Inhibitory Action of<i>Funtumia elastica</i>Extracts on the Corrosion of Q235 Mild Steel in Hydrochloric Acid Medium: Experimental and Theoretical Studies

Chidiebere, Maduabuchi A.; Oguzie, Emeka E.; Liu, Li; Liu, Ying; Wang, Fuhui

doi:10.1080/01932691.2014.956114

Cited by 15 publications

(5 citation statements)

References 43 publications

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“…A thorough examination of the plots revealed that in 1.2 M H 2 SO 4 and 0.3 M H 2 SO 4 acid concentrations, the existence of BKL in the test solution pushed the anodic and cathodic side to the minimum current values. 38 It is evident that the BKL extract obstructed the anodic and cathodic sites from further reactions. The electrochemical variables, namely corrosion potential E corr , and corrosion current densities i corr generated from this experiment are listed in Table 6.…”

Section: Potentiodynamics Polarizationmentioning

confidence: 99%

“…[43][44] Constant phase element (CPE) is employed to substitute a capacitor to envisage the shifting mechanism due to the dark densely flakes on the electrode. The impedance of the CPE is denoted by: 38 Z CPE = Q -1 (jw) -n (13) where Q and n are associated with CPE and exponent, respectively, j 2 = -1 is regarded as the imaginary axis, ù stands for angular frequency in rads -1 , (ù = 2ðf explains the frequency in H Z ), R S signifies solution resistance, W denotes the impedance factor and n is the considered shifting factor which explains the surface heterogeneity, impurities and surface fractions of the metal. 45 Addition of BKL extract in the blank solution assisted in promoting the radius of the imperfect circle, which denotes the impeding of the corrosion, and it corresponds to R ct of the steel surface.…”

Section: Electrochemical Impedance Studymentioning

confidence: 99%

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Evaluation of Bitter Kola Leaf Extract as an Anticorrosion Additive for Mild Steel in 1.2 M H2SO4 Electrolyte

Anadebe¹,

Nnaji

Okafor

et al. 2021

S.Afr.j.chem.

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Plant-based material, namely bitter kola leaf, as an additive for surface modification of mild steel in H 2 SO 4 solution was thoroughly scrutinized using electrochemical, theoretical and optimization techniques. The functional groups, of the biomolecules of the bitter kola leaf extract, were examined using Fourier transform infrared spectrometry (FTIR) and gas chromatography-mass spectrophotometry (GC-MS). For clarification purpose, scanning electron microscopy (SEM) was used to inspect the texture of the degraded and inhibited steel after 21 h of immersion. For the response surface methodology (RSM), central composite design of Design-Expert Software was used to optimize the inhibition efficiency as a function of acid concentration, inhibitor concentration, temperature and time. The optimum inhibition efficiency of 93 % was obtained at 0.9 g L -1 bitter kola leaf. The mutual correlation between the considered variables and expected response was adequately interpreted by a quadratic model. The fitness of the model was justified by the following standards which include P-value (<0.0001), adjusted R 2 (0.9843), R 2 (0.991), adequate precision (43.14) and coefficient of variation (2.59). Bitter kola leaf extract behaved as a mixed-type inhibitor and adequately satisfied Langmuir adsorption isotherm. Furthermore, the theoretical modelling revealed the most active molecule of bitter kola leaf responsible for the overall inhibition. The experimental and theoretical results are in agreement that bitter kola leaf extract is a viable corrosion inhibitor of mild steel in H 2 SO 4 solution.

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Section: Potentiodynamics Polarizationmentioning

confidence: 99%

Section: Electrochemical Impedance Studymentioning

confidence: 99%

Evaluation of Bitter Kola Leaf Extract as an Anticorrosion Additive for Mild Steel in 1.2 M H2SO4 Electrolyte

Anadebe¹,

Nnaji

Okafor

et al. 2021

S.Afr.j.chem.

