Electrochemical behaviour of nickel–aluminium bronze in chloride media: influence of pH and benzotriazole
Electrochemical behaviour of nickel–aluminium bronze in chloride media: influence of pH and benzotriazole
The corrosion properties of the nickel–aluminium bronze (NAB) in aqueous chloride media were investigated at different pHs by using linear potential sweep voltammetry and scanning electron microscopy. The NAB electrochemical behaviour was dependent on the solution pH, due to the different stabilities of the phases present within its microstructure. In particular, at solution pHs higher than 4.0 the NAB oxidation was driven by the dissolution of the copper-rich ?-phase, whereas at pH values lower than 4.0 its anodic behaviour was controlled by the oxidation of the iron-, nickel- and aluminium-rich ?I-, ?II- and ?IV-phases. Furthermore, a kinetic model for the NAB oxidation, in neutral chloride solutions, was developed on the basis of the observed behaviour, i.e., order of reactions of NAB with respect to protons and chloride. Finally, considering the high affinity of benzotriazole for copper, the corrosion performance of NAB was studied in the presence of the inhibitor in neutral (pH of 6.2) and acidic (pH of 3.5) chloride solutions, where NAB exhibited different anodic behaviours.
nickel–aluminium bronze, copper, order of reaction, corrosion, microstructure, inhibition
38-46
Neodo, Stefano
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Carugo, Dario
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Wharton, Julian A.
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Stokes, Keith R.
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22 February 2013
Neodo, Stefano
5d5dabb5-be7e-4ba6-b05c-6b192f4639a0
Carugo, Dario
0a4be6cd-e309-4ed8-a620-20256ce01179
Wharton, Julian A.
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Stokes, Keith R.
5fb4e7f7-2f7e-4e6e-a045-6d7690626695
Neodo, Stefano, Carugo, Dario, Wharton, Julian A. and Stokes, Keith R.
(2013)
Electrochemical behaviour of nickel–aluminium bronze in chloride media: influence of pH and benzotriazole.
Journal of Electroanalytical Chemistry, 695, .
(doi:10.1016/j.jelechem.2013.02.007).
Abstract
The corrosion properties of the nickel–aluminium bronze (NAB) in aqueous chloride media were investigated at different pHs by using linear potential sweep voltammetry and scanning electron microscopy. The NAB electrochemical behaviour was dependent on the solution pH, due to the different stabilities of the phases present within its microstructure. In particular, at solution pHs higher than 4.0 the NAB oxidation was driven by the dissolution of the copper-rich ?-phase, whereas at pH values lower than 4.0 its anodic behaviour was controlled by the oxidation of the iron-, nickel- and aluminium-rich ?I-, ?II- and ?IV-phases. Furthermore, a kinetic model for the NAB oxidation, in neutral chloride solutions, was developed on the basis of the observed behaviour, i.e., order of reactions of NAB with respect to protons and chloride. Finally, considering the high affinity of benzotriazole for copper, the corrosion performance of NAB was studied in the presence of the inhibitor in neutral (pH of 6.2) and acidic (pH of 3.5) chloride solutions, where NAB exhibited different anodic behaviours.
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Published date: 22 February 2013
Additional Information:
Corresponding author: Stefano Neodo;
Contact email: sn1d09@soton.ac.uk, s.neodo@libero.it
Keywords:
nickel–aluminium bronze, copper, order of reaction, corrosion, microstructure, inhibition
Organisations:
Bioengineering Group, nCATS Group
Identifiers
Local EPrints ID: 350842
URI: http://eprints.soton.ac.uk/id/eprint/350842
ISSN: 1572-6657
PURE UUID: d3606a90-cf34-4467-8b38-d80806b76f9c
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Date deposited: 09 Apr 2013 13:34
Last modified: 15 Mar 2024 02:58
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Stefano Neodo
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