期刊
CORROSION SCIENCE
卷 171, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.108658
关键词
Aluminum; Raman spectroscopy; SEM; XPS; Scanning probe microscopy; Molybdate inhibitor
资金
- Si Swedish Institute
- Erasmus+ mobility program
- Ministry of Education of the Republic of Belarus [20192322]
- Polish Ministry of Science and Higher Education [IP2015067574]
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 similar to 90% after 4 h of exposure. High efficacy of similar to 70% was achieved even after one week of exposure. A two-step oxidation-reduction mechanism of corrosion inhibition by aqueous molybdates was proposed.
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