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Effect of high-pressure torsion on corrosion behavior of a solution-treated Al-Mg-Sc alloy in a saline solution

Effect of high-pressure torsion on corrosion behavior of a solution-treated Al-Mg-Sc alloy in a saline solution
Effect of high-pressure torsion on corrosion behavior of a solution-treated Al-Mg-Sc alloy in a saline solution
The effect of the increase in crystalline defects in the structure generated by high-pressure torsion (HPT) on the corrosion behavior of metallic materials is not well understood. This report evaluates the influence of HPT on the corrosion behavior of a solution treated Al-3wt% Mg-0.2wt% Sc alloy in a 3.5 wt./v.% NaCl solution. The electrochemical behavior of the alloy was evaluated using cyclic polarization, electrochemical impedance spectroscopy (EIS), Mott Schottky, X-ray photoelectron spectroscopy, and chronoamperometry testing. The passive current density decreased after HPT processing, indicating a more protective oxide layer was formed on the surface of the HPT-processed alloy. Mott Schottky analysis confirmed the higher protection efficiency of the passive layer on the HPT-processed alloy. The film formed in the solution-treated alloy was a p-type and an n-type semiconductor while the alloy processed by HPT exhibited only an n-type semiconductor behavior. EIS showed that corrosion resistance in a saline medium increased with HPT processing.
aluminum alloy, corrosion, high-pressure torsion, ultrafine microstructure
1516-1439
1-8
Lage, Michelle Dias Alves
ccf50dfe-aeea-485f-82cb-e0027518db8d
Soares, Renata Braga
0f5576cd-94d5-417f-b959-0466f2a33d88
Pereira, Pedro Henrique R.
f033a8a6-ddad-4f6a-91ec-521a3358e4c2
Figueiredo, Roberto B.
184313b8-9f00-451a-bfb1-6d80a2c89b78
Lins, Vanessa Freitas C.
6e836fef-3499-4552-a635-f77e052ffb74
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Lage, Michelle Dias Alves
ccf50dfe-aeea-485f-82cb-e0027518db8d
Soares, Renata Braga
0f5576cd-94d5-417f-b959-0466f2a33d88
Pereira, Pedro Henrique R.
f033a8a6-ddad-4f6a-91ec-521a3358e4c2
Figueiredo, Roberto B.
184313b8-9f00-451a-bfb1-6d80a2c89b78
Lins, Vanessa Freitas C.
6e836fef-3499-4552-a635-f77e052ffb74
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Lage, Michelle Dias Alves, Soares, Renata Braga, Pereira, Pedro Henrique R., Figueiredo, Roberto B., Lins, Vanessa Freitas C. and Langdon, Terence G. (2019) Effect of high-pressure torsion on corrosion behavior of a solution-treated Al-Mg-Sc alloy in a saline solution. Materials Research, 22 (5), 1-8. (doi:10.1590/1980-5373-mr-2019-0343).

Record type: Article

Abstract

The effect of the increase in crystalline defects in the structure generated by high-pressure torsion (HPT) on the corrosion behavior of metallic materials is not well understood. This report evaluates the influence of HPT on the corrosion behavior of a solution treated Al-3wt% Mg-0.2wt% Sc alloy in a 3.5 wt./v.% NaCl solution. The electrochemical behavior of the alloy was evaluated using cyclic polarization, electrochemical impedance spectroscopy (EIS), Mott Schottky, X-ray photoelectron spectroscopy, and chronoamperometry testing. The passive current density decreased after HPT processing, indicating a more protective oxide layer was formed on the surface of the HPT-processed alloy. Mott Schottky analysis confirmed the higher protection efficiency of the passive layer on the HPT-processed alloy. The film formed in the solution-treated alloy was a p-type and an n-type semiconductor while the alloy processed by HPT exhibited only an n-type semiconductor behavior. EIS showed that corrosion resistance in a saline medium increased with HPT processing.

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Lage-MR-2019 - Accepted Manuscript
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More information

Accepted/In Press date: 18 September 2019
e-pub ahead of print date: 4 November 2019
Published date: 2019
Keywords: aluminum alloy, corrosion, high-pressure torsion, ultrafine microstructure

Identifiers

Local EPrints ID: 436281
URI: http://eprints.soton.ac.uk/id/eprint/436281
ISSN: 1516-1439
PURE UUID: 925b24b7-6c7f-4a48-81a3-5e5647985d4d
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 05 Dec 2019 17:30
Last modified: 22 Nov 2021 02:48

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Contributors

Author: Michelle Dias Alves Lage
Author: Renata Braga Soares
Author: Pedro Henrique R. Pereira
Author: Roberto B. Figueiredo
Author: Vanessa Freitas C. Lins

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