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Typically, the data are obtained ex situ, as post factum analysis of occurred degradation processes or in bulk electrolyte that does not fully reflect concentration gradients at the interface and in the diffusion layer. Meanwhile, these local conditions are essential for tissue\u2010implant compatibility. Only a limited number of studies employ the techniques that visualize ongoing degradation and are localized enough to observe the changes in the electrolyte layer directly adjacent to corroding magnesium. Here, local pH in Hank's solution is studied in operando, with potentiometric micro\u2010probes (d = 2 \u00b5m) located 10\u201350 \u00b5m above the surface of four Mg alloys potentially relevant for implant applications. A significant difference in local pH is observed for Mg in simple Hank's solution (near surface pH 9.9\u201310.5) or Hank's solution modified with 2.5 \u00d7 10<jats:sup>\u22123<\/jats:sup>\n<jats:sc>m<\/jats:sc> Ca<jats:sup>2+<\/jats:sup> (pH 7.8\u20138.5). The corresponding pH values are established during the first seconds of immersion. These findings indicate different degradation kinetics in electrolytes with or without Ca<jats:sup>2+<\/jats:sup>. The degradation rate of Mg alloys decreases by almost two times in Ca<jats:sup>2+<\/jats:sup> containing Hank's solution. Calcium\u2010phosphate\/carbonate protective layer stabilizes the surface pH below 8.5 controlling Mg degradation.<\/jats:p>","DOI":"10.1002\/admi.201800169","type":"journal-article","created":{"date-parts":[[2018,6,19]],"date-time":"2018-06-19T14:32:37Z","timestamp":1529418757000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":83,"title":["Local pH and Its Evolution Near Mg Alloy Surfaces Exposed to Simulated Body Fluids"],"prefix":"10.1002","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0349-0899","authenticated-orcid":false,"given":"Sviatlana V.","family":"Lamaka","sequence":"first","affiliation":[{"name":"Magnesium Innovation Centre \u2013 MagIC Institute of Materials Research Helmholtz\u2010Zentrum Geesthacht  21502 Geesthacht Germany"}]},{"given":"Jorge","family":"Gonzalez","sequence":"additional","affiliation":[{"name":"Division Metallic Biomaterials Institute of Materials Research Helmholtz\u2010Zentrum Geesthacht  21502 Geesthacht Germany"}]},{"given":"Di","family":"Mei","sequence":"additional","affiliation":[{"name":"Magnesium Innovation Centre \u2013 MagIC Institute of Materials Research Helmholtz\u2010Zentrum Geesthacht  21502 Geesthacht Germany"}]},{"given":"Frank","family":"Feyerabend","sequence":"additional","affiliation":[{"name":"Division Metallic Biomaterials Institute of Materials Research Helmholtz\u2010Zentrum Geesthacht  21502 Geesthacht Germany"}]},{"given":"Regine","family":"Willumeit\u2010R\u00f6mer","sequence":"additional","affiliation":[{"name":"Division Metallic Biomaterials Institute of Materials Research Helmholtz\u2010Zentrum Geesthacht  21502 Geesthacht Germany"},{"name":"Institute for Materials Science Faculty of Engineering Kiel University  24103 Kiel Germany"}]},{"given":"Mikhail L.","family":"Zheludkevich","sequence":"additional","affiliation":[{"name":"Magnesium Innovation Centre \u2013 MagIC Institute of Materials Research Helmholtz\u2010Zentrum Geesthacht  21502 Geesthacht Germany"},{"name":"Institute for Materials Science Faculty of Engineering Kiel University  24103 Kiel Germany"}]}],"member":"311","published-online":{"date-parts":[[2018,6,19]]},"reference":[{"key":"e_1_2_5_1_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pmatsci.2017.04.011"},{"key":"e_1_2_5_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/nm.4162"},{"key":"e_1_2_5_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.actbio.2014.11.048"},{"key":"e_1_2_5_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/adem.200310405"},{"key":"e_1_2_5_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.electacta.2009.08.018"},{"key":"e_1_2_5_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.electacta.2012.09.029"},{"key":"e_1_2_5_5_3","doi-asserted-by":"publisher","DOI":"10.1016\/j.corsci.2014.04.035"},{"key":"e_1_2_5_5_4","doi-asserted-by":"publisher","DOI":"10.1149\/2.0601510jes"},{"key":"e_1_2_5_5_5","doi-asserted-by":"publisher","DOI":"10.1002\/elan.201600265"},{"key":"e_1_2_5_5_6","doi-asserted-by":"publisher","DOI":"10.1016\/j.msec.2015.11.069"},{"key":"e_1_2_5_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.msec.2015.09.067"},{"key":"e_1_2_5_6_2","doi-asserted-by":"publisher","DOI":"10.1007\/s10856-011-4517-y"},{"key":"e_1_2_5_6_3","doi-asserted-by":"publisher","DOI":"10.1149\/1.3421651"},{"key":"e_1_2_5_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.actbio.2013.11.021"},{"key":"e_1_2_5_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.msec.2008.08.026"},{"key":"e_1_2_5_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.electacta.2016.01.188"},{"key":"e_1_2_5_9_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsbiomaterials.5b00044"},{"key":"e_1_2_5_10_1","doi-asserted-by":"publisher","DOI":"10.2320\/matertrans.42.1317"},{"key":"e_1_2_5_10_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.corsci.2015.08.001"},{"key":"e_1_2_5_10_3","doi-asserted-by":"publisher","DOI":"10.1016\/j.actbio.2009.06.028"},{"key":"e_1_2_5_10_4","doi-asserted-by":"publisher","DOI":"10.1038\/srep13026"},{"key":"e_1_2_5_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pnsc.2014.08.009"},{"key":"e_1_2_5_11_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.matchemphys.2017.05.024"},{"key":"e_1_2_5_11_3","doi-asserted-by":"publisher","DOI":"10.1002\/jbm.b.33685"},{"key":"e_1_2_5_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.corsci.2017.07.011"},{"key":"e_1_2_5_13_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10856-011-4490-5"},{"key":"e_1_2_5_14_1","first-page":"2162","volume-title":"Microscopy: Science, Technology, Applications and Education","author":"Lamaka S. 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