Evaluation of Thymus vulgaris plant extract as an eco-friendly corrosion inhibitor for stainless steel 304 in acidic solution by means of electrochemical impedance spectroscopy, electrochemical noise analysis and density functional theory

Ehsani, Ali; Mahjani, M.G.; Hosseini, Maryam; Safari, Reza; Moshrefi, Reza; Shiri, Hamid Mohammad

doi:10.1016/j.jcis.2016.11.048

Cited by 238 publications

(66 citation statements)

References 40 publications

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“…Heavy metals such as lead (Pb) which are produced from industry (painting, charcoal burning, and leaded gasoline) are known to be a threat to the marine environment [5]. A previous research has employed Thymus vulgaris as a corrosion inhibitor for stainless steel in acidic solution [6]. The findings show that the inhibitor efficiency increases as the concentration increase.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Concentration of Lawsonia inermis as a Corrosion Inhibitor for Aluminum Alloy in Seawater

Zulkifli

Ali

Yusof

et al. 2017

Advances in Physical Chemistry

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Lawsonia inermis also known as henna was studied as a corrosion inhibitor for aluminum alloy in seawater. The inhibitor has been characterized by optical study via Fourier transform infrared spectroscopy (FTIR). The FTIR proves the existence of hydroxyl and carbonyl functional groups in Lawsonia inermis. Aluminum alloy 5083 immersed in seawater in the absence and presence of Lawsonia inermis was tested using electrochemistry method, namely, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PP). EIS and PP measurements suggest that the addition of Lawsonia inermis has caused the adsorption of inhibitor on the aluminum surface. The adsorption behavior of the inhibitor follow Langmuir adsorption model where the value of free energy of adsorption, -ΔG, is less than 40 kJ/mol indicates that it is a physical adsorption. Finally, it was inferred that Lawsonia inermis has a real potential to act as a corrosion inhibitor for aluminum alloy in seawater.

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Section: Introductionmentioning

confidence: 99%

The Effect of Concentration of Lawsonia inermis as a Corrosion Inhibitor for Aluminum Alloy in Seawater

Zulkifli

Ali

Yusof

et al. 2017

Advances in Physical Chemistry

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“…Among all samples, the substrate demonstrates the highest Q d value, indicating thatthe passive film formed on it is the most unstable and easy to be corroded.n signifiesthe deviation degree ofadouble layer capacitor from an ideal capacitor, which mainly depends on the surface state (roughness, inhibitor adsorption, etc) of the samples [44]. The surfaces of the passive film adhering to all samples' surfaces are similar due to their similar n values.R ct refers tothe chargetransfer resistance, which is regarded asanessential parameters evaluating the resistance of reactions occurring on the samples surface [45,46]. It is clear that the R ct value of Coating III (1.20E6 Ω·cm 2 ) is evidently higher than those obtained at the other samples (9.80E5 Ω·cm 2 for Coating II, 8.56E5 Ω·cm 2 for Coating I, and 9.52E4 Ω·cm 2 for the substrate).…”

Section: Xrd Analysesmentioning

confidence: 99%

Investigation into corrosion and wear behaviors of laser-clad coatings on Ti6Al4V

Zhang

Jiang

et al. 2020

Mater. Res. Express

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TiAlCoCr x FeNihigh-entropy alloys (HEAs) coatings were fabricated on the surface of Ti6Al4V by laser cladding. Their microstructural evolution with the increase in x value (x=0, x=1.0, x=2.0) was investigated in detail. Besides that, the investigation into the effects of the Cr content on their corrosion behaviors and mechanical properties (in terms of hardness and wear resistance) was also carried out comprehensively. The results indicated that two kinds of phases (a solid solution with thehexagonal close-packed (HCP) structureand Ti 2 Ni) were synthesized in the coatings, and the HCP content was gradually increased with the increase in x accompanied with the decrease in Ti 2 Ni content. A HEA coating only composed of single HCP was successfully prepared when x reached 2.0. The electrochemical and immersion tests all confirmed that the coating with x=2.0demonstrated the most excellent corrosion resistance in a0.1 mol·L −1 HCl solution from different aspects including corrosion tendency and corrosion rate without the applied potential, the formation difficult/stability of the passive film and the dissolution rate in the passive state, and corrosion surface morphology. The averagemicrohardness values of the coatings weregraduallyincreasedfrom 656HV 0.2 to 800 HV 0.2 with increasing xfrom 0 to 2.0, which wereabout double that of the substrate (350 HV 0.2 ). Wear resistance of the coatings also exhibited the upward tendency with increasing the x values (0.562 mm 3 at x=2.0, 0.640 mm 3 at x=1.0, 0.641 mm 3 at x=0 and 1.419 mm 3 for the substrate). More Cr addition into the cladding material will contribute to the formation of a HEA coating composed of single HCPwith excellent corrosion and wear resistance.

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“…Ecorr values shift to more positive regions on addition of SEGS from all the solvents signifying that the SEGS has more effects on anodic half reaction by suppressing the oxidation or corrosion of iron. 21 In the literature, when the shift in Ecorr values is up to -85 mV, the inhibitor is classified as anodic or cathodic type inhibitor. 22 The shifts in Ecorr values obtained is not up to -85 mV indicating that SEGS acts as a mixed type inhibitor with anodic predominance.…”

Section: Rctmentioning

confidence: 99%

Solvents Effect on Thermal Stability and Electrochemical Behaviour of Griffonia Simplicifolia Extracts as Steel Corrosion Inhibitor in Acidic Environment

Ituen¹,

Akaranta²,

James³

2017

ECB

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Different solvents were used to extract Griffonia simplicifolia and tested corrosion inhibitors for as X80 steel in 1 M HCl solution. The corrosion tests were conducted by thermo-gravimetric analyses (TGA), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) while the surface morphologies were checked by scanning electron microscopy (SEM). The essence was to investigate the effects of the solvents on the yield, phytochemical profile, corrosion inhibition properties and thermal stability of the extracts. The highest yields of 63.24 g kg -1 and 51.63 g kg -1 were obtained with seeds (SEGS) and leaves (LEGS) extracts respectively in ethanol-water (1:1) system. Acetone extract showed presence of all the tested phytochemicals namely alkaloids, tannins, saponins, glycosides, steroids and terpenoids. The highest inhibition efficiencies of 95.86 % (SEGS) and 82.14 % (LEGS) were obtained with acetone extracts. Acetone extract was also most thermally stable being 66.4 % (SEGS) and 50.05 % (LEGS) efficient at 90 C, followed by ethanol extract while methanol extract was least stable and least efficient. Inhibitors act as mixed type and their addition increased charge transfer resistance and decreased corrosion current density with respect to the free acid solution. Micrographs of the steel surface in some systems show evidence of slight surface protection by the inhibitors. It has been inferred from this study that both acetone and ethanol are better solvents for extraction of Griffonia simplicifolia based corrosion inhibitors.

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Evaluation of Thymus vulgaris plant extract as an eco-friendly corrosion inhibitor for stainless steel 304 in acidic solution by means of electrochemical impedance spectroscopy, electrochemical noise analysis and density functional theory

Cited by 238 publications

References 40 publications

The Effect of Concentration of Lawsonia inermis as a Corrosion Inhibitor for Aluminum Alloy in Seawater

The Effect of Concentration of Lawsonia inermis as a Corrosion Inhibitor for Aluminum Alloy in Seawater

Investigation into corrosion and wear behaviors of laser-clad coatings on Ti6Al4V

Solvents Effect on Thermal Stability and Electrochemical Behaviour of Griffonia Simplicifolia Extracts as Steel Corrosion Inhibitor in Acidic Environment

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