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Influence of surface mechanical attrition treatment attrition media on the surface contamination and corrosion of magnesium
journal contribution
posted on 2013-01-01, 00:00 authored by Daniel FabijanicDaniel Fabijanic, Adam Taylor, K Ralston, M Zhang, N BirbilisSurface 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 μm 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.
History
Journal
CorrosionVolume
69Issue
6Pagination
527 - 535Publisher
NACE InternationalLocation
Houston, Tex.Publisher DOI
ISSN
0010-9312eISSN
1938-159XLanguage
engPublication classification
C1 Refereed article in a scholarly journalUsage metrics
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No categories selectedKeywords
corrosiongrain sizemagnesiumpolarizationsurface mechanical attrition treatmentScience & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceINDUCED GRAIN-REFINEMENTMETAL-MATRIX COMPOSITESLOW-CARBON STEELMG ALLOYTHERMAL-STABILITYNANOMETER-SCALELAYERNANOCRYSTALLIZATIONDEFORMATIONRESISTANCE
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