| Alternative title | Ag+ interference from Ag/AgCl wire quasi-reference counter electrode inducing corrosion potential shift in an oil-immersed scanning micropipette contact method measurement |
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| Download | - View supplementary information: Ag⁺ interference from Ag/AgCl wire quasi-reference counter electrode inducing corrosion potential shift in an oil-immersed scanning micropipette contact method measurement (PDF, 1.0 MiB)
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| DOI | Resolve DOI: https://doi.org/10.1021/acs.analchem.1c01045 |
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| Author | Search for: Li, Yuanjiao; Search for: Morel, Alban1; Search for: Gallant, Danick1; Search for: Mauzeroll, JanineORCID identifier: https://orcid.org/0000-0003-4752-7507 |
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| Affiliation | - National Research Council of Canada. Automotive and Surface Transportation
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| Format | Text, Article |
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| Subject | electrochemistry; wires; liquids; electrodes; oxidation |
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| Abstract | Quantitative scanning micropipette contact method measurements are subject to the deleterious effects of reference electrode interference. The commonly used Ag/AgCl wire quasi-reference counter electrode in the miniaturized electrochemical cell of the scanning micropipette contact method was found to leak Ag⁺ into the electrolyte solution. The reduction of these Ag⁺ species at the working electrode surface generates a faradaic current, which significantly affects the low magnitude currents inherently measured in the scanning micropipette contact method. We demonstrate that, during the microscopic corrosion investigation of the AA7075-T73 alloy using the oil-immersed scanning micropipette contact method, the cathodic current was increased by the Ag⁺ reduction, resulting in positive shifts of corrosion potentials. The use of a leak-free Ag/AgCl electrode or an extended distance between the Ag/AgCl wire and micropipette tip droplet eliminated the Ag⁺ contamination, making it possible to measure accurate corrosion potentials during the oil-immersed scanning micropipette contact method measurements. |
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| Publication date | 2021-07-08 |
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| Publisher | American Chemical Society |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 72048e68-a3fd-4ad2-b4a0-d8b5e8908d06 |
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| Record created | 2021-12-07 |
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| Record modified | 2021-12-07 |
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