Monitoring corrosion and corrosion control of iron in HCl by non-ionic surfactants of the TRITON-X series – Part II. Temperature effect, activation energies and thermodynamics of adsorption

Amin, Mohammed A.; Ahmed, M. A.; Arida, Hassan; Arslan, Taner; Saraçoğlu, Murat; Kandemi̇rlı, Fatma

doi:10.1016/j.corsci.2010.09.019

Cited by 136 publications

(55 citation statements)

References 36 publications

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“…The additive molecules are adsorbed on the most active adsorption sites (having the lowest energy) and the dissolution process takes place predominantly in the active sites of higher energy. In the second case (E a, additives < E a, free acid, which observed in Vitamin C, the values of A in the presence of Vitamin C lower than in 8 M H 3 PO 4, that is, a smaller number of the more active sites remain uncovered which take part in the dissolution process (Amin et al, 2011). This phenomenon is normally observed when the adsorbed molecules shield several sites on the electrode surface.…”

Section: Activated Parameters For the Dissolution Processmentioning

confidence: 94%

A study of the morphology and optical properties of electro polished steel in the presence of Vitamin-C

Abouzeid¹

2015

Afr. J. Pure Appl. Chem.

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The studies of steel electrochemical polishing Electropolishing (EP) in orthophoshoric acid were performed by potentiodynamic polarization. Electropolishing was conducted in solution containing Vitamin C. Addition of Vitamin C to electropolishing solution results in a lower limiting current. Vitamin C concentration influence on electropolishing process and surface texture (AFM, SEM) and UV-VIS-NIR Spectroscopy was established. The results show that by increasing Vitamin C concentration from 2 × 10 -5 to 5 × 10 -5 M, roughness and reflectance of steel specimens decrease/increase respectively. The opposite trend is seen when the concentration increases to 10 × 10 -5 M. The roughness of steel specimen before electropolishing is 236.7 nm and it will decrease to 140 nm by electropolishing in the presence of 5 × 10 -5 M Vitamin C. A similar trend is also seen in reflection. The SEM study confirms that low and moderate concentration of Vitamin C was effective to enhance levelling and brightness more than higher concentrations.

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Section: Activated Parameters For the Dissolution Processmentioning

confidence: 94%

A study of the morphology and optical properties of electro polished steel in the presence of Vitamin-C

Abouzeid¹

2015

Afr. J. Pure Appl. Chem.

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“…Also the increase in temperature reduces solution viscosity with a consequent increase in Fe 2+ diffusivity which leads to increase in the dissolution rate. 24 Also decrease the IE% is due to desorption of extract molecules from the steel surface by increasing temperature. The IE% can be calculated from the I L values obtained from the polarization curves by using the formula,…”

Section: Effect Of Temperaturementioning

confidence: 99%

Physicochemical Study on the Effectiveness of Eco-Friendly Anti-Corrosion Agent on the Corrosion of Steel in H<sub>3</sub>PO<sub>4</sub> Solution

2015

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The inhibitory effect of extract of Hibiscus Sabdariffa on corrosion of steel in aqueous 8 M H 3 PO 4 was investigated by potentiodynamic polarization technique. The inhibition efficiency of Hibiscus extract on corrosion of steel in aqueous 8 M H 3 PO 4 solution increases on increasing in concentration of the extract and decreases with a rise in temperature. Potentiodynamic polarization measurement indicates that Hibiscus acts as a corrosion inhibitor. Theoretical fitting of the different isotherms were tested to clarify the nature of adsorption. The increase in activation energy of corrosion process in the presence of the extract indicates that the extract retards the rate of corrosion of steel in 8 M H 3 PO 4 solution. The structure and morphology of the extract were characterized by Fourier transform infrared spectroscopy (FTIR). Scanning electron microscopy (SEM) study confirmed the adsorption of inhibitor molecules on steel surface.

