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Metals 2015, 5(1), 172-191; doi:10.3390/met5010172

Effect of Strain Localization on Pitting Corrosion of an AlMgSi0.5 Alloy

Technische Universität Chemnitz, Professur Oberflächentechnik/Funktionswerkstoffe, 09107 Chemnitz, Germany
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Heinz Werner Höppel
Received: 8 December 2014 / Revised: 12 January 2015 / Accepted: 29 January 2015 / Published: 3 February 2015
(This article belongs to the Special Issue Ultrafine-grained Metals)
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Abstract

The corrosion susceptibility of an age-hardened aluminum alloy in different processing conditions, especially after a single pass of equal-channel angular pressing (ECAP), is examined. The main question addressed is how corrosive attack is changed by strain localization. For that purpose, an AlMgSi0.5 alloy with a strain localized microstructure containing alternating shear bands was subjected to potentiodynamic polarization on a macro-scale and micro-scale using the micro-capillary technique. Pitting potentials and the corrosion appearance (pit depth, corroded area fractions and volumes) are discussed with respect to microstructural evolution due to casting, extrusion and ECAP. Size, shape and orientation of grains, constituent particle fragmentation, cell size and microstrain were analyzed. Stable pitting of shear bands results in less positive potentials compared to adjacent microstructure. More pits emerge in the shear bands, but the pit depth is reduced significantly. This is attributed to higher microstrains influencing the stability of the passivation layer and the reduced size of grains and constituent particles. The size of the crystallographic pits is associated with the deformation-induced cell size of the aluminum alloy. View Full-Text
Keywords: AlMgSi0.5 alloy; ECAP; pitting corrosion; micro-capillary cell; deformation localization AlMgSi0.5 alloy; ECAP; pitting corrosion; micro-capillary cell; deformation localization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Nickel, D.; Dietrich, D.; Mehner, T.; Frint, P.; Spieler, D.; Lampke, T. Effect of Strain Localization on Pitting Corrosion of an AlMgSi0.5 Alloy. Metals 2015, 5, 172-191.

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