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Keywords = Mg-Al galvanic pair

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15 pages, 2058 KiB  
Article
Use of Amperometric and Potentiometric Probes in Scanning Electrochemical Microscopy for the Spatially-Resolved Monitoring of Severe Localized Corrosion Sites on Aluminum Alloy 2098-T351
by Rejane M. P. da Silva, Javier Izquierdo, Mariana X. Milagre, Abenchara M. Betancor-Abreu, Isolda Costa and Ricardo M. Souto
Sensors 2021, 21(4), 1132; https://doi.org/10.3390/s21041132 - 6 Feb 2021
Cited by 11 | Viewed by 2974
Abstract
Amperometric and potentiometric probes were employed for the detection and characterization of reactive sites on the 2098-T351 Al-alloy (AA2098-T351) using scanning electrochemical microscopy (SECM). Firstly, the probe of concept was performed on a model Mg-Al galvanic pair system using SECM in the amperometric [...] Read more.
Amperometric and potentiometric probes were employed for the detection and characterization of reactive sites on the 2098-T351 Al-alloy (AA2098-T351) using scanning electrochemical microscopy (SECM). Firstly, the probe of concept was performed on a model Mg-Al galvanic pair system using SECM in the amperometric and potentiometric operation modes, in order to address the responsiveness of the probes for the characterization of this galvanic pair system. Next, these sensing probes were employed to characterize the 2098-T351 alloy surface immersed in a saline aqueous solution at ambient temperature. The distribution of reactive sites and the local pH changes associated with severe localized corrosion (SLC) on the alloy surface were imaged and subsequently studied. Higher hydrogen evolution, lower oxygen depletion and acidification occurred at the SLC sites developed on the 2098-T351 Al-alloy. Full article
(This article belongs to the Collection Electrochemical Sensors and Platforms: Design and Application)
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