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“…), de acordo com Amin et al (2011). Estas avaliações são realizadas através de metodologias gravimétricas e potenciostáticas (XOMETL et al, 2006 ;DESIMONE et al, 2011).…”

Section: Corrosão: Análise De Perda De Massa Em Aço Carbono Aisi 1020unclassified

“…Há diversos trabalhos que descrevem a importante influência que a temperatura exerce na taxa de corrosão do aço-carbono em meio ácido (AMIN et al, 2011) Desta avaliação pode-se concluir que existem dois grupos com diferenças significativas:…”

Section: Corrosão: Análise De Perda De Massa Em Aço Carbono Aisi 1020unclassified

“…Sabe-se que a temperatura aumenta significativamente a taxa de corrosão em meio ácido através da diminuição do sobrepotencial de redução dos íons H + em gás hidrogênio (AMIN et al, 2011). Além disso, quando a eficiência dos inibidores é afetada significativamente pela temperatura, há indícios de que o mecanismo de proteção à corrosão ocorra por fisissorção -atração eletrostática entre o inibidor de corrosão e a superfície metálica (AMIN et al, 2011). Para comprovar este indício é preciso avaliar se os inibidores de corrosão estudados atuam por este mecanismo.…”

Section: Corrosão: Polarização Potenciodinâmicaunclassified

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Síntese enzimática e caracterização de alcanolamidas a partir de aminoálcoois e posterior avaliação de sua aplicação como inibidor de corrosão de aço carbono AISI 1020 em fluidos de corte semissintéticos

Luiz¹

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Dedico este trabalho à minha família e todos aqueles que acreditaram na minha capacidade e me ajudaram a realizar este sonho.Muito Obrigado! AGRADECIMENTOSÀ minha família, namorada e amigos, pelo apoio e paciência durante este período difícil, cheio de obstáculos e desafios.À Bruna "Okuki", por todo carinho, compreensão, conselhos, broncas e por me apoiar em todos os momentos, principalmente naqueles que quase me fizeram desistir do meu sonho. After checking the thermal stability of these fluids, the corrosion inhibition efficiency was measured by staining technique of cast iron. Fluids containing alkanolamides performed better corrosion inhibition, however, was not possible to measure quantitatively the differences observed using this technique. Thus, the compounds were subjected to weight loss and potentiodynamic polarization tests in hydrochloric acid, besides the atomic microscopy to evaluate the effect of the inhibitors on the metal surface. Through these studies it was possible to demonstrate that RDIPA and RAEPD products were more efficient at inhibiting corrosion.The mechanism of inhibition of these compounds, as determined by Langmuir isotherms, is by physisorption. After checking the anticorrosive properties of the synthesized compounds, the following properties were analyzed from the formulated fluids: viscosity, foaming, contact angle, Reichert friction, alkalinity and microbiological contamination. It was observed an increase in viscosity and foaming on the concentrated fluids. However, it was found that there is no significant impact of these properties during the application of these fluids.Alkanolamides enabled an increase in lubricity and alkalinity of the formulated fluids.Additionally they reduced the corrosion rate and the susceptibility of fluids to microbiological contamination, and would make easier the treatment of the waste generated in cutting process due to their higher biodegradability.

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Monitoring corrosion and corrosion control of iron in HCl by non-ionic surfactants of the TRITON-X series – Part II. Temperature effect, activation energies and thermodynamics of adsorption

Cited by 136 publications

References 36 publications

A study of the morphology and optical properties of electro polished steel in the presence of Vitamin-C

A study of the morphology and optical properties of electro polished steel in the presence of Vitamin-C

Physicochemical Study on the Effectiveness of Eco-Friendly Anti-Corrosion Agent on the Corrosion of Steel in H<sub>3</sub>PO<sub>4</sub> Solution

Síntese enzimática e caracterização de alcanolamidas a partir de aminoálcoois e posterior avaliação de sua aplicação como inibidor de corrosão de aço carbono AISI 1020 em fluidos de corte semissintéticos

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