Ellipsometry of the passivation film on iron in neutral solution

Satô, Norio; Kudô, Kiyokatsu

doi:10.1016/0013-4686(71)85182-4

Cited by 106 publications

(55 citation statements)

References 25 publications

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“…These values correspond either to -~-Fe2Os or FesO4. However, the imaginary part of the refractive index is smaller than the range of 0.12-0.20 usually given in the literature for the same type of film (6)(7)(8). Figure 2 also shows the relationship between the thickness of the film and hP.…”

Section: !mentioning

confidence: 89%

Ellipsometric Study of the Formation of Films on Iron in Orthophosphate Solutions

Szklarska‐Śmiałowska

Staehle²

1974

J. Electrochem. Soc.

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Ellipsometry was used to study optical properties and kinetics of film growth on iron in 0.1N sodium orthophosphate solutions differing in pH. Properties and thicknesses of films grown at room temperature (22~ were found to vary within wide limits depending upon pH, potential, and presence or absence of oxygen. In aerated Na3PO4 solution, ~-Fe203 or Fe304 film is formed with a refractive index n = 2.6 and absorption coefficient k = 0.20. At anodic polarization potentials and at pH 7 or higher, iron oxide films are also formed. On the other hand, at open-circuit potentials in aerated solutions of pH 7.0 and pH 9.1, a multiple phosphate film is produced. It is composed of several layers with n values oscillating between 1.4 and 1.5, and k values from 0 to 0.14. Such a film decreases the corrosion rate of iron shifting its open-circuit potential to more noble values. As a potential is reached at which iron oxide forms, a film composed of both iron oxide and iron phosphate is produced. The growth rate of iron oxide films, and that of phosphate films at higher pH values than 7.2, follow a logarithmic law. Below pH 7.2, both in aerated and deaerated solutions, an unprotective phosphate film is formed. It is composed of several layers with n values oscillating between 1.34 and 1.36, and k values from 0.013 to 0.45. Its thickness is a linear function of time.

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Section: !mentioning

confidence: 89%

Ellipsometric Study of the Formation of Films on Iron in Orthophosphate Solutions

Szklarska‐Śmiałowska

Staehle²

1974

J. Electrochem. Soc.

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“…69 The form of Figure 1.43 is common among many metals in solutions of acidic to neutral pH of non-compIexing anions. For example, iron in moderately alkaline solution is expected to be very passive3, and so it is in borate solutions (in the absence of aggressive ions).…”

Section: : 135mentioning

confidence: 99%

Passivity and Localised Corrosion

Burstein¹

1994

Corrosion

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“…8.5 for ZnO [18,19]), m o is the permittivity of free space and q is the electronic charge. The MottSchottky plots shown in Fig.…”

Section: 9×10mentioning

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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Ellipsometry of the passivation film on iron in neutral solution

Cited by 106 publications

References 25 publications

Ellipsometric Study of the Formation of Films on Iron in Orthophosphate Solutions

Ellipsometric Study of the Formation of Films on Iron in Orthophosphate Solutions

Passivity and Localised Corrosion

Photo-induced dissolution of zinc in alkaline solutions

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