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“…As a result, it follows that the limitation of corrosion action under the influence of acidic conditions and the presence of chloride ions are significant issues deserving of thorough research [143]. Several plant extracts, including Funtumia elastica [144], Musa paradisica [145], watermelon rind [146], Pimenta dioica [147], Thymus vulgaris [148], Cissus quadrangularis [149], Polygonatum odaratum [150], Ircinia strobilina [151], Tithonia diversifolia [152] and Boscia senegalensis [153], are used as corrosion inhibitors in 1M HCl. The combination of diethyl ether and ethyl acetate at 0.5 g/L was found to have the maximum IE when the corrosion inhibition activity of Ptychotis verticillate [154] was examined for MS, and it had respective conversion rates of 75% and 86%.…”

Section: Comparative Analysis 61 Comparison Of 1m Hcl Conc Of Acidmentioning

confidence: 99%

An Outline of Employing Metals and Alloys in Corrosive Settings with Ecologically Acceptable Corrosion Inhibitors

Baskar,

Annadurai,

Panneerselvam

et al. 2023

Surfaces

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Researchers have just discovered an alternative to synthetic corrosion inhibitors, which are hazardous and terrible for the ecosystem, to prevent rusting in the environment. A metal corrodes when it is subjected to corrosive media (acid, base, or saline) and they deteriorate, leading to failure. The most straightforward and affordable corrosion protection and prevention technique in acidic environments has been proven to be corrosion inhibitors. On industrial surfaces, pieces of machinery, or vessels, these inhibitors slow the rate of corrosion, preventing the monetary losses brought on by metallic corrosion. Recently, attention has been directed to developing ecologically appropriate corrosion retardation methods because inorganic and organic inhibitors are harmful and expensive. Recent studies have focused on green mild steel (MS) corrosion inhibitors that mimic industrial processes in acidic conditions. This presentation briefly covers the many types of corrosion, the corrosion process and the most recent studies on using natural plant extracts as corrosion inhibitors. Since they are safe and cost-effective, green corrosion inhibitors are a new trend in preventing corrosion. These inhibitors are produced from various plant parts, and inhibition efficiency (IE) also depends on them. To ascertain the IE of the corrosion inhibitor, some experiments, including computational studies (quantum calculations and MD simulations), electrochemical measurements (electrochemical impedance (EIS) and potentio-dynamic polarization), surface morphology atomic force microscopy (AFM), scanning electron microscopy (SEM)/energy-dispersive X-ray analysis (EDX) and UV–visible spectroscopy are carried out. It has been demonstrated that the IE is maximum for green corrosion inhibitors compared to synthetic inhibitors. This paper provides an overview of the properties, mechanism of corrosion inhibitors, nature of green corrosion inhibitors and their IE obtained by performing tests. This review article discussion shows that reinforcement with plant extract performs well in aggressive environments, which is evident from electrochemical studies and surface analysis when compared to reinforcement with inhibitors.

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“…The chemistry of plant species belonging to the genus Funtumia is not well documented when compared to that of the renowned Rauvolfia and Tabernaemontana genera (~76 and 110 species respectively) [15,16]. However, previous studies on Funtumia species report the isolation of various classes of secondary metabolites including alkaloids, sterols, acid J o u r n a l P r e -p r o o f derivative (ascorbic acid) and an ursane triterpene (methyl ursolate) with potent, antiplasmodial activities [11,[17][18][19].…”

Section: Leishmaniasis Is Among the Top Five Of Vector-bone Diseases ...mentioning

confidence: 99%

Antiplasmodial and antileishmanial inhibitory activity of triterpenes and steroidal alkaloid from the leaves of Funtumia elastica (Preuss) Stapf (Apocynaceae)

Ma'mag¹,

Zintchem

Théodora

et al. 2021

Fitoterapia

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

Cited by 15 publications

References 43 publications

Evaluation of Bitter Kola Leaf Extract as an Anticorrosion Additive for Mild Steel in 1.2 M H2SO4 Electrolyte

Evaluation of Bitter Kola Leaf Extract as an Anticorrosion Additive for Mild Steel in 1.2 M H2SO4 Electrolyte

An Outline of Employing Metals and Alloys in Corrosive Settings with Ecologically Acceptable Corrosion Inhibitors

Antiplasmodial and antileishmanial inhibitory activity of triterpenes and steroidal alkaloid from the leaves of Funtumia elastica (Preuss) Stapf (Apocynaceae)

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