Effect of <i>Helichrysum italicum</i> on the Electrochemical Corrosion Behaviour of Iron in Simulated Acid Rain Solution

Pilić, Zora; Martinović, Ivana; Pavlinović, Marija; Zlatić, Gloria

doi:10.5562/cca3451

Cited by 3 publications

(10 citation statements)

References 27 publications

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“…The values of ΔG above −40 kJ mol -1 are associated to chemisorptions by charge sharing or transfer from the inhibitor molecules to the metal surface to form a coordinate type of bond. [4,5,26] The calculated negative values of ΔG confirm the spontaneous adsorption of AV extract on the Al surface by physisorption.…”

Section: Adsorption Mechanismsupporting

confidence: 57%

“…The first time constant, at medium frequencies, is the result of the fast charge transfer process during the Al dissolution: the CPE1 with power n close to 1.0 describes a capacitor with Q1 equal to the double-layer capacitance, Cdl and R1 represents the charge transfer resistance. [4,5] The second time constant is represented by CPE2 with power n close to 0.5 that represents Warburg impedance which describes the diffusion processes through the film (diffusion of oxygen or metal ions). [19,20] EEC used to describe impedance spectra of Al electrode in 3% NaCl with presence of 1.0 g L -1…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

“…Also, increase in charge transfer resistance (from 15 to 75 kΩ cm 2 ) as the AV extract concentration increases shows significant surface coverage. [21,22] The surface coverage can be calculated from charge transfer resistance values according to the following equation: [5,23]…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

“…Impedance parameters, surface coverage and inhibition efficiency for Al electrode in 3 % NaCl, with and without presence of AV extract. The equilibrium adsorption constant is related to the free energy of adsorption ΔG°: [5] 1 1…”

Section: Adsorption Mechanismmentioning

confidence: 99%

“…Natural products, such as aromatic and medicinal plants, have been used as naturally occurring corrosion inhibitors that are environment friendly, easily biodegradable, inexpensive and readily available. [1,[3][4][5][6][7][8] Protection efficiency of plant extract is attributed mainly to the presence of active compounds, such as phenols, flavonoids, tannins, terpenes, etc., which are known for their antimicrobial, antioxidant and anticorrosion activities. These compounds adsorb on active metal surfaces and form a protective layer that reduces the corrosion attack.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Inhibition of Aluminium by Alchemilla vulgaris L. Extract in 3 % NaCl Solution

et al. 2021

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Extract of Alchemilla vulgaris L. was investigated as eco-friendly corrosion inhibitor for aluminium in 3 % NaCl using electrochemical techniques. According to the results, inhibition efficiency increases with the increase concentration of extract and the highest efficiency (~80 %) is recorded for the maximal concentration of extract (1.0 g L -1 ). The inhibition activity of extract occurs by the spontaneous physisorption (ΔG ≈ -16 kJ mol -1 ) on active sites of aluminium surface that follows Freundlich isotherm. Polarization curves showed that Alchemilla vulgaris L.extract act s a mixed-type inhibitor. The effect of temperature on the aluminium corrosion and inhibition action of extract was studied and the result showed that the corrosion rate increased and the inhibitor efficiency decreased with increase of temperature. The calculated values of the activation energy confirmed presence of inhibitive Alchemilla vulgaris L. extract on aluminium surface.

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Section: Adsorption Mechanismsupporting

confidence: 57%

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Section: Adsorption Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion Inhibition of Aluminium by Alchemilla vulgaris L. Extract in 3 % NaCl Solution

et al. 2021

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Antioxidant Capacity of Herzegovinian Wildflowers Evaluated by UV–VIS and Cyclic Voltammetry Analysis

