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Typically, hydrogen evolution reaction is considered as the only cathodic reaction during Mg corrosion. However, recent works demonstrate importance of considering oxygen reduction reaction (ORR) as a second cathodic process at specific conditions. With oxygen micro-optode, we show that ORR rate was higher on slower corroding ultra-high-purity Mg (UHP-Mg), while lower on faster corroding commercially pure Mg (CP-Mg), where massive hydroxide layer impeded oxygen permeation. These findings shed light on yet another facet of complex mechanism of Mg corrosion.<\/jats:p>","DOI":"10.1038\/s41529-020-00146-1","type":"journal-article","created":{"date-parts":[[2020,12,23]],"date-time":"2020-12-23T11:03:02Z","timestamp":1608721382000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":52,"title":["High rate oxygen reduction reaction during corrosion of ultra-high-purity magnesium"],"prefix":"10.1038","volume":"4","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0350-9406","authenticated-orcid":false,"given":"Cheng","family":"Wang","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1327-4217","authenticated-orcid":false,"given":"Di","family":"Mei","sequence":"additional","affiliation":[]},{"given":"Gert","family":"Wiese","sequence":"additional","affiliation":[]},{"given":"Linqian","family":"Wang","sequence":"additional","affiliation":[]},{"given":"Min","family":"Deng","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0349-0899","authenticated-orcid":false,"given":"Sviatlana V.","family":"Lamaka","sequence":"additional","affiliation":[]},{"given":"Mikhail L.","family":"Zheludkevich","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2020,12,23]]},"reference":[{"key":"146_CR1","doi-asserted-by":"publisher","first-page":"92","DOI":"10.1016\/j.pmatsci.2017.04.011","volume":"89","author":"M Esmaily","year":"2017","unstructured":"Esmaily, M. et al. 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