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Observations on the Early Stages of Corrosion on AA2099-T83

Published online by Cambridge University Press:  09 June 2020

A. Matthew Glenn ,
Anthony E. Hughes ,
Colin M. MacRae Open the ORCID record for Colin M. MacRae [Opens in a new window] ,
Nicholas C. Wilson Open the ORCID record for Nicholas C. Wilson [Opens in a new window] ,
Aaron Torpy  and
Xiaorong Zhou
A. Matthew Glenn
Affiliation:
CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169 VIC, Australia
Anthony E. Hughes*
Affiliation:
CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169 VIC, Australia Institute of Frontier Materials, Deakin University, 221 Burwood Highway, Burwood, VIC 3125, Australia
Colin M. MacRae
Affiliation:
CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169 VIC, Australia
Nicholas C. Wilson
Affiliation:
CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169 VIC, Australia
Aaron Torpy
Affiliation:
CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169 VIC, Australia
Xiaorong Zhou
Affiliation:
Corrosion and Protection Centre, School of Materials, The University of Manchester, ManchesterM13 9PL, UK
*
*Author for correspondence: Anthony E. Hughes, E-mail: tony.hughes@csiro.au
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Abstract

An Al–Cu–Li aerospace alloy has been investigated to determine the order in which corrosion at different types of sites occurs in AA2099-T83. Specifically, the sequence of galvanic attack on intermetallic (IM) particles and other sites of AA2099-T83 was determined as a function of time, in 0.1 M NaCl, through the use of scanning electron microscopy and electron backscatter diffraction characterization techniques. The earliest attack occurred at isolated grains and grain boundaries and on Li-containing dispersoids. Similarly, some constituent IM particles showed evidence of trenching in the surrounding alloy matrix. These IM particles included Al7Cu2Fe and another group of unidentified particles which displayed complete trenching within the first 10 min of exposure. Al13(Fe, Mn)4 were next most active followed by Al37Fe12Cu2 with Al6(Fe,Mn) and large TiB2 particles being the least active.

Keywords

AA2099-T83corrosionelectron microprobeEBSD
Type
Australian Microbeam Analysis Society Special Section AMAS XV 2019
Information
Microscopy and Microanalysis , Volume 26 , Issue 4 , August 2020 , pp. 821 - 836
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Copyright
Copyright © Microscopy Society of America 2020

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