Contribution of the oxygen reduction reaction to the electrochemical cathodic partial reaction for Mg-Al-Ca solid solutions
The electrochemical corrosion rate of magnesium depends on the stability of the surface layer formed. Based on the Mg substrate, the oxide structure comprises a dense MgO/Mg(OH)2 mixture underneath a porous plate-like Mg(OH)2 layer. While the kinetics of the anodic partial reaction have been mainly...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-08-01
|
| Series: | Electrochemistry Communications |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1388248123001030 |
| _version_ | 1827876797295886336 |
|---|---|
| author | Markus Felten Siyuan Zhang Rasa Changizi Christina Scheu Mark Bruns Michael Strebl Sannakaisa Virtanen Daniela Zander |
| author_facet | Markus Felten Siyuan Zhang Rasa Changizi Christina Scheu Mark Bruns Michael Strebl Sannakaisa Virtanen Daniela Zander |
| author_sort | Markus Felten |
| collection | DOAJ |
| description | The electrochemical corrosion rate of magnesium depends on the stability of the surface layer formed. Based on the Mg substrate, the oxide structure comprises a dense MgO/Mg(OH)2 mixture underneath a porous plate-like Mg(OH)2 layer. While the kinetics of the anodic partial reaction have been mainly attributed to MgO, recent studies have showed an effect of the Mg(OH)2 layer thickness on the cathodic partial reaction. A thinner Mg(OH)2 layer has been associated with higher kinetics of the oxygen reduction reaction. In the present study, the mechanism has been further investigated via in situ respirometric measurements using Mg-Al-Ca solid solution in electrolytes with different pH values (pH = 8.0–13.0). The results indicate an additional effect based on the structure of the surface layer for Mg-Al-Ca alloys in the passive state. Furthermore, two different Al-enriched interfaces were observed and discussed in terms of their thermodynamic stability under alkaline immersion conditions. |
| first_indexed | 2024-03-12T17:26:33Z |
| format | Article |
| id | doaj.art-70d85b8f906e4caba30140b7f7431f52 |
| institution | Directory Open Access Journal |
| issn | 1388-2481 |
| language | English |
| last_indexed | 2024-03-12T17:26:33Z |
| publishDate | 2023-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Electrochemistry Communications |
| spelling | doaj.art-70d85b8f906e4caba30140b7f7431f522023-08-05T05:15:37ZengElsevierElectrochemistry Communications1388-24812023-08-01153107529Contribution of the oxygen reduction reaction to the electrochemical cathodic partial reaction for Mg-Al-Ca solid solutionsMarkus Felten0Siyuan Zhang1Rasa Changizi2Christina Scheu3Mark Bruns4Michael Strebl5Sannakaisa Virtanen6Daniela Zander7Chair of Corrosion and Corrosion Protection, Division of Materials Science and Engineering, Foundry Institute Aachen, RWTH Aachen University, Aachen GermanyMax-Planck-Institut für Eisenforschung, Düsseldorf GermanyMax-Planck-Institut für Eisenforschung, Düsseldorf GermanyMax-Planck-Institut für Eisenforschung, Düsseldorf GermanyDepartment of Materials Science, Institute for Surface Science and Corrosion, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen GermanyDepartment of Materials Science, Institute for Surface Science and Corrosion, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen GermanyDepartment of Materials Science, Institute for Surface Science and Corrosion, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen GermanyChair of Corrosion and Corrosion Protection, Division of Materials Science and Engineering, Foundry Institute Aachen, RWTH Aachen University, Aachen Germany; Corresponding author.The electrochemical corrosion rate of magnesium depends on the stability of the surface layer formed. Based on the Mg substrate, the oxide structure comprises a dense MgO/Mg(OH)2 mixture underneath a porous plate-like Mg(OH)2 layer. While the kinetics of the anodic partial reaction have been mainly attributed to MgO, recent studies have showed an effect of the Mg(OH)2 layer thickness on the cathodic partial reaction. A thinner Mg(OH)2 layer has been associated with higher kinetics of the oxygen reduction reaction. In the present study, the mechanism has been further investigated via in situ respirometric measurements using Mg-Al-Ca solid solution in electrolytes with different pH values (pH = 8.0–13.0). The results indicate an additional effect based on the structure of the surface layer for Mg-Al-Ca alloys in the passive state. Furthermore, two different Al-enriched interfaces were observed and discussed in terms of their thermodynamic stability under alkaline immersion conditions.http://www.sciencedirect.com/science/article/pii/S1388248123001030MagnesiumCorrosionInterfacesTEMORR |
| spellingShingle | Markus Felten Siyuan Zhang Rasa Changizi Christina Scheu Mark Bruns Michael Strebl Sannakaisa Virtanen Daniela Zander Contribution of the oxygen reduction reaction to the electrochemical cathodic partial reaction for Mg-Al-Ca solid solutions Electrochemistry Communications Magnesium Corrosion Interfaces TEM ORR |
| title | Contribution of the oxygen reduction reaction to the electrochemical cathodic partial reaction for Mg-Al-Ca solid solutions |
| title_full | Contribution of the oxygen reduction reaction to the electrochemical cathodic partial reaction for Mg-Al-Ca solid solutions |
| title_fullStr | Contribution of the oxygen reduction reaction to the electrochemical cathodic partial reaction for Mg-Al-Ca solid solutions |
| title_full_unstemmed | Contribution of the oxygen reduction reaction to the electrochemical cathodic partial reaction for Mg-Al-Ca solid solutions |
| title_short | Contribution of the oxygen reduction reaction to the electrochemical cathodic partial reaction for Mg-Al-Ca solid solutions |
| title_sort | contribution of the oxygen reduction reaction to the electrochemical cathodic partial reaction for mg al ca solid solutions |
| topic | Magnesium Corrosion Interfaces TEM ORR |
| url | http://www.sciencedirect.com/science/article/pii/S1388248123001030 |
| work_keys_str_mv | AT markusfelten contributionoftheoxygenreductionreactiontotheelectrochemicalcathodicpartialreactionformgalcasolidsolutions AT siyuanzhang contributionoftheoxygenreductionreactiontotheelectrochemicalcathodicpartialreactionformgalcasolidsolutions AT rasachangizi contributionoftheoxygenreductionreactiontotheelectrochemicalcathodicpartialreactionformgalcasolidsolutions AT christinascheu contributionoftheoxygenreductionreactiontotheelectrochemicalcathodicpartialreactionformgalcasolidsolutions AT markbruns contributionoftheoxygenreductionreactiontotheelectrochemicalcathodicpartialreactionformgalcasolidsolutions AT michaelstrebl contributionoftheoxygenreductionreactiontotheelectrochemicalcathodicpartialreactionformgalcasolidsolutions AT sannakaisavirtanen contributionoftheoxygenreductionreactiontotheelectrochemicalcathodicpartialreactionformgalcasolidsolutions AT danielazander contributionoftheoxygenreductionreactiontotheelectrochemicalcathodicpartialreactionformgalcasolidsolutions |