Surface and corrosion properties of AA6063-T5 aluminum alloy in molybdate-containing sodium chloride solutionsShow others and affiliations
2020 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 171, article id 108658Article in journal (Refereed) Published
Abstract [en]
Corrosion properties of aluminum alloy AA6063-T5 were investigated in molybdate-containing NaCl solutions. Electrochemical, microscopic, and spectroscopic experiments were utilized to examine the mechanism of corrosion inhibition by molybdates. SEM-EDX, magnetic force, and intermodulation electrostatic force microscopy data suggested that the inhibition initiation preferentially occurred over Fe-rich cathodic IMPs. Spectroscopic measurements demonstrated that the formed surface layer consists of mixed Mo(VI, V, IV) species. This layer provided inhibition with an efficiency of ∼90% after 4 h of exposure. High efficacy of ∼70% was achieved even after one week of exposure. A two-step oxidation-reduction mechanism of corrosion inhibition by aqueous molybdates was proposed. © 2020 The Authors
Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 171, article id 108658
Keywords [en]
Aluminum, Molybdate inhibitor, Raman spectroscopy, Scanning probe microscopy, SEM, XPS, Aluminum chloride, Aluminum corrosion, Corrosion inhibitors, Corrosive effects, Electric force microscopy, Electrostatic force, Molybdenum compounds, Sodium alloys, Sodium chloride, Corrosion property, Electrostatic force microscopy, Magnetic force, Mechanism of corrosion, Oxidation-reduction mechanism, Sodium chloride solution, Spectroscopic measurements, Surface layers, Aluminum alloys
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-45074DOI: 10.1016/j.corsci.2020.108658Scopus ID: 2-s2.0-85085517230OAI: oai:DiVA.org:ri-45074DiVA, id: diva2:1449761
Note
Funding details: Ministry of Education of the Republic of Belarus, 20192322; Funding text 1: Dmitry Kharitonov gratefully acknowledges financial support from the Si Swedish Institute (Visby programme scholarship) and Erasmus + mobility program. Irina Kurilo gratefully acknowledges The Ministry of Education of the Republic of Belarus for financial support under grant no. 20192322 “Composite oxide coatings on aluminum matrix with enhanced physic-chemical and anticorrosion properties”. Jacek Ryl gratefully acknowledges the financial support of the Polish Ministry of Science and Higher Education from the budget funds in the period 2016–2019 under Iuventus Plus project no. IP2015067574.
2020-06-302020-06-302023-03-30Bibliographically approved