
Influence of Surface Mechanical Attrition Treatment Attrition Media on the Surface Contamination and Corrosion of Magnesium
Abstract
Surface mechanical attrition treatment (SMAT) is a mechanical peening process used to generate ultrafine grain surfaces on a metal. SMAT was carried out on pure magnesium using different attrition media (zirconia [ZiO2], alumina [Al2O3], and steel balls) to observe the effect on microstructure, surface residual stress, surface composition, and corrosion. Surface contamination from SMAT was characterized using glow discharge optical emission spectroscopy (GDOES). The SMAT process produced a refined grain structure on the surface of Mg but resulted in a region of elemental contamination extending ~10 ?m into the substrate, regardless of the media used. Consequently, SMAT-treated surfaces showed an increased corrosion rate compared to untreated Mg, primarily through increased cathodic kinetics. This study highlights the issue of contamination resulting from the SMAT process, which is a penalty that accompanies the significant grain refinement of the surface produced by SMAT. This must be considered if attempting to exploit grain refinement for improving corrosion resistance.