Aluminum Alloy Corrosion Inhibition by Vanadates
Open Access
- 1 January 2006
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 153 (12), B533-B541
- https://doi.org/10.1149/1.2358843
Abstract
The inhibition of Al alloy corrosion by vanadates was studied in this work. Vanadium speciation is very complicated and vital to the inhibition efficacy. Critical conditions for decavanadate polymerization from clear metavanadate solutions were investigated. Decavanadate only formed when metavanadate was added to solutions of pH 3 or less. It was not possible to change the pH of a metavanadate solution without forming decavanadates, creating an orange-colored solution. According to V51V51 nuclear magnetic resonance, monovanadates were present only in clear metavanadate solutions; orange solutions always contained decavanadates and never contained monovanadates. Orange decavanadate solutions containing 0.5MNaCl0.5MNaCl at pH 8.71 exhibited no significant inhibition of the oxygen reduction reaction and increasing decavanadate concentration was detrimental. In contrast, clear metavanadate solutions containing monovanadate exhibited strong inhibition of the oxygen reduction reaction, to a level similar to chromate. At a fixed pH, increased NaVO3NaVO3 concentration in clear metavanadate solutions increased inhibition efficiency.Keywords
This publication has 48 references indexed in Scilit:
- Rapid Discovery of Corrosion Inhibitors and Synergistic Combinations Using High-Throughput Screening MethodsCorrosion, 2005
- Corrosion Protection of Aluminum Alloy 2024-T3 by Vanadate Conversion CoatingsCorrosion, 2004
- Corrosion Inhibition of Aluminum and Aluminum Alloys by Soluble Chromates, Chromate Coatings, and Chromate-Free CoatingsCorrosion, 2003
- Mass-Transport-Limited Oxygen Reduction Reaction on AA2024-T3 and Selected Intermetallic Compounds in Chromate-Containing SolutionsCorrosion, 2001
- Pigment-Derived Inhibitors for Aluminum Alloy 2024-T3Corrosion, 2000
- Storage and Release of Soluble Hexavalent Chromium from Chromate Conversion Coatings Equilibrium Aspects of Cr[sup VI] ConcentrationJournal of the Electrochemical Society, 2000
- Microconstituent-Induced Pitting Corrosion in Aluminum Alloy 2024-T3Corrosion, 1996
- Thermochemistry of Vanadium(5+) in Aqueous SolutionsJournal of Chemical & Engineering Data, 1995
- Vanadium-51 and oxygen-17 nuclear magnetic resonance study of vanadate(V) equilibria and kineticsJ. Chem. Soc., Dalton Trans., 1981
- Applications of vanadium-51 and phosphorus-31 nuclear magnetic resonance spectroscopy to the study of iso- and hetero-polyvanadatesJ. Chem. Soc., Dalton Trans., 1976