The corrosion and photocorrosion of zinc and zinc oxide coatings

Spathis, P.; Poulios, Ioannis

doi:10.1016/0010-938x(95)80001-8

Cited by 121 publications

(74 citation statements)

References 4 publications

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“…This increase in the corrosion rate was associated with a light-induced increase in the rate of the oxygen reduction reaction, but no changes in the anodic polarization behaviour were observed. Spathis and Poulios [12] observed the photo-corrosion of zinc and zinc oxide coatings in a 3.5% NaCl solution on illumination with white light. On exposing the zinc electrodes to the chloride solution an initial more rapid formation of corrosion products occurred under illumination conditions than in the dark.…”

Section: Introductionmentioning

confidence: 99%

Photo-induced dissolution of zinc in alkaline solutions

Rudd

Breslin

2000

Electrochimica Acta

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The passive behaviour of zinc in an alkaline pH 13.0 solution under dark and illumination conditions has been studied using dc polarization and ac impedance techniques. Illumination with polychromatic light in the wavelength region 200-900 nm caused significant dissolution of anodically formed passive layers on zinc. This was evident from increased anodic currents, a ten-fold decrease in the charge transfer resistance and an increase in the capacitance of the passive layer. The photo-induced dissolution effect was only slightly evident under open-circuit conditions, where a precipitated or adsorbed layer forms on the electrode. These results are explained in terms of the n-type semi-conducting properties of ZnO.

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Section: Introductionmentioning

confidence: 99%

Photo-induced dissolution of zinc in alkaline solutions

Rudd

Breslin

2000

Electrochimica Acta

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“…This mayb ea ttributed to severalf actors, such as weak light absorption in the visible range of the solar spectrum [18] and recombination of the photogenerated chargec arriers, whichi s ascribed to inefficient chargeseparation. [19][20][21][22] Owing to its promisingp roperties, such as chemical stability, photocatalytic activity,a nd nontoxic nature, anatase TiO 2 has been proven to be an exceptionally good photocatalystt o date. [23] However,i ts large bandgap ( % 3.0-3.2 eV) makes it a less desirable materialf or visible-light absorption.…”

Section: Introductionmentioning

confidence: 99%

Visible‐Light Photoreduction of CO₂ to CH₄ over ZnTe‐Modified TiO₂ Coral‐Like Nanostructures

Ehsan

Khan

2017

ChemPhysChem

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Rapidly depleting fossil fuels and the related environmental issues are two alarming global concerns the world is facing today. To address these issues efficiently, future energy requirements need to be fulfilled by renewable and environmentally friendly resources. In this context, we report the ZnTe‐modified TiO2 photocatalysts with varying amounts of ZnTe (1.96, 16, and 65 %) for the photoreduction of carbon dioxide into methane under visible light. The hydrothermally synthesized photocatalysts have been characterized by using various techniques, such as X‐ray diffraction, scanning electron microscopy coupled with energy‐dispersive X‐ray spectroscopy, transmission electron microscopy, UV/Vis spectroscopy, X‐ray photoelectron spectroscopy and Brunauer–Emmett–Teller (BET) analysis for surface‐area measurements. The photocatalyst with 1.96 % ZnTe shows the best results, which are attributed to its high BET specific surface area and the formation of a heterojunction at the interface, which can facilitate efficient charge transfer.

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“…There have been reports that irradiation of the passive films formed on zinc, copper and copper -nickel alloys causes changes in the passive behaviour of the electrodes [21][22][23][24][25][26][27][28][29]. For example, Kruger [21] showed that illumination of a copper surface in water with white light reduced considerably the rate of formation of Cu 2 O. Chagas et al [22], on measuring the weight loss of copper in H 2 SO 4 solutions, found that the weight loss of copper was higher under conditions of illumination.…”

Section: Introductionmentioning

confidence: 99%

“…In other reports, it has been shown that illumination of Cu-Ni alloys renders the passive layers more resistant to the onset of localised attack [24,25]. In the case of pure zinc, it has been shown that illumination leads to an increase in the corrosion rate in chloride-containing solutions [26,27] and in alkaline solutions [28,29]. However, there have been no reports on the effects of irradiation on the passivity of CuZn alloys.…”

Section: Introductionmentioning

confidence: 99%

The electrochemical behaviour of CuZn under conditions of illumination

Rudd

Breslin

2000

Electrochimica Acta

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The influence of UV illumination on the passive behaviour of Cu37Zn in pH 9.2 and 13.0 chloride-containing electrolytes was studied using potentiodynamic polarisation tests, cyclic voltammetry and complex impedance spectroscopy. It was found that UV illumination exerted a slight activating effect on the passive behaviour in the alkaline pH 13.0 solution, with slightly higher passive current densities being recorded under conditions of illumination. A more pronounced UV illumination effect was observed in the pH 9.2 solution. This was characterised by a 4-fold increase in the passive current density, a shift in the breakdown potential by 250 mV in the active direction, a decrease in the charge transfer resistance and an increase in the double layer capacitance. These results are explained in terms of the nature of the passive film on CuZn, which consists of a complex layer involving ZnO · xH 2 O and Cu 2 O/CuO. On illumination, photo-decomposition of the n-type ZnO phase occurs leading to a modification of the passive layer rendering it more susceptible to pitting attack in the chloride environments.

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The corrosion and photocorrosion of zinc and zinc oxide coatings

Cited by 121 publications

References 4 publications

Photo-induced dissolution of zinc in alkaline solutions

Photo-induced dissolution of zinc in alkaline solutions

Visible‐Light Photoreduction of CO₂ to CH₄ over ZnTe‐Modified TiO₂ Coral‐Like Nanostructures

The electrochemical behaviour of CuZn under conditions of illumination

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The corrosion and photocorrosion of zinc and zinc oxide coatings

Cited by 121 publications

References 4 publications

Photo-induced dissolution of zinc in alkaline solutions

Photo-induced dissolution of zinc in alkaline solutions

Visible‐Light Photoreduction of CO2 to CH4 over ZnTe‐Modified TiO2 Coral‐Like Nanostructures

The electrochemical behaviour of CuZn under conditions of illumination

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Visible‐Light Photoreduction of CO₂ to CH₄ over ZnTe‐Modified TiO₂ Coral‐Like Nanostructures