Inhibition of copper corrosion in chloride solution by caffeine isolated from black tea

Gudić, Senka; Oguzie, Emeka E.; Radonić, Ani; Vrsalović, Ladislav; Smoljko, Ivana; Kliškić, Maja

doi:10.20450/mjcce.2014.441

Cited by 20 publications

(15 citation statements)

References 45 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: 54%

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: 54%

Alkaloids as green and environmental benign corrosion inhibitors: An overview

2019

Int. J. Corros. Scale Inhib.

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“…O melhor resultado foi identificado com o uso de 300 ppm do extrato, que possibilita uma taxa de corrosão de 1,01 mm.ano -1 , significando uma eficiência de inibição de 90,2%. Os percentuais de eficiência de inibição do extrato alcoólico do chá branco são comparáveis aos valores encontrados em trabalhos na literatura envolvendo o chá branco e os demais chás da Camellia sinensis [10,11,[15][16][17][18][19][20], assim como de outras plantas [6,7,[23][24][25][26][27][28][29][30][31]. Vale destacar que uma avaliação mais abrangente entre os resultados dessa pesquisa e os dados de outros trabalhos apresenta restrições, devendo ser feita dentro do limite de comparação de comportamentos e tendências entre propriedades, uma vez que cada chá da Camellia sinensis, ou de qualquer outra planta, apresenta em sua composição metabólitos diferentes provenientes da natureza da planta e das condições empregadas na extração.…”

Section: Resultsunclassified

“…Dentre esses compostos destacam-se os polifenóis, como os flavonoides, catequinas e taninos. Já o chá preto foi testado como inibidor de corrosão para o cobre, apresentando uma eficiência de inibição na faixa de 92% na presença de NaCl [19].…”

Section: Introductionunclassified

Avaliação do chá branco como potencial inibidor de corrosão

Oliveira

Cardoso

2019

Matéria (Rio J.)

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RESUMO O trabalho apresenta avaliação do extrato alcoólico do chá branco como potencial inibidor de corrosão para o aço carbono P110 na presença de ácido clorídrico 1 mol.L-1. Os inibidores de corrosão destacam-se na proteção de peças metálicas em ambientes ácidos, sendo que muitas das substâncias presentes na composição de inibidores comerciais apresentam caráter danoso ao meio ambiente. Por este motivo, extratos de plantas passaram a ser avaliados como potenciais inibidores de corrosão pela sua natureza não tóxica ao meio ambiente, além de seu caráter renovável, constituindo-se nos chamados inibidores verde de corrosão. O chá branco é proveniente da Camellia sinensis, sendo utilizadas folhas e galhos secos na preparação do extrato em etanol. Foram realizados ensaios de perda de massa para diferentes concentrações do extrato (100, 200 e 300 ppm), com a concentração de 300 ppm apresentando o melhor resultado, com uma eficiência de inibição de 90,2%. Ensaios de polarização e impedância eletroquímica foram realizados com redução nas correntes anódicas e catódicas, aumento na resistência a transferência de carga e redução na capacitância da dupla camada elétrica, indicando um processo de adsorção do extrato sobre as áreas ativas do metal. Os resultados apontam para o potencial uso de extrato alcoólico do chá branco como matéria ativa na formulação de inibidor de corrosão ambientalmente seguro.

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“…Gudić and co-workers [51] implemented Quantum chemical and molecular dynamics studies to evaluate adsorption of one caffeine molecule and polymeric structure of caffeine on copper surface and was well versed with the experimental results. Also, increase in number of caffeine molecules on the adsorptive site increases the binding energy.…”

Section: Figure 2 Some Widely Used Natural Products Exploited As Green Corrosion Inhibitorsmentioning

confidence: 99%

Green Corrosion Inhibitors for Coatings

Payal

Jain

2021

Sustainable Corrosion Inhibitors

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Corrosion is emerging as a potential hazard which abolishes metals and their structures and hence become an imperative menace. It is an omnipotent and omnipresent process which is present in every environment, i.e., air, soil, water. Green chemistry is one of the notable branches of chemistry that focuses on the protection of environment and human well–being in an economically viable approach allowing dodging of toxins and reducing hazards due to corrosion. Green chemistry exploited well–known strategy namely green inhibitors to prevent, control or impede the growth of corrosion. Green inhibitors are eco–friendly, cost–effective, renewable natural products which are favourable over toxic synthetic corrosion inhibitors. Extracts of natural products contain natural products containing alkaloids, carboxylic acids, nicotine, polyphenols, quinine, terpenes, and other functional groups possessing elements like C, N, O, S, etc., prompting adsorption via forming a thin layer (coating) on the metallic surface to shield the surface and encumber corrosion. In the field of economical loop, this approach develops various potential applications in manufacturing areas other than ‘Trash to treasure’. Even though a bunch of experiments have been performed and several research articles have been in print, however, the area of green inhibitors is still demanding more investigation on this open issue. More and more interest in the area extended the research, consequentially to a large variety of tried molecules. Nevertheless, the most accepted protocols are classical and, therefore, are incompetent to completely portray the probable worth of inhibitors. Hence all above stated features should be the objective of the contemporary research so that productive analysis to emphasize the weak areas of the green inhibitors field and tackle the prospect research in the field that still requires validation.

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Inhibition of copper corrosion in chloride solution by caffeine isolated from black tea

Cited by 20 publications

References 45 publications

Alkaloids as green and environmental benign corrosion inhibitors: An overview

Alkaloids as green and environmental benign corrosion inhibitors: An overview

Avaliação do chá branco como potencial inibidor de corrosão

Green Corrosion Inhibitors for Coatings

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