Changes in Polarization Resistance in the Process of Formation of Protective Phase Layers with Participation of Organic Ligands

Tkalenko, D. A.; Vyshnevs’ka, Yu. P.; Herasymenko, Yu. S.; Khirkh-Yalan, I. F.

doi:10.1007/s11003-013-9615-1

Cited by 4 publications

(6 citation statements)

References 1 publication

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“…This allows us to conclude that dense protective films are formed when their growth rate is limited by the diffusion rate of reagents or reaction products. As shown in [13], the condition for their formation can be considered the implementation of the following equation: Rp = (2DC) 0.5  t 0.5 , where D and C are the diffusion coefficient and the concentration of particles involved in the film growth process.…”

Section: Resultsmentioning

confidence: 99%

“…The dynamics of protective layers formation was studied by the magnitude of polarization resistance, which is inversely proportional to the corrosion rate and is a parameter that characterizes the thickness of the film formed on the surface [13]. Indicator P5126, which is a two-electrode electrochemical transducer consisting of two identical cylindrical electrodes made of steel 20 (diameter -6 mm, length -30 mm, area of each electrode -6 cm 2 , distance between electrodes -7 mm) was used to determine the polarization resistance.…”

Section: Methodsmentioning

confidence: 99%

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Dynamics of formation of during inhibition of steel by sulfanilamide in solutions of hydrochloric acid with different pH

Kurmakova

Bondar

Holub

et al. 2021

Phys. Chem. Solid St.

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Experimentally proved by the method of polarization resistance formation of protective layers during inhibition steel corrosion by Sulfanilamide in aqueous solutions of hydrochloric acid with different pH. It is shown the difference due to the predominance of the protonated or unprotonated form of the molecule. It was found that at predominance of protonated forms of molecules (pH £2,4) formed dense protective films and predominance of unprotonated forms of molecules (pH ³2,4) are formed layers that do not inhibit diffusion processes. Sulfanilamide provides high and stable inhibition efficiency (<90%) in acid chloride solutions in case of formation protective layers consisting of protonated molecules what to consider when use it.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Dynamics of formation of during inhibition of steel by sulfanilamide in solutions of hydrochloric acid with different pH

Kurmakova

Bondar

Holub

et al. 2021

Phys. Chem. Solid St.

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“…Polyhexamethylene guanidine (PHMG) showed high inhibitive efficiency for protection of carbon steel in acidic medium [6, 7, 13, 14] while exhibiting moderate performance in neutral aqueous saline solutions. Gravimetric measurements showed that PHMG provides 40% corrosion protection at the concentration of 30 mmol/l.…”

Section: Resultsmentioning

confidence: 99%

“…Further improvement in protective performance may be achieved by combining inorganic passivator with organic ligands that could form complexes with the metal ions. The mechanism of protective activity of complexing type inhibitors for acidic medium has been proposed and extensively studied over the last decade [ 6 , 7 ]. In such systems, protective layers are formed as a result of formation of the slightly soluble complexes of added organic ligands and the metal cations.…”

Section: Resultsmentioning

confidence: 99%

“…Deposition of such compounds on the metal surface in form of the phase layers leads to the gradual decrease in corrosion rate thus providing the efficient anticorrosive protection. The crucial parameters for ensuring high protective efficiency of the complexing type inhibitors are the high stability and low solubility of complexes with the cations of the metal being protected [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

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Metal Surface Modification for Obtaining Nano- and Sub-Nanostructured Protective Layers

et al. 2017

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Regularities of the phase protective layer formation in multicomponent systems involving inhibitors with different mechanism of protective action have been investigated. It was shown that optimization of the composition of the inhibition mixture allows to obtain higher protective efficiency owing to improved microstructure of the phase layer. It was found that mechanism of the film formation in the presence of NaNO2-PHMG is due to deposition of slightly soluble PHMG-Fe complexes on the metal surface. On the basis of the proposed mechanism, the advanced surface engineering methods for obtaining nanoscaled and sub-nanostructured functional coatings may be developed.

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Corrosion prevention and control using in situ phase layers formation via application of the complexing‐type inhibitors

Vyshnevska

Brazhnyk²

2023

Applied Research

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A set of organic ligands of different natures has been investigated as complexing‐type corrosion inhibitors for the protection of low carbon steel in an acidic medium. The inhibitive mechanism implying the formation of phase protective layers on the metal surface as a result of the complexation process of added organic ligands with the metal cations is being discussed. The results of the investigation of the influence of pH and temperature conditions on the phase layers formation dynamics have been presented. A range of practical aspects of the application of organic ligands as complexing‐type inhibitors for the formation of ultrathin coatings have been discussed. The stability constant of the metal–ligand complex and its solubility have been proposed as the basis of a predictive model for analytical assessment of their potential protective efficiency.

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Changes in Polarization Resistance in the Process of Formation of Protective Phase Layers with Participation of Organic Ligands

Cited by 4 publications

References 1 publication

Dynamics of formation of during inhibition of steel by sulfanilamide in solutions of hydrochloric acid with different pH

Dynamics of formation of during inhibition of steel by sulfanilamide in solutions of hydrochloric acid with different pH

Metal Surface Modification for Obtaining Nano- and Sub-Nanostructured Protective Layers

Corrosion prevention and control using in situ phase layers formation via application of the complexing‐type inhibitors

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