The voltammetric detection of intermediate electrochemical processes related to iron in alkaline aqueous solutions

Guzmán, R. S. Schrebler; Vilche, J. R.; Arvía, Alejandro Jorge

doi:10.1007/bf00616674

Cited by 93 publications

(67 citation statements)

References 34 publications

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“…Once the passivation of the specimen intervenes, the cathodic reduction of oxygen on as received specimens occurs at a potential lower than the values observed on pickled specimens, confirming the electrocatalytic effect of the calamine. With respect to literature data [28][29][30], the peak of the Fe/Fe(II) reaction is not present on the cyclic voltammetric curve, for all the surface conditions of the specimens. This could be due to the presence of the hot-formed oxide on the specimens, but it also shows how pickling cannot restore an iron surface completely absent from oxides.…”

Section: Stress Corrosion Testsmentioning

confidence: 47%

Effect of Hot Mill Scale on Hydrogen Embrittlement of High Strength Steels for Pre-Stressed Concrete Structures

Cabrini

Lorenzi

Pastore

et al. 2018

Metals

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Abstract:The presence of a conductive layers of hot-formed oxide on the surface of bars for pre or post-compressing structures can promote localized attacks as a function of pH. The aggressive local environment in the occluded cells inside localized attacks has as consequence the possibility of initiation of stress corrosion cracking. In this paper, the stress corrosion cracking behavior of high strength steels proposed for tendons was studied by means of Constant Load (CL) tests and Slow Strain Rate (SSR) tests. Critical ranges of pH for cracking were verified. The promoting role of localized attack was confirmed. Further, electrochemical tests were performed on bars in as received surface conditions, in order to evaluate pitting initiation. The adverse effect of mill scale was recognized.

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Section: Stress Corrosion Testsmentioning

confidence: 47%

Effect of Hot Mill Scale on Hydrogen Embrittlement of High Strength Steels for Pre-Stressed Concrete Structures

Cabrini

Lorenzi

Pastore

et al. 2018

Metals

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“…Oxidation and reduction processes occurring on an iron electrode in alkali solutions were reviewed and reported [16,17]. The first anodic peak in cyclic voltammograms is specially due to Fe(OH) 2 formation, the second anodic peak to Fe(OH) 2 with three dimensional oxide films, and the third peak to FeOOH formation [17,18] …”

Section: Resultsmentioning

confidence: 99%

“…Several mechanisms have been suggested [3][4][5][6][7][8][9] [4,5,14]. Under potentiodynamic conditions, the first anodic peak is specifically related to Fe(OH) 2 formation and the second peak to Fe(OH) 2 with three dimensional oxide film, and the third peak to FeOOH formation [15][16][17][18]. From the variation of the peak height as a function of sweep rate and hydroxide concentration [19], the film growth on the surface was assigned to low field migration of ions through an oxide/hydroxide lattice.…”

Section: Introductionmentioning

confidence: 99%

Role of Halides on the Passivation of Iron in Alkaline Buffer Solutions

Begum

Basha

Muralidharan

2010

Port. Electrochim. Acta

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Cyclic voltammetric studies were carried out on pure iron in alkaline borate and phosphate buffer solutions at pH 10.8. At higher potentials, on anodic polarization, iron forms FeB 4 O 7 and FeOOH in borate buffer, and FeHPO 4 in phosphate buffer which got converted to higher valency phosphates. In phosphate solutions, in presence of halides, the interfacial diffusion layer turned to be cation selective outer sublayer and an anion selective inner sublayer, and in borate solutions a precipitate layer of metal oxyhydroxide was formed, which was anion selective, and anions adsorb on this.

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“…[23][24][25][26][27][28][29], they have not been strictly identified. There is a general agreement however, which is as follows: Peak II is generally attributed to steel dissolution i.e.…”

Section: Second Level Subheadmentioning

confidence: 99%

Electrochemical Measurements in Cement Extract Solutions on Reinforcing Steel, Previously Conditioned in Concrete

et al. 2007

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The corrosion behavior of reinforcing steel, previously embedded in concrete and maintained in conditions of corrosion and two regimes (conventional and pulse) of cathodic protection (CP), was characterized using electrochemical measurements in cement extract (CE) solutions of pH 12.6. The investigation aimed at determination of the properties of the product layers, previously formed on the steel surface. The study further allowed evaluation of the CP effectiveness in terms of steel surface oxidation/reduction behavior in the alkaline medium of CE. Based on the similar electrochemical behavior of protected specimens, it can be concluded that the pulse CP is as effective as the conventional CP regime. Moreover, the surface film, formed in pulse CP conditions appears to be more homogeneous and resistive, compared to the conventional CP regime.

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The voltammetric detection of intermediate electrochemical processes related to iron in alkaline aqueous solutions

Cited by 93 publications

References 34 publications

Effect of Hot Mill Scale on Hydrogen Embrittlement of High Strength Steels for Pre-Stressed Concrete Structures

Effect of Hot Mill Scale on Hydrogen Embrittlement of High Strength Steels for Pre-Stressed Concrete Structures

Role of Halides on the Passivation of Iron in Alkaline Buffer Solutions

Electrochemical Measurements in Cement Extract Solutions on Reinforcing Steel, Previously Conditioned in Concrete

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