et al. 2022

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Considering the vast cultural and traditional heritage of the use of aromatic herbs and wildflowers for the treatment of light medical conditions in the Balkans, a comparison of the antioxidant capacity of wildflowers extracts from Herzegovina was studied using both cyclic voltammetry and spectrophotometry. The cyclic voltammograms taken in the potential range between 0 V and 800 mV and scan rate of 100 mV s−1 were used for the quantification of the electrochemical properties of polyphenols present in four aqueous plant extracts. Antioxidant capacity expressed as mmoL of gallic acid equivalents per gram of dried weight of the sample (mmoL GAE g−1 dw) was deduced from the area below the major anodic peaks (Q400 pH 6.0, Q500 pH 4.7, Q600 pH 3.6). The results of electrochemical measurements suggest that the major contributors of antioxidant properties of examined plants are polyphenolic compounds that contain ortho-dihydroxy-phenol or gallate groups. Using Ferric reducing-antioxidant power (FRAP) and 2,2′-azino-bis spectrophotometric methods (3-ethylbenzthiazoline-6-sulphonic acid) radical cation-scavenging activity (ABTS) additionally determined antioxidant capacity. The FRAP results ranged from 2.9702–9.9418 mmoL Fe/g dw, while the results for ABTS assays expressed as Trolox equivalents (TE) ranged from 14.1842–42.6217 mmoL TE/g dw. The Folin–Ciocalteu procedure was applied to determine the total phenolics content (TP). The TP content expressed as Gallic acid equivalents (GAE) ranged from 6.0343–9.472 mmoL GAE/g dw. The measurements of total flavonoid (TF) and total condensed tannin (TT) contents were also performed to obtain a broader polyphenolic profile of tested plant materials. Origanum vulgare L. scored the highest on each test, with the exception of TT content, followed by the Mentha × piperita L., Artemisia annua L., and Artemisia absinthium L., respectively. The highest TT content, expressed as mg of (−)catechin equivalents per gram of dried weight of sample (mg CE/g dw), was achieved with A. absinthium extract (119.230 mg CE/g dw) followed by O. vulgare (90.384 mg CE/g dw), A. annua (86.538 mg CE/g dw) and M. piperita (69.231 mg CE/g dw), respectively. In addition, a very good correlation between electrochemical and spectroscopic methods was achieved.

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Green Inhibition of Corrosion of Aluminium Alloy 5083 by Artemisia annua L. Extract in Artificial Seawater

et al. 2023

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Plant extracts are increasingly being examined in the corrosion inhibition of metal and alloys in various environments due to their potent antioxidant properties. The use of Artemisia annua L. aqueous extract (AAE) as an aluminium alloy 5083 (ALA) corrosion inhibitor in artificial seawater (ASW) was investigated using electrochemical tests and spectroscopy tools, while the active biocompounds found in AAE were analyzed using high-performance liquid chromatography (HPLC). Electrochemical results showed that AAE acts as an anodic inhibitor through the physisorption (ΔG ≈ –16.33 kJ mol−1) of extract molecules on the ALA surface, thus reducing the active sites for the dissolution of the alloy in ASW. Fourier-transform infrared spectra confirmed that phenolic acids found in AAE formed the surface layer that protects ALA against the corrosive marine environment, while HPLC analysis confirmed that the main phytoconstituents of AAE were chlorogenic acid and caffeic acid. The inhibition action of phenolic acids and their derivatives found in the AAE was based on the physisorption of caffeic acid on the ALA surface, which improved physicochemical properties of the barrier film and/or conversion of Al3+ to elemental aluminium by phenolic acids as reducens, which slowed down the diffusion rate of Al3+ to or from the ALA surfaces. The protective effect of the surface layer formed in the presence of AAE against ASW was also confirmed by inductively coupled plasma–optical emission spectrometry (ICP-OES) whereby the measured concentration of Al ions after 1h of immersion of ALA in the pure ASW was 15.30 μg L−1 cm−2, while after the addition of 1 g L−1 AAE, the concentration was 3.09 μg L−1 cm−2.

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Effect of Helichrysum italicum on the Electrochemical Corrosion Behaviour of Iron in Simulated Acid Rain Solution

Cited by 3 publications

References 27 publications

Corrosion Inhibition of Aluminium by Alchemilla vulgaris L. Extract in 3 % NaCl Solution

Corrosion Inhibition of Aluminium by Alchemilla vulgaris L. Extract in 3 % NaCl Solution

Antioxidant Capacity of Herzegovinian Wildflowers Evaluated by UV–VIS and Cyclic Voltammetry Analysis

Green Inhibition of Corrosion of Aluminium Alloy 5083 by Artemisia annua L. Extract in Artificial Seawater

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