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Corrosion Inhibition of Aluminum Alloy AA6063-T5 by Vanadates: Microstructure Characterization and Corrosion Analysis
KTH Royal Institute of Technology, Sweden ; Belarusian State Technological University, Belarus.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB. KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation. KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.ORCID iD: 0000-0002-4697-9192
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2018 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 5, no 3, p. C116-C126Article in journal (Refereed) Published
Abstract [en]

Corrosion inhibition of aluminum alloy AA6063-T5 by vanadates (NaVO3) in 0.05 M NaCl solution has been investigated by electrochemical and weight loss measurements, and associated with microstructure and Volta potential data. X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy analyses confirmed the presence of micrometer-sized Fe-rich Al4.01MnSi0.74, Al1.69Mg4Zn2.31, and FeAl3intermetallic phases (IMPs) and nanometer-sized CuAl2, ZnAl2, and Mg2Si precipitates in the microstructure. Scanning Kelvin probe force microscopy measurements showed Volta potential differences of up to 600 mV between the microstructure constituents indicating a high susceptibility to micro-galvanic corrosion, with interphase boundary regions exhibiting the highest propensity to corrosion. Most IMPs had cathodic character whereas some nanometer-sized Mg-rich particles exhibited anodic nature, with large Volta potential gradients within interphase regions of large cathodic particles. Electrochemical potentiodynamic polarization measurements indicated that the vanadates provided mixed corrosion inhibition effects, mitigating both oxygen reduction, occurring on cathodic IMPs, and anodic metal dissolution reaction, occurring on anodic sites, such as Mg2Si and interphase boundary regions. Electrochemical measurements indicated that the sodium metavanadate inhibitor blocks active metal dissolution, giving high inhibition efficiency (>95%) during the initial exposure, whereas long-term weight loss measurements showed that the efficacy decreases after prolonged exposure.

Place, publisher, year, edition, pages
2018. Vol. 5, no 3, p. C116-C126
Keywords [en]
Aluminum Alloy AA6063-T5 Sodium Metavanadate (NaVO3) Corrosion Inhibition Microstructure Characterization Scanning Kelvin Probe Force Microscopy (SKPFM) Electrochemical Impedance Spectroscopy (EIS)
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34071DOI: 10.1149/2.0341803jesOAI: oai:DiVA.org:ri-34071DiVA, id: diva2:1231284
Available from: 2018-07-06 Created: 2018-07-06 Last updated: 2018-07-06Bibliographically approved

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