Evaluation of 4-amidinophenyl-2,2′-bithiophene and its aza-analogue as novel corrosion inhibitors for CS in acidic media: Experimental and theoretical study

Fouda, A. S.; Ismail, Mohamed A.; Elewady, G. Y.; Abousalem, Ashraf S.

doi:10.1016/j.molliq.2017.05.089

Cited by 81 publications

(34 citation statements)

References 74 publications

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“…However, during the later stage of adsorption, these inhibitors interact via their non-bonding and -electrons and form coordination bonds i.e. chemisorption [23].…”

Section: Economic Importancementioning

confidence: 99%

“…Corrosion is an inherent property of pure metals except silver, gold and platinum, and its rate largely depends upon the nature of surrounding environments [21][22][23]. Obviously, an increase in the surrounding temperature results into corresponding increase in corrosion rate [21][22][23]. Although, presence of organic inhibitors in corrosive acidic environment decreases corrosion rate, however nature of groups exerted most significant role on the inhibition effect of these inhibitors.…”

Section: Factors Affecting Corrosionmentioning

confidence: 99%

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Volatile corrosion inhibitors for ferrous and non-ferrous metals and alloys: A review

Ansari¹,

Verma²,

Siddiqui³

et al. 2018

Int. J. Corros. Scale Inhib.

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Volatile corrosion inhibitors (VCIs) or vapor phase inhibitors (VPIs) represent a class of compounds that are employed to protect the corrosion or oxidation of ferrous and nonferrous metals and alloys where other surface treatments are impractical. The VCIs release slowly inside the sealed airspace and actively adsorb and prevent corrosion. Several VCIs have been employed as effective inhibitors for several metals like iron, zinc, aluminum, etc. and their alloys. Literature study revealed that VCIs protect metallic corrosion either by forming a surface protective film on the metal surface or neutralizing the corrosive surrounding reagents H 2 O, SO 2 , H 2 S and CO 2 , etc. Because of the high volatility, VCIs easily vaporize and their vapors condense on the metallic surface as well as the volume available in the crevices, pores and cracks thereby gives complete protection where they used. The VCIs can be inserted into coatings, foams, adhesives, powders, sprays and plastics. Several VCIs are known those act as effective inhibitors by themselves and few other VCIs are also known those hydrolyzed products act as corrosion inhibitors. The inhibition ability as well as quantity of the adsorbed VCIs on metallic surfaces can be determined by several commonly employed techniques such as contact angle, radiotracer, polarographic and electrocapilarity methods. Present review article describes the assortment of previous works published on VCIs as corrosion inhibitors for ferrous and non-ferrous metals and alloys. The present report also deals with salient features of VCIs and mechanism of their action.

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“…However, during the later stage of adsorption, these inhibitors interact via their non-bonding and -electrons and form coordination bonds i.e. chemisorption [23].…”

Section: Economic Importancementioning

confidence: 99%

Section: Factors Affecting Corrosionmentioning

confidence: 99%

Volatile corrosion inhibitors for ferrous and non-ferrous metals and alloys: A review

Ansari¹,

Verma²,

Siddiqui³

et al. 2018

Int. J. Corros. Scale Inhib.

View full text Add to dashboard Cite

show abstract

“…Generally, an endothermic process has been typically characteristic to chemisorption via electron transfer from inhibitor to metal surface in order to create co-ordination bond, exothermic adsorption process indicates either physisorption or chemisorption 41 . The lone pairs of electrons in estimated molecules can be interacted with vacant MS d-orbital in order to create chemisorbed film.…”

Section: IIImentioning

confidence: 99%

Corrosion inhibition evaluation of tetraclinis articulata extract on mild steel in HCl solution

2018

jcbsc

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Herein, A study of corrosion inhibition of mild steel (MS) in 1.0 M HCl by Tetraclinis articulata extract as a green inhibitor had been achieved via chemical and electrochemical methods. Open circuit potential (OCP), Potentiodynamic polarization, electrochemical impedance spectroscopy and electrochemical frequency modulation tests had been examined. Adsorption & thermodynamic activation parameters had been recorded and evaluated. Temperature effect on the mild steel corrosion inhibition in a range between 298-328 K had been evaluated. The mild steel samples surface morphology in existence and nonexistence of Tetraclinis articulata extract had been evaluated via FT-IR spectroscopy measurements, Scanning Electron Microscopy and Atomic Force Microscopy. The gained data confirmed the protective layer formed on mild steel surface and demonstrated that the compounds which had been found in Tetraclinis articulata extract act as an effective and good inhibitors. Tafel curves demonstrated that the tested compound proceeds as a mixed-type inhibitor. The adsorption mode of Tetraclinis articulata extract had been matched with the Temkin adsorption isotherm model. The inhibition efficiency (IE%) had been found to improve with improvement of Tetraclinis articulata extract doses achieving maximum inhibition efficiency more than 80% at 298K.

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“…On the other hand, G 0 ads is related to the enthalpy (∆H°a ds ) and the entropy (∆S°a ds ) of adsorption and the according to Gibbs-Helmholtz relation as follow 19 : Plots of G 0 ads versus T for CS corrosion in presence of different (AZFD)give straight lines as shown in Figure 4. ΔS°a ds and ΔH°a ds can be obtained from the slope and the intercept of the straight lines ( Figure 4), respectively.…”

Section: Adsorption Isotherm and Thermodynamic Parametersmentioning

confidence: 99%

“…identifies functional groups present in various compounds 19 . ATR-FTIRspectra of the (AZFD)and the protective layer formed on CS surface exposed to test solution containing (AZFD)are represented in Figure 10.…”

Section: Atr-ftir and Uv/ Visible Spectral Analysis: Atr-ftirspectrosmentioning

confidence: 99%

Performance of aza furamidine derivatives as new corrosion inhibitors for CS in acid environment: The Experimental and Quantum chemical studies

2018

jcbsc

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Three azafuramidine derivatives (AZFD) as new inhibitors for the corrosion of carbon steel (CS) in acidic solution has been examined by mass loss (ML), atomic absorption spectroscopy (AAS) and electrochemical techniques. The results demonstrated that these new (AZFD) act as good inhibitors for the corrosion of CS in acidic media. The inhibition efficiency (% €) increased as the inhibitor concentrations increases. Potentiodynamic polarization (PP) study showed that (AZFD) may be classified as mixed-type inhibitors. The) adsorption of(AZFD)on metal surface showed a Langmuir isotherm route. The surface analysis of the CS was investigated using ATR-FTIR, UV/visible spectroscopy and AFM analysis. Surface analysis of CS revealed formation of a protective adsorbed surface layer composed of (AZFD). Quantum chemical calculations of the azafuramidine derivatives molecules were computed and discussed.

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Evaluation of 4-amidinophenyl-2,2′-bithiophene and its aza-analogue as novel corrosion inhibitors for CS in acidic media: Experimental and theoretical study

Cited by 81 publications

References 74 publications

Volatile corrosion inhibitors for ferrous and non-ferrous metals and alloys: A review

Volatile corrosion inhibitors for ferrous and non-ferrous metals and alloys: A review

Corrosion inhibition evaluation of tetraclinis articulata extract on mild steel in HCl solution

Performance of aza furamidine derivatives as new corrosion inhibitors for CS in acid environment: The Experimental and Quantum chemical studies

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