Journal ArticleDOI
Potentiodynamic evaluation of sol–gel coatings with inorganic inhibitors
TLDR
The use of corrosion inhibitors within organically modified sol-gel coatings is discussed in this article, where the improved performance characteristics were derived from the solgel ability to form a uniform, low defect, barrier coating.Abstract:
Sol–gel coatings were investigated as potential replacements for chromate-based surface treatments on aircraft aluminum alloys. Unlike chromate based treatments current sol–gel coatings do not have the ability to leach corrosion inhibitors upon coating damage and minimize corrosion of the unprotected area. As an alternative, environmentally compliant non-chromate inhibitors of Ce(NO3)3, NaVO3 and Na2MoO4 were incorporated into a Zr-epoxy sol–gel. Results are reported on the coatings chemical analysis and their corrosion protection performance based on electrochemical studies. Aluminum alloy 2024-T3 test coupons coated with protective sol–gel films were found to provide considerable corrosion protection. The improved performance characteristics were derived from the sol–gel ability to form a uniform, low defect, barrier coating. Coatings doped with Ce(NO3)3 had barrier properties at least as good as the standard sol–gel coatings. Coatings with Na2MoO4 and NaVO3 did not provide adequate corrosion protection. The use of corrosion inhibitors within organically modified sol–gel coatings is discussed.read more
Citations
More filters
Journal ArticleDOI
Sol–gel coatings on metals for corrosion protection
Duhua Wang,Gordon P. Bierwagen +1 more
TL;DR: In this article, a review of the recent developments and applications of sol-gel corrosion protection coatings on different metal substrates, such as steel, aluminum, copper, magnesium and their alloys, is presented.
Journal ArticleDOI
Layer‐by‐Layer Assembled Nanocontainers for Self‐Healing Corrosion Protection
Dmitry G. Shchukin,Mikhail L. Zheludkevich,Kiryl A. Yasakau,Sviatlana V. Lamaka,Mário G.S. Ferreira,Helmuth Möhwald +5 more
TL;DR: In this article, the authors proposed to use a layer-by-layer (LbL) deposition of oppositely charged species (polyelectrolytes, nanoparticles, enzymes, dendrimers) from their solutions on the substrate surface to prepare reservoirs with regulated storage/release properties assembled with nanometer-thickness precision.
Journal ArticleDOI
Anticorrosion Coatings with Self-Healing Effect Based on Nanocontainers Impregnated with Corrosion Inhibitor
Mikhail L. Zheludkevich,Dmitry G. Shchukin,Kiryl A. Yasakau,Helmut Möhwald,Mário G.S. Ferreira +4 more
TL;DR: In this paper, a silica-zirconia based hybrid film was used as an anticorrosion coating deposited on 2024 aluminum alloy, which showed an effective self-healing ability of the defects.
Journal ArticleDOI
Nanostructured sol-gel coatings doped with cerium nitrate as pre-treatments for AA2024-T3 Corrosion protection performance
Mikhail L. Zheludkevich,R. Serra,Maria de Fátima Montemor,Kiryl A. Yasakau,I.M. Miranda Salvado,Mário G.S. Ferreira,Mário G.S. Ferreira +6 more
TL;DR: In this paper, a nanostructured hybrid sol-gel coatings doped with cerium ions were investigated as pre-treatments for the AA2024-T3 alloy.
Journal ArticleDOI
Sol–gel coatings for corrosion protection of metals
TL;DR: In this article, the incorporation of nanoparticles in the hybrid sol-gel systems increases the corrosion protection properties due to lower porosity and lower cracking potential along with enhancement of the mechanical properties.
References
More filters
Journal ArticleDOI
The mechanism of corrosion inhibition by chromate conversion coatings from x-ray absorption near edge spectroscopy (Xanes)
TL;DR: In this paper, X-ray absorption spectra of chromate conversion coatings on Al 2024-T3 and 3003-H14 have been obtained as a function of processing time and environmental exposure.
Journal ArticleDOI
Review: Replacements for Chromium Pretreatments on Aluminum
TL;DR: The use of chromium (Cr) as an anticorrosion pretreatment ingredient to protect aluminum (Al) alloys is being restricted because of environmental concerns as discussed by the authors, but the use of Cr is not restricted to aluminum alloys.
Journal ArticleDOI
Inhibition of pitting corrosion on aluminum alloy 2024-T3: Effect of soluble chromate additions vs. chromate conversion coating
TL;DR: In this article, the authors improved the Pitting potential of aluminum alloy (AA) 2024-T3 (UNS A92024) with additions of 0.01 M soluble chromate at pH 6 and pH 8.
Journal ArticleDOI
Studies on the Passivation of Aluminium in Chromate and Molybdate Solutions
TL;DR: In this article, the electrochemical behavior of aluminium in aggressive chloride solutions containing molybdate and dichromate anions was investigated and an ennoblement in the pitting potential of aluminium was observed.
Related Papers (5)
Review of alternatives to chromate for corrosion protection of aluminum aerospace alloys
R. L. Twite,Gordon P. Bierwagen +1 more