An electrochemical study of the atmospheric corrosion of iron—II. Cathodic and anodic processes on uncorroded and pre-corroded iron

Cox, AP; Lyon, S.B.

doi:10.1016/0010-938x(94)90142-2

Cited by 34 publications

(15 citation statements)

References 18 publications

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“…The role of pH is fundamental in redox reactions, where lowering the pH significantly lowers the redox potential required to initiate reduction. This may explain the release of redox-sensitive Mn from dried soils and may play a role in the passivation of iron corrosion, which is known to be pH-dependent [8] toward the final stages of surface drying.…”

Section: Resultsmentioning

confidence: 97%

“…It has been speculated that H-bonding and therefore the stability of humic compounds is affected by drying [6]. Surface charge and metal bonding of colloidal oxides change with hydration state [7] and the chemical conditions associated with wetting and drying are known to be fundamental to atmospheric corrosion of iron [8]. These examples from varying fields of research highlight the need for a real-time, in situ probe to elucidate chemical changes that occur during the removal of water from a drying surface.…”

Section: Introductionmentioning

confidence: 99%

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A new method for gaining insight into the chemistry of drying mineral surfaces using ATR-FTIR

Dowding

Borda

Fey

et al. 2005

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

A new method for gaining insight into the chemistry of drying mineral surfaces using ATR-FTIR

Dowding

Borda

Fey

et al. 2005

Journal of Colloid and Interface Science

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“…The measurements were two-electrode measurements with noreference electrode. Lyon and coworkers [3][4][5][6][7] measured electrochemical kinetics in layers as thin as 50 µm using an essentially bulk electrochemistry approach involving a capillary connection to a remote RE and CE.…”

Section: Introductionmentioning

confidence: 99%

Potential control under thin aqueous layers using a Kelvin Probe

et al. 2007

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Kelvin Probes can be modified to control as well as monitor potential. The design and operation of two different Kelvin Probe Potentiostats (KPPs) are described in this paper. One approach uses a permanent magnet and double coil to oscillate the needle at a fixed frequency, an AC backing potential, and software analysis and control schemes. This technique can also control the distance between the tip and sample, thereby tracking the topography of the sample. Both KPPs were used to make measurements on Type 304L stainless steel under thin layers of electrolyte. Cathodic polarization curves exhibited a limiting current density associated with oxygen reduction. The limiting current density varied with solution layer thickness over a finite range of thickness. Anodic polarization curves on 304L in a thin layer of chloride solution resulted in pitting corrosion. The breakdown potential did not vary with solution layer thickness. However, the thin layer was observed to increase in volume remarkably during pit growth owing to the absorption of water from the high humidity environment into the layer with ionic strength increased by the pit dissolution. The open circuit potential (OCP) and solution layer thickness were monitored during drying out of a thin electrolyte layer. Pitting corrosion initiated, as indicated by a sharp drop in the OCP, as the solution thinned and increased in concentration.

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“…It implies that at least one constitutive phase of the corrosion product layer is able, when it is in contact with the metal, to consume the electron produced by the anodic reaction of iron oxidation by reducing itself and then forming a conductive reduced phase. For most authors, the Fe(III) phase that is reduced is assumed to be the lepidocrocite (γ-FeOOH) [18,25,26]. Identifying the phase obtained after reduction has been less studied.…”

Section: Studying Atmospheric Corrosion Mechanismsmentioning

confidence: 99%