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Article

Pentavalent Vanadium Species as Potential Corrosion Inhibitors of Al2Cu Intermetallic Phase in the Sulfuric(VI) Acid Solutions

1
Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Żwirki i Wigury 4, 35-036 Rzeszów, Poland
2
Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Kawiory 30, 30-055 Kraków, Poland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(8), 1946; https://doi.org/10.3390/ma13081946
Received: 9 April 2020 / Accepted: 17 April 2020 / Published: 21 April 2020
(This article belongs to the Special Issue Corrosion of Nonferrous Metals and Their Alloys)
The objective of this work was to test vanadium isopolyoxoanions as potential corrosion inhibitors of the intermetallic phase Al2Cu in sulfuric acid solutions at pH = 1.3 and 2.5. The intermetallic was melted in an electric arc furnace. Its phase composition was confirmed using X-ray diffraction, light microscopy, and differential scanning calorimetry. Then Al2Cu corrosion kinetics was studied. Chemical composition of the solution after corrosion was determined using inductively coupled plasma-optical emission spectroscopy. The surface of corroded specimens was analyzed using scanning electron microscopy and X-ray photoelectron spectroscopy. Subsequent electrochemical studies involved determination of open-circuit potential, electrochemical impedance spectra, and polarization curves. It was found that the Al2Cu phase corrodes selectively and vanadium isopolyoxoanions increase this process both at pH = 1.3 and 2.5 with two exceptions. Corrosion inhibition was observed for 100 and 200 mM of Na3VO4 at pH 1.3, with inhibition efficiency 78% and 62% respectively, due to precipitation of V2O5. View Full-Text
Keywords: intermetallics; selective corrosion; sodium orthovanadate; isopolyoxoanions intermetallics; selective corrosion; sodium orthovanadate; isopolyoxoanions
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MDPI and ACS Style

Kwolek, P.; Kościelniak, B.; Wytrwal-Sarna, M. Pentavalent Vanadium Species as Potential Corrosion Inhibitors of Al2Cu Intermetallic Phase in the Sulfuric(VI) Acid Solutions. Materials 2020, 13, 1946. https://doi.org/10.3390/ma13081946

AMA Style

Kwolek P, Kościelniak B, Wytrwal-Sarna M. Pentavalent Vanadium Species as Potential Corrosion Inhibitors of Al2Cu Intermetallic Phase in the Sulfuric(VI) Acid Solutions. Materials. 2020; 13(8):1946. https://doi.org/10.3390/ma13081946

Chicago/Turabian Style

Kwolek, Przemysław, Barbara Kościelniak, and Magdalena Wytrwal-Sarna. 2020. "Pentavalent Vanadium Species as Potential Corrosion Inhibitors of Al2Cu Intermetallic Phase in the Sulfuric(VI) Acid Solutions" Materials 13, no. 8: 1946. https://doi.org/10.3390/ma13081946

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