Cr(VI) and Ce(III) Inhibition of Oxygen Reduction on Copper

Kendig, M.; Jeanjaquet, S.

doi:10.1149/1.1430717

Cited by 82 publications

(58 citation statements)

References 12 publications

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“…20,48,[50][51][52] To obtain Ce(IV) in aqueous solution, however, requires a strong oxidizing agent such as hydrogen peroxide.…”

Section: Anodic Hardening Processmentioning

confidence: 99%

“…20,47,50,52,53 For example, after simple immersion in Ce(III) the orange DCP data in Figure 37 show that the OCP of the TCP-passivated AA2024-T3 alloy shifts to lower potential, which implies a strong cathodic inhibition effect that is related to passivation of the intermetallic inclusions on the alloy surface. 19,45,47 Typically Cu-rich inclusions provide cathodic sites for proton reduction reaction due to its galvanic effect.…”

Section: In Situ Nr Of Ce(iii) Cathodic Hardeningmentioning

confidence: 99%

“…Additional Ce(OD) 3 precipitation at Al/TCP interface is consistent with the currently accepted mechanism for Ce(III) cathodic inhibition. 45,47,52 Ce(III) precipitation is accompanied by the additional water, which swells the film, allowing Ce(III) to pass through and reach the high pH region at the TCP/Al interface. 20 The swelling stage triggers Ce(III) to precipitate.…”

Section: Ce(iii) Precipitation At Al/tcp Interfacementioning

confidence: 99%

“…This scenario is consistent with the observation that TCP passivated AA2024-T3 exhibits a reduced OCP after 24 hour immersion (orange curve in Figure 37), due to localized cathodic inhibition on noble intermetallic. 19,46,47,52 The concentration of Ce species in the inhibited TCP layer can be estimated based on the same numerical model used in previous section, which assumes that the content of D 2 O, H 2 O, Cr and Zr in the TCP layer does not change as the Ce species penetrates the film.…”

Section: Ce(iii) Precipitation At Al/tcp Interfacementioning

confidence: 99%

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Morphology and Mechanism of Benign Inhibitors

Schaefer¹,

Wang²,

Xin³

2012

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“…20,48,[50][51][52] To obtain Ce(IV) in aqueous solution, however, requires a strong oxidizing agent such as hydrogen peroxide.…”

Section: Anodic Hardening Processmentioning

confidence: 99%

Section: In Situ Nr Of Ce(iii) Cathodic Hardeningmentioning

confidence: 99%

Section: Ce(iii) Precipitation At Al/tcp Interfacementioning

confidence: 99%

Section: Ce(iii) Precipitation At Al/tcp Interfacementioning

confidence: 99%

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Morphology and Mechanism of Benign Inhibitors

Schaefer¹,

Wang²,

Xin³

2012

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“…It is generally believed that corrosion inhibitors effectively eliminate the undesirable destructive effects of aggressive media and prevent copper dissolution. Organic compounds containing polar groups including nitrogen, sulphur, and oxygen [15][16][17] and heterocyclic compounds with polar functional groups and/or conjugated double bonds [18][19] have been reported to inhibit copper corrosion. The inhibiting action of these compounds is usually attributed to their interactions with the copper surface via their adsorption.…”

Section: Introductionmentioning

confidence: 99%

Determination of Trace Metals by Differential Pulse Voltammetry at Chitosan Modified Electrodes

Martínez‐Huitle¹,

Fernandes²,

Cerro‐López³

et al. 2010

Port. Electrochim. Acta

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The inhibition of copper corrosion in 3.5% NaCl solution has been studied at 25 o C using three inhibitors: 1-phenyl-2,4-dithiobiuret(Inh I), 1-p-methoxyphenyl-2,4-dithiobiuret(Inh II) and 1-p-chlorophenyl-2,4-dithiobiuret(Inh III). The inhibition efficiencies of these compounds have been evaluated by weight loss and electrochemical methods (impedance spectroscopy and polarisation curves). The surface study was done by using SEM and ESCA techniques. The inhibition efficiencies of the inhibitors follow the sequence Inh II > Inh I > Inh III. The inhibitors Inh I, Inh II and Inh III appear to inhibit corrosion process through the formation of a protective film which was found to consist of Cu(I)-inhibitor complex, cuprous chloride CuCl or CuCl 2 -complex ions or both on the surface. .

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Influence of drying temperature on the corrosion performance of chromate coatings on galvanized steel

Zhang¹,

Böhm

Bosch

et al. 2004

Materials & Corrosion

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The influence of drying temperature on the corrosion performance of chromate coatings on electro-galvanized (EG) steel has been investigated using electrochemical impedance spectroscopy (EIS) and potentiodynamic measurements in 3.5% NaCl solutions. The chromate coatings were applied to the EG steel in a solution (pH 1.2) containing sodium dichromate and sulfuric acid at room temperature. The coatings were dried in an oven at three different temperatures: 60, 110 and 210 8C. The surface of the chromate coatings was analyzed using atomic force microscopy (AFM) and scanning electron microscopy (SEM) combined with energy-dispersive spectrometry (EDS). The results show that the drying temperature significantly affects the morphology of the chromate coatings and consequently affects their corrosion behavior. The chromate coatings dried at 110 8C had few cracks and the lowest corrosion current. The chromate coatings dried at 60 8C showed passivity. The EIS results show that the chromate coatings dried at 60 8C has the largest impedance in a neutral 3.5% NaCl solution. Drying at higher temperature (210 8C) degrades the chromate coatings by widening the cracks and reducing soluble Cr(VI) in the chromate layer. The favorable drying temperature for the chromate coatings on the EG steel is between 60 and 110 8C.

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Cr(VI) and Ce(III) Inhibition of Oxygen Reduction on Copper

Cited by 82 publications

References 12 publications

Morphology and Mechanism of Benign Inhibitors

Morphology and Mechanism of Benign Inhibitors

Determination of Trace Metals by Differential Pulse Voltammetry at Chitosan Modified Electrodes

Influence of drying temperature on the corrosion performance of chromate coatings on galvanized steel

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