Ellipsometry as an aid in studying metallic corrosion problems

Hayfield, P. C. S.

doi:10.1016/0039-6028(76)90470-2

Cited by 18 publications

(2 citation statements)

References 8 publications

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“…13,14 In situ photocurrent measurements during Zn-oxidation are available, 15 as there are numerous electrochemical characterisation works. 13,[16][17][18][19][20][21][22] An understanding of the electronic structure, especially of the defect-related intragap states, of oxides formed on Zn in electrochemical processes is important from two perspectives. Firstly, photocorrosion processes depend on the electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and morphology of dark oxides on zinc generated by electrochemical treatment

Chen

Schneider

Liu

et al. 2013

Phys. Chem. Chem. Phys.

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Oxides formed by electrochemical treatment of metals frequently have properties and structures very different from the respective bulk oxides. Here, electronic structure and chemical composition were investigated for the oxide formed on polycrystalline zinc after electrochemical oxidation, and after subsequent reduction, in a Na2CO3 electrolyte. Photoluminescence and spectroscopic ellipsometry show the presence of states deep in the ZnO band gap in the oxidized sample, which consists of a highly disordered oxide. These states determine the absorption of light in the visible spectral range. After reduction, the characteristics of the ZnO electronic structure have disappeared, leaving a defect-dominated material with a band gap of ~1.8 eV. Complementary detailed analysis of the morphology of the resulting surfaces shows hexagon-shaped metallic Zn-"nanoplates" to be formed in the reduction step. The optical appearance of the surfaces is dark, because of their efficient extinction of light over a large part of the visible spectrum. The optical appearance is a result of changed surface morphology and electronic structure of the oxide film. Such materials may possess interesting applications in photocatalysis or photoelectrochemistry.

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Section: Introductionmentioning

confidence: 99%

Electronic structure and morphology of dark oxides on zinc generated by electrochemical treatment

Chen

Schneider

Liu

et al. 2013

Phys. Chem. Chem. Phys.

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“…28 Ellipsometry has been used to study corrosion processes under stagnant conditions. [29][30][31][32] This type of electrode configuration may be used with other techniques, such as Raman spectroscopy that , like ellipsometry, are used normally in quiescent environments. Mayer and Muller recently published results using in situ Raman spectroscopy to study the corrosion of Cu in still alkaline solutions.…”

Section: Introductionmentioning

confidence: 99%

Influence of Velocity on Corrosion of Copper in Alkaline Chloride Solutions

Diem¹,

Orazem²

1994

CORROSION

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It has been reported previously that the mechanism for the erosion-corrosion of copper (Cu) in seawater is the removal of protective layers by hydrodynamic shear. This hypothesis was tested by studying the anodic dissolution of Cu in aerated 3.5 wt% sodium chloride (NaCl) solutions using a system designed to isolate the effect of surface shear stress. The experimental apparatus consisted of an axisymmetric impinging jet and disk electrode coupled with a scanning ellipsometer. This allowed a phenomenon occurring at a critical shear stress, such as removal of protective films, to be seen at a corresponding radial position. Enhancement of the corrosion rate, as measured electrochemically, was less than would have been caused by an increase in overall convective transport. The ellipsometer did not indicate the presence of any critical radius, even though the shear stress at the Cu electrode was an order of magnitude higher than the critical shear stress reported in the literature. Therefore, the critical shear stress previously reported in the literature could not be attributed to removal of protective layers by hydrodynamic shear.

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Ellipsometric Observations of Aluminium Hydroxide Films Grown in Water Vapor

Neal

Rehal

1979

Surface Contamination

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Ellipsometry as an aid in studying metallic corrosion problems

Cited by 18 publications

References 8 publications

Electronic structure and morphology of dark oxides on zinc generated by electrochemical treatment

Electronic structure and morphology of dark oxides on zinc generated by electrochemical treatment

Influence of Velocity on Corrosion of Copper in Alkaline Chloride Solutions

Ellipsometric Observations of Aluminium Hydroxide Films Grown in Water Vapor

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