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Aqueous molybdate provides effective corrosion inhibition of WE43 magnesium alloy in sodium chloride solutions
Polish Academy of Sciences, Poland.
Polish Academy of Sciences, Poland.
Gdansk University of Technology, Poland.
Gdansk University of Technology, Poland.
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2021 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 190, article id 109664Article in journal (Refereed) Published
Abstract [en]

Corrosion and corrosion inhibition of WE43 magnesium alloy were investigated in NaCl solutions containing different amounts of sodium molybdate. Electrochemical, microscopic, and spectroscopic experiments were utilized to examine the mechanism of corrosion inhibition by molybdates. Electrochemical data showed that Na2MoO4 inhibitor provides reliable inhibition at concentrations at and above 100 mM. Raman and XPS spectroscopy demonstrated that the formed surface layer consists of mixed Mo(V, IV) species. This layer provided inhibition with an efficiency of 91–99 % after 24 h of exposure. A two-step oxidation-reduction mechanism of corrosion inhibition of the WE43 alloy by aqueous molybdates was proposed. © 2021 The Author(s)

Place, publisher, year, edition, pages
Elsevier Ltd , 2021. Vol. 190, article id 109664
Keywords [en]
Magnesium, EIS, Raman spectroscopy, Scanning probe microscopy, XPS, Molybdate inhibitor
National Category
Corrosion Engineering
Identifiers
URN: urn:nbn:se:ri:diva-55472DOI: 10.1016/j.corsci.2021.109664Scopus ID: 2-s2.0-85110075977OAI: oai:DiVA.org:ri-55472DiVA, id: diva2:1583320
Note

Funding details: Narodowe Centrum Nauki, NCN, 2019/03/X/ST4/00749; Funding text 1: Dmitry Kharitonov gratefully acknowledges financial support from the National Science Centre (Poland) under research Grant Miniatura no. 2019/03/X/ST4/00749 .

Available from: 2021-08-05 Created: 2021-08-05 Last updated: 2021-08-05Bibliographically approved

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