Electrochemical study of corrosion inhibition and adsorption behaviour for pure iron by polyacrylamide in H2SO4: Synergistic effect of iodide ions

Umoren, Savıour A.; Li, Y.; Wang, F.H.

doi:10.1016/j.corsci.2010.01.026

Cited by 171 publications

(47 citation statements)

References 54 publications

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“…For example, the inhibition efficiency (g%) increased from 26 to 72% on addition of 5 mM KI to 2 9 10 -3 M PAA for mc-Al compared to an increase from 23 to 59% for pc-Al. The mechanism of this synergistic effect has been described in detail in the literature [27][28][29]. The iodide ions are strongly chemisorbed on the corroding Al surface and facilitate PAA adsorption by acting as intermediate bridges between the positively charged metal surface and PAA polycation.…”

Section: Potentiodynamic Polarization Measurementsmentioning

confidence: 96%

Effect of aluminium microstructure on corrosion and inhibiting effect of polyacrylic acid in H2SO4 solution

Umoren

Wang

2010

J Appl Electrochem

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The corrosion behaviour of a microcrystalline aluminium (mc-Al) coating fabricated from pure cast aluminium substrate by magnetron sputtering and the pure polycrystalline aluminium (pc-Al) were studied using electrochemical impedance spectroscopy and potentiodynamic polarization techniques in aerated 0.5 M H 2 SO 4 at 30 ± 1°C. The corrosion inhibiting effect of polyacrylic acid (PAA) and synergistic effect of iodide ions was also investigated. Results obtained show that surface microcrystallization increases the corrosion susceptibility of pure cast aluminium leading to decrease in interfacial impedance and an increase in the kinetics of the anodic dissolution. Introduction of PAA into the corrosive medium was observed to retard the corrosion rates of both specimens. The inhibition mechanism was affected by the microstructure of the sample. PAA functions as a mixed inhibitor but under cathodic control for pc-Al and under anodic control for mc-Al. Addition of iodide ions synergistically increased the inhibition efficiency of PAA and this effect was more pronounced with mc-Al.

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Section: Potentiodynamic Polarization Measurementsmentioning

confidence: 96%

Effect of aluminium microstructure on corrosion and inhibiting effect of polyacrylic acid in H2SO4 solution

Umoren

Wang

2010

J Appl Electrochem

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“…Benabdellah et al [20] in their investigation on the inhibiting abilities of two copolymers namely, poly (vinyl caprolactone-co-vinyl pyridine) and poly (vinyl imidazol-co-vinyl pridine) on the corrosion behavior of steel in phosphoric acid at different temperatures, concluded that these copolymers have excellent inhibitive effects. Similarly, additions of halides to polymers have been reported to significantly modify the inhibitive efficiency of polymers [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Recent Developments on the Use of Polymers as Corrosion Inhibitors - A Review

Umoren

Solomon²

2014

TOMSJ

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111

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Abstract:The use of corrosion inhibitors is the one the most economical and practical means of controlling metallic corrosion in different corrosive media. Interest on the use of eco-friendly organic compounds as corrosion inhibitors has extended to the use of polymers to inhibit metallic corrosion. The use of polymers as corrosion inhibitors has attracted attention and has gained wide acceptance in recent times. This has been attributed to a number of factors namely: (i) they are low cost and stable to metallic materials in acid media, (ii) they possess multiple adsorption sites, (iii) through their functional groups, they form complexes with metal ions and on the metal surface these complexes occupy a large area, thereby blanketing the surface and protecting the metal from corrosive agents present in the solution. A number of synthetic and natural polymers as metallic corrosion inhibitors have been investigated and reported. As an update to previous review work on the use of polymers as corrosion inhibitors, the present review presents most of the contributions made to the literature on the use of polymers as corrosion inhibitors of diverse metals in different corrosive media in the last four (2010)(2011)(2012)(2013) years.

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“…data. It occurs due to roughness and inhomogeneity of the metal surfaces [20,21]. The transfer function can be represented by a solution resistance R s , shorted by a capacitor C that is placed in parallel to the charge transfer resistance R ct :…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Inhibitory Action ofFuntumia elasticaExtracts on the Corrosion of Q235 Mild Steel in Hydrochloric Acid Medium: Experimental and Theoretical Studies

Chidiebere

Oguzie

Liu

et al. 2014

Journal of Dispersion Science and Technology

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The inhibiting effect of aqueous extracts of Funtumia elastica (FE) on mild steel corrosion in 1 M HCl solution was investigated using electrochemical and surface characterization techniques. The results revealed that FE effectively inhibited the corrosion reaction. Polarization data reveal that the extract functioned as a mixed-type inhibitor, while impedance results show that the extract organic matter adsorbed on the metal/solution interface. FT-IR, SEM and AFM results confirmed the formation of a protective layer of extract adsorbed on the mild steel surface. Adsorption of some organic constituents of FE on mild steel was theoretically described by quantum chemical computations and molecular dynamics simulations, in the framework of the density functional theory (DFT).

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Electrochemical study of corrosion inhibition and adsorption behaviour for pure iron by polyacrylamide in H2SO4: Synergistic effect of iodide ions

Cited by 171 publications

References 54 publications

Effect of aluminium microstructure on corrosion and inhibiting effect of polyacrylic acid in H2SO4 solution

Effect of aluminium microstructure on corrosion and inhibiting effect of polyacrylic acid in H2SO4 solution

Recent Developments on the Use of Polymers as Corrosion Inhibitors - A Review

Inhibitory Action ofFuntumia elasticaExtracts on the Corrosion of Q235 Mild Steel in Hydrochloric Acid Medium: Experimental and Theoretical Studies

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