Steel corrosion in diluted ammoniac solutions studied by Mössbauer spectrometry

Bibicu, I.; Samide, Adriana; Preda, Mircea

doi:10.1016/j.matlet.2004.03.043

Cited by 11 publications

(2 citation statements)

References 12 publications

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“…The optimal operating parameters can be found acting on the potential range, environment pH, or number of voltammetric cycles . Organic films have been characterized using electrochemical impedance spectroscopy (EIS), optical microscopy, scanning electron microscopy (SEM), atomic force microscopy, Mössbauer spectroscopy, or X‐ray photoelectron spectroscopy analysis . In addition, the experimental data were associated with theoretical studies and quantum chemistry calculations providing significant information about action mechanism of corrosion inhibitors …”

Section: Introductionmentioning

confidence: 99%

Anticorrosive coating based on poly(vinyl acetate) formed by electropolymerization on the copper surface

Samide

Brãtulescu

Merişanu

et al. 2018

J of Applied Polymer Sci

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The poly(vinyl acetate) (PVAC) film was obtained by electropolymerization on the copper electrode using cyclic voltammetry performed in mixed electrolyte based on water/ethyl alcohol/acetic acid containing vinyl acetate (VAc) and benzoyl peroxide as polymerization initiator. The coatings were characterized by optical microscopy, scanning electron microscopy (SEM) and infrared (IR) spectroscopy. The corrosion was induced in hydrochloric acid solution using potentiodynamic measurements and electrochemical impedance spectroscopy (EIS). The microscopic and SEM images revealed the PVAC coating formation and IR spectroscopy confirmed that it exhibits the same characteristic bands as a standard PVAC sample. From the potentiodynamic polarization, the PVAC protective performance of 78% was computed. The EIS measurements showed the occurrence of the surface adsorbed layer with a higher impedance response to the frequency and a phase angle maximum shifted to lower values than those of uncoated samples. In addition, the VAc electropolymerization mechanism was discussed and the PVAC adsorption mechanism on the copper surface was proposed. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47320.

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Section: Introductionmentioning

confidence: 99%

Anticorrosive coating based on poly(vinyl acetate) formed by electropolymerization on the copper surface

Samide

Brãtulescu

Merişanu

et al. 2018

J of Applied Polymer Sci

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“…[37] The best fitting of the TMS spectrum shows the presence of a single sextet. The parameters of this sextet are the same as for a α-Fe sample.…”

Section: Mössbauer Spectroscopymentioning

confidence: 97%

Kinetics corrosion process of carbon steel in hydrochloric acid in absence and presence of 2‐(cyclohexylaminomercapto) benzothiazole

Samide

Bibicu

2008

Surface & Interface Analysis

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The corrosion and inhibition behavior of carbon steel in 1 M HCl in the presence of 2-(cyclohexylaminomercapto) benzothiazole (CMB) was investigated using weight-loss measurements, galvanostatic polarization studies and UV-VIS spectrophotometry. The morphology of a surface was analyzed by using Mössbauer spectroscopy. Some samples were examined by scanning electron microscopy. The inhibition efficiency increased with increasing CMB concentration and decreased with increasing temperature of the corrosion medium. The activation energy (E a ) was determined from Arrhenius equation. The activation enthalpy ( H 0 ) and the activation entropy ( S 0 ) were calculated from the diagram of the transition state. The experimental results suggest that the presence of CMB in the solution increases the surface coverage (θ ) and therefore, indicates the adsorption of CMB. The adsorption of this compound on the metal surface is found to obey Langmuir's adsorption isotherm. The UV-VIS spectrophotometry shows a decrease of the concentration of CMB in HCl solution after corrosion, indicating that an adsorption process occurs between an organic compound from aqueous phase and the electrode surface. From the Mössbauerspectroscopy studied at this stage, it is expected that the main product of corrosion is a nonstoichiometric amorphous Fe 3+ oxyhydroxide, consisting of a mixture of α, β and γ -FeOOH, where γ -FeOOH is the main phase.

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Surface study of inhibitor films formed by polyvinyl alcohol and silver nanoparticles on stainless steel in hydrochloric acid solution using convolutional neural networks

Samide

Stoean

2019

Applied Surface Science

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Steel corrosion in diluted ammoniac solutions studied by Mössbauer spectrometry

Cited by 11 publications

References 12 publications

Anticorrosive coating based on poly(vinyl acetate) formed by electropolymerization on the copper surface

Anticorrosive coating based on poly(vinyl acetate) formed by electropolymerization on the copper surface

Kinetics corrosion process of carbon steel in hydrochloric acid in absence and presence of 2‐(cyclohexylaminomercapto) benzothiazole

Surface study of inhibitor films formed by polyvinyl alcohol and silver nanoparticles on stainless steel in hydrochloric acid solution using convolutional neural networks

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