Corrosion and hydrogen permeation inhibition for mild steel in HCl by isomers of organic compounds

Babu, B. Ramesh; Holze, Rudolf

doi:10.1179/000705900101501254

Cited by 43 publications

(5 citation statements)

References 12 publications

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“…It is found that poly ( p ‐toluidine) obeys Languimer isotherm. The higher inhibitive property of poly( p ‐toluidine) is also due to the presence of π electrons, quaternary nitrogen atom and the larger molecular size which ensures greater coverage of the metallic surface 6–16. Similarly the reflectance study (Fig.…”

Section: Resultsmentioning

confidence: 78%

The inhibitive effect of poly(p‐toluidine) on corrosion of iron in 1M HCL solutions

Manivel

Venkatachari

2007

J of Applied Polymer Sci

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In recent years, polymer amines have been recognized as an excellent corrosion inhibitors for iron in acid solutions. In this work, the inhibitive effect of p-toluidine and poly(p-toluidine) on corrosion of iron in 1M HCl has been studied by the electrochemical methods such as impedance, linear polarization, Tafel polarization techniques. The effectiveness of poly(p-toluidine) was found to be high in comparison with that of monomer. The results showed that p-toluidine and poly(p-toluidine) suppressed both cathodic and anodic processes of iron dissolution in 1M HCl. The inhibition efficiency of both p-toluidine and poly(p-toluidine) were found to increase with the inhibitor concentrations.

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Section: Resultsmentioning

confidence: 78%

The inhibitive effect of poly(p‐toluidine) on corrosion of iron in 1M HCL solutions

Manivel

Venkatachari

2007

J of Applied Polymer Sci

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“…There is no general relationship, though. The search for corrosion inhibitors of mild steel in 1 M HCl revealed that ortho-nitroaniline and ortho-methyloaniline show higher corrosion inhibition efficiency in comparison with both meta- and para-substituents, but in the case of phenlylenediamine, meta-substituted functional groups offered the highest efficiency [45]. A similar observation was made on aminophenol-N-salicylidene isomers’ action towards zinc in 0.5 M H 2 SO 4 [46].…”

Section: Introductionmentioning

confidence: 78%

Corrosion Inhibition Mechanism and Efficiency Differentiation of Dihydroxybenzene Isomers Towards Aluminum Alloy 5754 in Alkaline Media

et al. 2019

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The selection of efficient corrosion inhibitors requires detailed knowledge regarding the interaction mechanism, which depends on the type and amount of functional groups within the inhibitor molecule. The position of functional groups between different isomers is often overlooked, but is no less important, since factors like steric hinderance may significantly affect the adsorption mechanism. In this study, we have presented how different dihydroxybenzene isomers interact with aluminum alloy 5754 surface, reducing its corrosion rate in bicarbonate buffer (pH = 11). We show that the highest inhibition efficiency among tested compounds belongs to catechol at 10 mM concentration, although the differences were moderate. Utilization of novel impedance approach to adsorption isotherm determination made it possible to confirm that while resorcinol chemisorbs on aluminum surface, catechol and quinol follows the ligand exchange model of adsorption. Unlike catechol and quinol, the protection mechanism of resorcinol is bound to interaction with insoluble aluminum corrosion products layer and was only found efficient at concentration of 100 mM (98.7%). The aforementioned studies were confirmed with Scanning Electron Microscopy and X-ray Photoelectron Spectroscopy analyses. There is a significant increase in the corrosion resistance offered by catechol at 10 mM after 24 h exposure in electrolyte: from 63 to 98%, with only negligible changes in inhibitor efficiency observed for resorcinol at the same time. However, in the case of resorcinol a change in electrolyte color was observed. We have revealed that the differentiating factor is the keto-enol tautomerism. The Nuclear Magnetic Resonance (NMR) studies of resorcinol indicate the keto form in structure in presence of NaOH, while the chemical structure of catechol does not change significantly in alkaline environment.

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“…Further, it has been reported that aniline has got low bonding energy with iron 35. However, if the hydrogen atom of aniline is substituted by methyl or amino group, it showed higher inhibition efficiency than aniline because of strong binding of inhibitor molecule to the metal surface 36. A comparison of inhibition efficiency for anisidines with those for aniline and amino phenol, which is reported elsewhere,37 clearly brings out the fact that anisidines are more inhibitive than the other two, because of the presence of electron releasing OCH 3 group with increased molecular area 38.…”

Section: Resultsmentioning

confidence: 99%

Polyaniline as corrosion inhibitor for iron in acid solutions

Jeyaprabha

Sathiyanarayanan

Venkatachari

2006

J of Applied Polymer Sci

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ABSTRACT:In recent years, polymer amines have been studied as an efficient corrosion inhibitor for iron in acid media. In this article, the performance of water soluble polyaniline as corrosion inhibitor for iron in 0.5M H 2 SO 4 has been evaluated by potentiodynamic polarization, linear polarization, and electrochemical impedance spectroscopy and compared with the performance of the aniline monomer. It has been found that polyaniline is an efficient inhibitor, since the maximum efficiency of 84% has been observed at a concentration of 100 ppm, whereas the monomer has accelerated the corrosion. FTIR studies have shown that the polyaniline is strongly adsorbed on the iron surface and inhibits the corrosion effectively. However, aniline has been found to improve the passivation tendency of iron at higher concentrations.

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Corrosion and hydrogen permeation inhibition for mild steel in HCl by isomers of organic compounds

Cited by 43 publications

References 12 publications

The inhibitive effect of poly(p‐toluidine) on corrosion of iron in 1M HCL solutions

The inhibitive effect of poly(p‐toluidine) on corrosion of iron in 1M HCL solutions

Corrosion Inhibition Mechanism and Efficiency Differentiation of Dihydroxybenzene Isomers Towards Aluminum Alloy 5754 in Alkaline Media

Polyaniline as corrosion inhibitor for iron in acid solutions

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