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Corrosion inhibition of AA6063 alloy by vanadates in alkaline media |
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| Authors: | DS Kharitonov II Kurilo A Wrzesińska IM Zharskii |
| Affiliation: | 1. Belarusian State Technological University, Department of Chemistry, Technology of Electrochemical Production and Electronic Engineering Materials, MINSK, BELARUS;2. KTH Royal Institute of Technology, Surface and Corrosion Science Division, STOCKHOLM, SWEDEN;3. Belarusian State Technological University, General and Inorganic Chemistry Department, MINSK, BELARUS;4. Lodz University of Technology, Department of Molecular Physics, LODZ, POLAND |
| Abstract: | Vanadium aqueous compounds are considered as promising environmentally friendly inhibitors for heterogeneous aluminium alloys. In this study, mechanism of corrosion inhibition of AA6063 in alkaline media by vanadate inhibitors is presented. A combination of weight loss and open circuit potential measurements, potentiodynamic polarization and electrochemical impedance spectroscopy was used to compare corrosion behavior of AA6063 alloy in aerated pH 10 0.05 M sodium chloride solutions in the absence and presence of 0.003 mol/l sodium orthovanadate. Tetrahedrally coordinated mono‐ and polyvanadates, that are main forms in such solutions, cause a decrease in corrosion current density and significantly increase amplitude of impedance spectra and impedance modulus |Z| values due to mixed cathodic‐anodic inhibition effect mainly associated with the formation of adherent surface film on cathodic and anodic intermetallic particles of alloy. |
| Keywords: | Corrosion AA6063 sodium orthovanadate inhibitor corrosion mechanism electrochemical impedance spectroscopy inhibition efficiency potentiodynamic polarization Korrosion AA6063 Natrium Orthovanadat Inhibitor Korrosionsmechanismus elektrochemische Impedanzspektroskopie Inhibitionseffizienz potenziodynamische Polarisation |