Application of Inhibitors for Acid Media: Report prepared for the European Federation of Corrosion Working Party on Inhibitors

Schmitt, Guenter

doi:10.1179/000705984798273100

Cited by 464 publications

(56 citation statements)

References 16 publications

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“…As seen in the results presented in the present work, both Al and Ni have high free energies of adsorption for the inhibitors studied in this work, implying that organic chemical inhibitors may be extremely practical in these systems. However, the general review of inhibiting treatments in acidic environments by G. Schmitt covers a broad range of metals and compounds [68], and it was mentioned in that review that inhibitors that work well in iron and copper systems are less effective for Al and Ni. Unlike iron, Al and Ni both have highly corrosion resistant oxide films, and suffer more from localized corrosion and stress-corrosion cracking, rather than uniform corrosion [69][70][71].…”

Section: Discussionmentioning

confidence: 99%

Interaction of Model Inhibitor Compounds with Minimalist Cluster Representations of Hydroxyl Terminated Metal Oxide Surfaces

Taylor¹,

Kurapati

Mondal³

2018

Metals

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Abstract:The computational modeling of corrosion inhibitors at the level of molecular interactions has been pursued for decades, and recent developments are allowing increasingly realistic models to be developed for inhibitor-inhibitor, inhibitor-solvent and inhibitor-metal interactions. At the same time, there remains a need for simplistic models to be used for the purpose of screening molecules for proposed inhibitor performance. Herein, we apply a reductionist model for metal surfaces consisting of a metal cation with hydroxide ligands and use quantum chemical modeling to approximate the free energy of adsorption for several imidazoline class candidate corrosion inhibitors. The approximation is made using the binding energy and the partition coefficient. As in some previous work, we consider different methods for incorporating solvent and reference systems for the partition coefficient. We compare the findings from this short study with some previous theoretical work on similar systems. The binding energies for the inhibitors to the metal hydroxide clusters are found to be intermediate to the binding energies calculated in other work for bare metal vs. metal oxide surfaces. The method is applied to copper, iron, aluminum and nickel metal systems.

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Section: Discussionmentioning

confidence: 99%

Interaction of Model Inhibitor Compounds with Minimalist Cluster Representations of Hydroxyl Terminated Metal Oxide Surfaces

Taylor¹,

Kurapati

Mondal³

2018

Metals

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“…As a corrosion prevention and protection method, application of inhibitor is very popular. A number of heterocyclic compounds with N, S, and O as hetero atoms are proved to be effective corrosion inhibitors [1,2], and the screening of synthetic heterocyclic compounds is still being continued. Though many synthetic compounds showed good anticorrosive activity, most of them are highly toxic to both human beings and environment.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of Mild Steel Corrosion in Acid by Green Inhibitors: Yeast, Pepper, Garlic, and Coffee

Paul

Kar

2012

ISRN Corrosion

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Synthesized organic chemicals, used as inhibitors in mitigating the corrosion of huge quantities of steel articles, pose a major threat to the global environmental problems and health hazards. Naturally occurring products which had been used for natural medication purposes, since the human civilization, are found to inhibit corrosion of steel. Electrochemical studies of the effects of black pepper, garlic, yeast, and coffee on acid corrosion of steel have shown that the corrosion current decreases by manyfold with increase in concentration of the inhibitors. These green inhibitors have been found to get adsorbed maximum up to 70-90%. The polarizing effect is more on cathodic reactions than on anodic reactions, acting as cathodic inhibitor, while a few behaves as anodic to mixed inhibitor. Mechanisms of adsorption are investigated by Frumkin, Temkin, and Langmuir isotherms. The free energy of adsorption is found to be between −15 and −40 kJ/m for most inhibitors, indicating the phenomena of physical adsorption.

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“…Geralmente, o uso de tensoativos como inibidores de corrosão se encontra bem documentado 1,5,6,8,[15][16][17][18][19][20][21] . No entanto, tensoativos em sistemas microemulsionados (SME) como agentes inibidores de corrosão, bem como substâncias orgânicas solubilizadas em SME, são alvo recente de interesse do Laboratório de Tecnologia de Tensoativos da UFRN (LTT) 22 , não tendo sido evidenciado na literatura nenhum outro trabalho envolvendo SME como inibidores de corrosão.…”

Section: Introductionunclassified

Estudo comparativo da eficiência da difenilcarbazida e do óleo de coco saponificado microemulsionados na inibição da corrosão de aço carbono

Rossi¹,

Scatena²,

Maciel³

et al. 2007

Quím. Nova

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. The effectiveness of microemulsions (ME) of saponified coconut oil (OCS-ME) and diphenylcarbazide (DC-ME) on a carbon steel corrosion inhibition process was evaluated using an electrochemical method of polarization resistance. The ME was prepared with OCS, butanol, kerosene and saline solutions. OCS-ME and DC-ME showed highest inhibitions effects (77% and 92%, respectively) at lower concentrations (0.5% and 0.48 -0.50%, respectively). The surfactant OCS (in H 2 O) showed lower efficiency (63% at 0.20 -0.25% concentration). The greatest inhibitory effect of DC-ME could be correlated with the chemical structure and the rich O/W ME system, which are very important for adsorption phenomena in interfacial ME systems.Keywords: diphenylcarbazide; saponified coconut oil; microemulsion. INTRODUÇÃOA importância do emprego de materiais metálicos em equipamentos utilizados no setor industrial (têxtil, de alimentos, de petró-leo, dentre outros) que operam em altas temperaturas, justifica a necessidade da otimização de estudos sobre o processo de corrosão, objetivando a minimização de perdas por deterioração de metais. De maneira geral, o estudo de processos corrosivos tem como objetivo principal conhecer e caracterizar os diversos meios agressivos que são responsáveis pelas reações químicas e eletroquímicas causadas em materiais de elevada importância industrial para, em uma etapa subseqüente, reduzir os efeitos com agentes antioxidantes, denominados de inibidores de corrosão.Os processos reacionais que geram a corrosão são geralmente espontâneos e transformam, constantemente, as características fí-sicas e químicas de materiais metálicos e não-metálicos, interferindo, conseqüentemente, em sua estrutura, durabilidade e desempenho. O conhecimento exato dos princípios básicos desses processos é imprescindível para que se estabeleçam considerações qualitativas e quantitativas sobre a cinética de corrosão 1 . Dentre as muitas maneiras de definição de corrosão, pode-se dizer que "a corrosão é a deterioração espontânea de um material, metálico ou não metálico, por ação química ou eletroquímica do meio ambiente, aliada, ou não, a esforços mecânicos" 1,2 . