In situ Möβbauer spectroscopic study of reactions within rust layers

Stratmann, M.; Hoffmann, K.

doi:10.1016/0010-938x(89)90123-6

Cited by 185 publications

(90 citation statements)

References 32 publications

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“…The complex electrochemical behavior of iron in aqueous solution has been studied in detail in the corrosion community [4][5][6][7][8][9][10][11] and is well described. Reduction of γ-FeOOH on other substrates has been studied previously and there is a general understanding that Fe(OH) 2 is formed.…”

mentioning

confidence: 99%

In-Situ Raman Spectroscopy of α- and γ-FeOOH during Cathodic Load

Hedenstedt

Bäckström

Ahlberg

2017

J. Electrochem. Soc.

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Water reduction on corroded iron surfaces is technologically and fundamentally important. Here, the technological interest originates from the chlorate process where water reduction is the main cathodic process. Fundamentally, water reduction on oxide surfaces raises questions on the stability of the oxide and the nature of electrocatalytic surface sites. Two iron oxyhydroxides, αand γ-FeOOH, were electrodeposited on titanium substrate and their reduction processes were followed in detail with in-situ Raman spectroscopy, using low incident laser power to avoid sample damaging. Polarization to negative potentials show two reduction peaks for γ-FeOOH and one peak for α-FeOOH prior to hydrogen evolution. The characteristic Raman peaks gradually disappear as the potential is made more negative but no new peaks can be observed. δ-FeOOH was detected as an intermediate phase upon oxidation of the reduced surface layer. This indicates that Fe(OH) 2 is formed during cathodic polarization and initially re-oxidized to the isostructural δ-FeOOH. Characteristic Raman signals of the original phases appear upon further oxidation in air.

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confidence: 99%

In-Situ Raman Spectroscopy of α- and γ-FeOOH during Cathodic Load

Hedenstedt

Bäckström

Ahlberg

2017

J. Electrochem. Soc.

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“…As already mentioned, Fe/Fe 2 + redox couple present during the first measurement cycles is readily loosing influence on the recorded CPD and replaced by the increasing contribution of Fe 2 + /Fe 3 + redox system. Taking into account hydrogen loaded into the steel sample, two competing reactions are decisive for the course of CPD min : on the one hand oxide re-formation proceeds consuming residual oxygen from the atmosphere causing an increase in CPD: 23,28,33) Fe Fe e → + with absorbed hydrogen as reducing agent is proceeding at the metal-oxide interface. Protons, which are formed in this reaction, are transported through the oxide layer in order to react with atmospheric oxygen, forming water at the sample surface (5).…”

Section: Resultsmentioning

confidence: 99%

Rolling Direction Dependent Diffusion Coefficients of Hydrogen in Ferritic Steel by SDCM Charging and SKP Probing

2016

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“…Depending on the atmosphere on the exit side, various possible situations may be observed. Atmospheric oxygen, for instance, will reoxidize the Fe 2+ to Fe 3+ [29] according to the scheme proposed elsewhere [30,31]. Due to complex structure and composition of oxides, reproducibility is not easily achieved.…”

Section: Introductionmentioning

confidence: 99%

Challenges in hydrogen quantification using Kelvin probe technique at different levels of relative humidity

Burgstaller

Schimo

Hassel

2017

J Solid State Electrochem

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Kelvin probe-based contact potential measurements were conducted with in situ electrochemical hydrogen loading of a Pd membrane with a thickness of 100 μm. The theoretical basis of diffusion coefficient calculation based on measured response time of potential drop, arising from hydrogen arriving at the detection side of the Pd membrane, was discussed. In situ hydrogen loading was also utilized for insertion of different amounts of hydrogen into the Pd sample while monitoring the resulting contact potential difference changes. Measurement of contact potential difference at different final values of hydrogen concentration in the Pd membrane was performed at various atmospheric conditions, focusing in this work on increasing relative humidity (4 to 85% rH). Moreover, the effect of humidity changes on hydrogen effusion kinetics at room temperature and low oxygen content (<1%) was studied.

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In situ Möβbauer spectroscopic study of reactions within rust layers

Cited by 185 publications

References 32 publications

In-Situ Raman Spectroscopy of α- and γ-FeOOH during Cathodic Load

In-Situ Raman Spectroscopy of α- and γ-FeOOH during Cathodic Load

Rolling Direction Dependent Diffusion Coefficients of Hydrogen in Ferritic Steel by SDCM Charging and SKP Probing

Challenges in hydrogen quantification using Kelvin probe technique at different levels of relative humidity

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