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Mapping the Galvanic Corrosion of Three Metals Coupled with a Wire Beam Electrode: The Influence of Temperature and Relative Geometrical Position

1
College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, China
2
Corrosion and Protection Centre, The University of Manchester, Manchester M13 9PL, UK
*
Author to whom correspondence should be addressed.
Materials 2018, 11(3), 357; https://doi.org/10.3390/ma11030357
Received: 19 January 2018 / Revised: 22 February 2018 / Accepted: 26 February 2018 / Published: 28 February 2018
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

The local electrochemical properties of galvanic corrosion for three coupled metals in a desalination plant were investigated with three wire-beam electrodes as wire sensors: aluminum brass (HAl77-2), titanium (TA2), and 316L stainless steel (316L SS). These electrodes were used with artificial seawater at different temperatures. The potential and current–density distributions of the three-metal coupled system are inhomogeneous. The HAl77-2 wire anodes were corroded in the three-metal coupled system. The TA2 wires acted as cathodes and were protected; the 316L SS wires acted as secondary cathodes. The temperature and electrode arrangement have important effects on the galvanic corrosion of the three-metal coupled system. The corrosion current of the HAl77-2 increased with temperature indicating enhanced anode corrosion at higher temperature. In addition, the corrosion of HAl77-2 was more significant when the HAl77-2 wires were located in the middle of the coupled system than with the other two metal arrangement styles. View Full-Text
Keywords: desalination; galvanic corrosion; wire-beam electrode; heterogeneous electrochemistry; temperature; relative geometrical position desalination; galvanic corrosion; wire-beam electrode; heterogeneous electrochemistry; temperature; relative geometrical position
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Ju, H.; Yang, Y.-F.; Liu, Y.-F.; Liu, S.-F.; Duan, J.-Z.; Li, Y. Mapping the Galvanic Corrosion of Three Metals Coupled with a Wire Beam Electrode: The Influence of Temperature and Relative Geometrical Position. Materials 2018, 11, 357.

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