Pigment-Derived Inhibitors for Aluminum Alloy 2024-T3

Cook, Robert P.; Taylor, S. R.

doi:10.5006/1.3287661

Cited by 69 publications

(30 citation statements)

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“…In addition to the physical barrier, the corrosion resistance is possibly due to the low level of cathodic activity suppressed by 10 vanadate released from LDHs. Vanadates are known as effective inhibitors for protection of aluminium alloys against corrosion [13,17,18]. The inhibition is not attributed to their oxidative power, as much as to their ability to adsorb on the surface in unaltered oxidation state.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Corrosion protection of AA2024-T3 by LDH conversion films. Analysis of SVET results

Tedim

Bastos

Kallip

et al. 2016

Electrochimica Acta

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In this work the protective effect of layered double hydroxide (LDH) films directly grown on the surface of 2024-T3 aluminium alloy is investigated using electrochemical impedance spectroscopy (EIS) and the scanning vibrating electrode technique (SVET).The SVET results focused on the localised nature of the corrosion process and are in agreement with the global response measured by EIS. Furthermore, the evolution of active corrosion protection rendered by LDH films is surveyed at microscale for the first time for long immersion periods in NaCl solution and in the presence of induced defects. The quantitative information provided by SVET is discussed and a parameter to describe the degree of corrosion localisation is introduced based on LDH systems.

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Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Corrosion protection of AA2024-T3 by LDH conversion films. Analysis of SVET results

Tedim

Bastos

Kallip

et al. 2016

Electrochimica Acta

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“…7,8 Cook observed a 2 order of magnitude decrease in corrosion current from polarization measurements in 0.6 M NaCl solution at pH 7 with 3.4 mM NaVO 3 on Al 2024-T3, similar to the decrease observed for sodium chromate additions. 6 Furthermore, electrochemical impedance spectroscopy measurements on Al 2024-T3 samples exposed to 0.6 M NaCl solutions with 3.4 mM NaVO 3 carried out over 10 days showed aqueous NaVO 3 was poorly protective at pH 3 but was inhibiting at pH 7 and 10. 6 Iannuzzi et al observed significant decreases in cathodic kinetics in 0.5 M NaCl solutions containing 10 mM NaVO 3 at pH values ranging from 7.8 to 9.3.…”

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confidence: 99%

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confidence: 99%

“…[1][2][3][4][5][6][7] In particular, vanadates in NaCl solutions have been shown, under specific conditions, to be modest anodic inhibitors and potent cathodic inhibitors for 2024. [3][4][5][6][7][8] Furthermore, there are ways to functionalize soluble vanadates through the formation of films and conversion coatings, and by incorporation into organic coatings. [7][8][9][10][11][12] Additionally, a number of vanadate surface treatments and pigmented organic coatings applied to zinc and aluminum substrates have been observed to "self-heal" in a fashion resembling that shown by chromate-based coatings.…”

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confidence: 99%

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Corrosion Inhibition of Aluminum Alloy 2024-T3 by Aqueous Vanadium Species

Ralston

Chrisanti

Young

et al. 2008

J. Electrochem. Soc.

111

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Nuclear magnetic resonance ͑NMR͒ measurements were made on aqueous vanadate solutions to characterize speciation as a function of pH and vanadate concentration. Additionally, potentiodynamic polarization measurements were carried out on Al alloy 2024-T3 in 50 mM NaCl solutions in which pH and vanadate concentration were systematically varied. Results showed that inhibition by vanadates occurred mainly in alkaline solutions where tetrahedrally coordinated vanadates, metavanadate and pyrovanadate, were abundant. Inhibition was not observed in solutions where octahedrally coordinated decavanadates predominated. Anodic inhibition, in the form of increased pitting potential, was observed in both aerated and deaerated solutions. In contrast, cathodic inhibition was observed only in aerated solutions acting primarily through the suppression of oxygen reduction. Energydispersive spectroscopy, used to collect chemical maps from aluminum coupons exposed to vanadate solutions, showed the suppression of Al 2 CuMg particle dissolution compared to vanadate-free solutions. NMR measurements were also used to track changes in vanadate speciation with time, pH adjustment, and with exposure to metallic aluminum surfaces. NMR showed noninhibiting octahedrally coordinated decavanadates rapidly decompose into inhibiting tetrahedrally coordinated metavanadates and pyrovanadates after alkaline pH adjustment. While decomposition begins immediately upon pH adjustment, equilibrium may not be reached even after significant time periods.

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“…Smith et al explored the release kinetics and protection performance of vanadate based pigments in epoxy-coated AA 2014-T6 panels [5]. Cook et al investigated several corrosion inhibitors including vanadates, molybdates and ions of rare earth elements like Ce, Y and La [6]. Blanc et al developed a surface conversion process for aluminium alloy based on acidic vanadium formulations which imparted protection to AA 2024-T3 coated panel [7].…”

Section: Introductionmentioning

confidence: 99%