Roasted Coffee Extracts as Corrosion Inhibitors for Mild Steel in HCL Solution

Souza, Elaine Cesar do Carmo Assumpção de; Ripper, Beatriz; Perrone, Daniel; D’Elia, Eliane

doi:10.1590/1980-5373-mr-2015-0740

Cited by 34 publications

(36 citation statements)

References 15 publications

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“…SEM, EDS and flurescence studies suggested the adsorption of the caffeine over the metallic surface. The inhibition effect of caffeine based compounds on copper [110][111][112][113], nickel [114], mild and carbon steel [115][116][117][118] and aluminum [119] corrosion in other electrolyte systems have also been reported in other studies. Besides the above reports, Mahmood reported the corrosion inhibition effect of theobromine, a purine based alkaloid on the corrosion on mild steel in acidic solution of HCl [119].…”

Section: Purine Based Alkaloids As Corrosion Inhibitorssupporting

confidence: 52%

Alkaloids as green and environmental benign corrosion inhibitors: An overview

2019

Int. J. Corros. Scale Inhib.

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Alkaloids are naturally occurring nitrogen containing organic bases that possess diverse and significant physiological effects on animals and humans. They are mostly derived from the plants. Because of their natural and biological origin, they (alkaloids) are considered as environmental benign alternatives to be used as corrosion inhibitors at the place of traditional and toxic synthetic corrosion inhibitors. Numerous alkaloids have been employed as effective corrosion inhibitors for metals and alloys in different electrolytic media. It has been established that alkaloid molecules are associated with extensive conjugation in the form of non-bonding and π-elections through which they can interact strongly and inhibit corrosion efficiently. Present review article features the collection of reports published on the topic alkaloids as corrosion inhibitors. In this review article, we also described the corrosion and its adverse effect, mechanism of corrosion and corrosion inhibition by organic corrosion inhibitors (including alkaloids) and factors affecting the inhibition property of corrosion inhibitors. Literature study suggests that most of the alkaloids are soluble in the polar electrolytic media and thereby behave as good corrosion inhibitors. Present review article describes the inhibition effect of several classes of alkaloids such as pyridine, purine and indole derivatives that have been used previously. Chemical structures alkaloids and their mode of adsorption and interactions with the metallic surface, nature of metal and electrolyte and related salient features have also been tabulated in the review.

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Section: Purine Based Alkaloids As Corrosion Inhibitorssupporting

confidence: 52%

Alkaloids as green and environmental benign corrosion inhibitors: An overview

2019

Int. J. Corros. Scale Inhib.

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“…These results show that the presence of the gorse extract changes the electrical doublelayer structure, intending that the inhibitory molecules act by adsorption at the metal/solution interface. The adsorption of an organic adsorbate between the metal/solution interface can be considered as a replacement adsorption process between the organic molecules in the aqueous solution Org (soln) and the water molecules on the metal surface H 2 O (ads) (12,31):…”

Section: Electrochemical Results and Discussionmentioning

confidence: 99%

“…From the electrochemical impedance data, it was possible to determine the degree of coverage of the metal surface (θ) as a function of inhibitor concentration. The experimental results were adjusted to different adsorption isotherms (Langmuir, Temkin, Flory-Huggins and El-Awady according to the following equations (12,31,38,39):…”

Section: Electrochemical Results and Discussionmentioning

confidence: 99%

“…Langmuir's theory admits that adsorption occurs at a specific and homogeneous site and each inhibitory molecule holds only one site (31). The Temkin isotherm assumes that the heat of adsorption of all the molecules covering the adsorbent decreases linearly as a function of the coating due to the interactions between the adsorbed molecules (a > 0, attraction, <0, repulsion) (12,31).…”

Section: Electrochemical Results and Discussionmentioning

confidence: 99%

“…x greater than one unit indicates that more than one molecule of H 2 O (ads) was substituted by an organic molecule, i.e. x is the number of water molecules replaced by an inhibitory molecule (31).…”

Section: Electrochemical Results and Discussionmentioning

confidence: 99%

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A study of the gorse aqueous extract as a green corrosion inhibitor for mild steel in HCl aqueous solution

Trindade

Santos

Cordeiro

et al. 2017

Green Chemistry Letters and Reviews

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The behavior of the gorse extract has been investigated as a new corrosion inhibitor by weight-loss measurements, potentiodynamic polarization curves, electrochemical impedance spectroscopy and scanning electron microscopy. Weight-loss measurements showed an increase in inhibition efficiency (IE) with the immersion time and the concentration of the extract. At 800 mg L −1 , the extract IE ranged from 72.5% to 93.8% for 2 and 48 h, respectively. The E a decreased slightly with the addition of the extract, characterizing the chemical adsorption by the molecules present in the extract on the surface. The measurements of electrochemical impedance spectroscopy showed an increase in R ct and a decrease in C dl , reaching 96.6% of IE at 1600 mg L −1. The polarization curves indicated that the gorse extract served as an adsorption inhibitor, reducing both the anodic and cathodic current density. The high-molecular-weight fraction isolated from the gorse extract also showed high inhibition efficiencies.

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