Development of Permanganate-Based Coatings on Aluminum Alloy 2024-T3

Hughés, A.E.; Gorman, J.D.; Harvey, T. G.; Galassi, Andrea; McAdam, G.

doi:10.5006/1.3278302

Cited by 27 publications

(32 citation statements)

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“…3, probably hydrated as the materials were derived from gel-like materials. This is in agreement with the findings of Hughes et al [8] who suggested two diffused layers of coatings with the interior being richer in Al-Mn hydrated oxides and an outer region rich in MnO2.…”

Section: Surface Morphology and Compositionsupporting

confidence: 83%

“…The coating which was developed from an acidic bath is termed to be nearly crack-free and its corrosion resistance was markedly better than the untreated alloy. However, permanganate coatings have been described by Hughes et al [8], as a promising replacement for chromates in the aerospace industry. In their findings, the coating is generally about 50-70nm in thickness and it was said to be essentially of MnO2 in its outermost regions with a composite of Al-Mn oxides predominantly at the metal/coating interphase.…”

Section: Introductionmentioning

confidence: 99%

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Development and performance of hybrid coatings on aluminium alloy

Oki

Adediran

Olayinka

et al. 2017

J. Electrochem. Sci. Eng.

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Section: Surface Morphology and Compositionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Development and performance of hybrid coatings on aluminium alloy

Oki

Adediran

Olayinka

et al. 2017

J. Electrochem. Sci. Eng.

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“…[20][21][22] Over the years, extensive research has been conducted to find environmentally friendly alternative inhibitors that perform equal or better compared to Cr(VI)-containing inhibitors. 17,[23][24][25] Among them, inorganic inhibitors such as molybdates, 26 vanadates, 27,28 permanganates, 29 and rare-earth cations (such as cerium 30,31 and praseodymium 32 ) were investigated. Furthermore, several organic compounds, including benzotriazole, dibutylphosphate, and 2-mercaptobenzothiazole, and combinations with the inorganic inhibitors demonstrated corrosion inhibition on AA2024-T3.…”

Section: Introductionmentioning

confidence: 99%

Lithium salts as leachable corrosion inhibitors and potential replacement for hexavalent chromium in organic coatings for the protection of aluminum alloys

et al. 2016

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Lithium salts are being investigated as leachable corrosion inhibitor and potential replacement for hexavalent chromium in organic coatings. Model coatings loaded with lithium carbonate or lithium oxalate demonstrated active corrosion inhibition and the formation of a protective layer in a damaged area during neutral salt spray exposure. The present paper provides an abridged overview of the initial studies into this novel inhibitor technology for the active corrosion protection of aluminum alloys. Coating defects were investigated by microscopic techniques before and after exposure to corrosive conditions. Scanning electron microscopy analysis of cross-sections of the coating defect area demonstrated that the protective layer comprises a typical threelayered structure, which included a dense layer near the alloy surface, a porous middle layer, and a flakeshaped out layer. Potentiodynamic polarization measurements obtained with a microcapillary cell positioned in the coating defect area and electrochemical impedance spectroscopy confirmed the corrosion protective properties of these protective layers. The longterm corrosion inhibition of the lithium-based coating technology was tested in industrial coating systems.

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“…Some of the most promising results were obtained with metal salts containing oxoanionic, e.g. molybdates, [11][12][13] silicates, 14 metavanadate, [15][16][17] permanganate, 18,19 phosphates, [19][20][21][22][23][24] borate 25,26 and tungstate. 16 Rare earth [27][28][29][30][31][32][33][34][35] and other cation compounds 11,13,20,[27][28][29][30][31][32][33][34][35] were also found to be effective.…”

mentioning

confidence: 99%

Protective Film Formation on AA2024-T3 Aluminum Alloy by Leaching of Lithium Carbonate from an Organic Coating

Liu

Visser

Zhou

et al. 2015

J. Electrochem. Soc.

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An investigation into corrosion inhibition properties of a primer coating containing lithium carbonate as corrosion inhibitive pigment for AA2024 aluminum alloy was conducted. It was found that, during neutral salt spray exposure, a protective film of about 0.2 to 1.5 μm thickness formed within the area where an artificial defect was introduced by scribing through the coating to the base alloy. This film showed a multilayered structure consisting of a relatively compact layer near the alloy substrate, a porous middle layer and a columnar outer layer. The thicknesses of the layers varied, as a consequence of the difference in the local concentration of lithium species leaching from the primer coating. The presence of the film in the scribed area significantly reduced corrosion of the alloy, with little consumption of the metal substrate within the scribed area during neutral salt spray exposure. Furthermore, the presence of the protective film resulted in a significant increase of impedance modulus, measured after the salt spray exposure.

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Development of Permanganate-Based Coatings on Aluminum Alloy 2024-T3

Cited by 27 publications

References 0 publications

Development and performance of hybrid coatings on aluminium alloy

Development and performance of hybrid coatings on aluminium alloy

Lithium salts as leachable corrosion inhibitors and potential replacement for hexavalent chromium in organic coatings for the protection of aluminum alloys

Protective Film Formation on AA2024-T3 Aluminum Alloy by Leaching of Lithium Carbonate from an Organic Coating

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