A rapid screening multi-electrode method for the evaluation of corrosion inhibitors

Muster, Tim H.; Hughés, A.E.; Furman, Scott; Harvey, T. G.; Sherman, N.; Hardin, Simon G.; Corrigan, P.; Lau, D.; Scholes, Fiona H.; White, P. A.; Glenn, A.M.; Mardel, J.; Garcia, Santiago J.; Mol, J.M.C.

doi:10.1016/j.electacta.2008.12.051

Cited by 106 publications

(60 citation statements)

References 33 publications

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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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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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“…Various corrosion inhibition strategies have been tested by traditional and rapid screening multi electrode methods. 5,[8][9][10] Among these, salts of rare earths -lanthanide and, especially, cerium salts -have been identified as being effective and environmentally acceptable. [11][12][13][14] Ce(III) salts are more soluble in water than Ce(IV) salts, which have rather low solubility.…”

mentioning

confidence: 99%

Corrosion Inhibition of Pure Aluminium and Alloys AA2024-T3 and AA7075-T6 by Cerium(III) and Cerium(IV) Salts

Rodič

Milošev

2015

J. Electrochem. Soc.

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The corrosion protection of pure aluminium and its alloys AA2024-T3 and AA7075-T6 has been studied in 0.1 M NaCl with and without the addition of Ce(III) chloride, Ce(III) nitrate, Ce(III) acetate and Ce(IV) sulfate. The study of Ce(III) acetate has been scarce but is here shown to be the most effective of the cerium salts studied, especially for AA7075-T6. The inhibition effectiveness of cerium salts is: Ce(III) acetate > Ce(III) chloride > Ce(III) nitrate for the metals studied. Ce(IV) sulfate does not inhibit corrosion. Electrochemical potentiodynamic measurements were used to investigate the mechanism of inhibition by cerium salts. Immersion tests in 0.1 M NaCl, with and without the addition of Ce(III) chloride and Ce(III) acetate, were performed to determine the effects of the inhibitors on the extent of corrosion damage at the surface of all three metals. For pure aluminium the inhibitory effectiveness was 78.5%, 82.6% and 84.0% in the presence of 3 mM Ce(III) nitrate, chloride and acetate, respectively. Aluminium and its alloys 2024-T3 (AA2024-T3) and 7075-T6 (AA7075-T6) generally have good resistance to corrosion under atmospheric conditions. They are used as construction materials, primarily in aircraft applications, because of their physical characteristics such as rigidity and high strength-to-weight ratio.1,2 The main differences between aluminium and its alloys lie in their mechanical and corrosion properties. Aluminium is cold worked, whereas AA2024-T3 and AA7075-T6 are heat treated and cold worked (T3) or artificially aged (T6). The reason for alloying aluminium is to increase strength by forming intermetallic particles, IMs.

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“…As yet, however, no alternative pigments which could replace chromates in coating layers have been fully developed. 16,17) The difficulty in developing these alternatives lies largely in the inhibition mechanisms of cut-edge corrosion and organic coating delamination by pigments: they are still unclear. It follows then that a better understanding of how pigments improve corrosion resistance will likely assist in the development of alternatives.…”

Section: Electrochemical Roles Of Anti-corrosive Pigments In Sacrificmentioning

confidence: 99%

Electrochemical Roles of Anti-corrosive Pigments in Sacrificial Corrosion Protection of Painted Galvanized Steel and their Relation to Organic Coating Delamination

et al. 2015

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A rapid screening multi-electrode method for the evaluation of corrosion inhibitors

Cited by 106 publications

References 33 publications

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

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

Corrosion Inhibition of Pure Aluminium and Alloys AA2024-T3 and AA7075-T6 by Cerium(III) and Cerium(IV) Salts

Electrochemical Roles of Anti-corrosive Pigments in Sacrificial Corrosion Protection of Painted Galvanized Steel and their Relation to Organic Coating Delamination

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