The Localised Corrosion Associated with Individual Second Phase Particles in AA7075-T6: A Study by SEM, EDX, AES, SKPFM and FIB-SEM

Mallinson, Christopher, Yates, PM, Baker, Mark, Castle, James, Harvey, A and Watts, John (2017) The Localised Corrosion Associated with Individual Second Phase Particles in AA7075-T6: A Study by SEM, EDX, AES, SKPFM and FIB-SEM Materials and Corrosion, 68 (7). pp. 748-763.

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Abstract

To investigate the role of intermetallic particles in the localised corrosion of AA7075-T6, three particles were monitored over 16 hours immersion in 3.5 wt.% KCl solution. These were examined using Auger electron spectroscopy, energy dispersive x-ray spectroscopy, scanning Kelvin probe force microscopy and focused ion beam-scanning electron microscopy. Despite similar Volta potential measurements, the corrosion microchemistry varied significantly with composition. A Al7Cu2Fe intermetallic resulted in trenching while a (Al,Cu)6(Fe,Cu) intermetallic showed crevice corrosion and sub-surface intergranular corrosion and a Al12Fe3Si intermetallic appeared to be galvanically inactive but showed crevice formation at the matrix interface and sub-surface intergranular corrosion.

Item Type:	Article
Subjects :	Mechanical Engineering Science
Divisions :	Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :	Name Email ORCID Mallinson, Christopher c.mallinson@surrey.ac.uk Yates, PM Baker, Mark M.Baker@surrey.ac.uk Castle, James J.Castle@surrey.ac.uk Harvey, A Watts, John J.Watts@surrey.ac.uk
Date :	30 January 2017
DOI :	10.1002/maco.201609312
Copyright Disclaimer :	This is the peer reviewed version of the following article: Mallinson CF, Yates PM, Baker MA, Castle JE, Harvey A, Watts JF. The localised corrosion associated with individual second phase particles in AA7075-T6: A study by SEM, EDX, AES, SKPFM and FIB-SEM. Materials and Corrosion. 2017; 68:748–763. 10.1002/maco.201609312, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/maco.201609312/full. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Uncontrolled Keywords :	Aluminium alloy, Intermetallics, AES, SEM, Pitting corrosion
Depositing User :	Symplectic Elements
Date Deposited :	14 Dec 2016 12:29
Last Modified :	16 Jan 2019 17:10
URI:	http://epubs.surrey.ac.uk/id/eprint/813108

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