Electrochemical Behavior of Al–Al9Co2 Alloys in Sulfuric Acid

Sfikas, Athanasios and Lekatou, Angeliki G. (2020) Electrochemical Behavior of Al–Al9Co2 Alloys in Sulfuric Acid. Corrosion and Materials Degradation, 1 (2). pp. 249-272. ISSN 2624-5558

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Official URL: https://doi.org/10.3390/cmd1020012

Abstract

Al–Co alloys of various Co contents (2–20 wt.% Co) were fabricated by vacuum arc melting (VAM) with the scope to investigate the influence of cobalt on the microstructure and corrosion resistance of Al in 1 M H2SO4. The obtained microstructures were directional, consisting of Al9Co2 platelets (grown to coarse acicular plates as the Co content increased) uniformly dispersed in an Al-matrix. Alloying Al with Co did not decrease the rate of uniform corrosion of Al but it considerably increased its passivation ability. Moreover, all Al–Co alloys displayed lower uniform corrosion rate and notably higher passivation ability than market leading Al-alloys. The underlying mechanisms during anodic polarization in 1 M H2SO4 were identified and correlated with the microstructure. High Co content alloys (7–20 wt.% Co) presented superior passivation ability in 1 M H2SO4 as compared to the low Co content alloys.

Item Type: Article
Uncontrolled Keywords: Al–Al9Co2; off-equilibrium; cyclic polarization; chronoamperometry; passivity; H2SO4; Raman spectroscopy
Subjects: H800 Chemical, Process and Energy Engineering
H900 Others in Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Rachel Branson
Date Deposited: 02 Mar 2021 15:23
Last Modified: 31 May 2021 14:42
URI: http://nrl.northumbria.ac.uk/id/eprint/45589

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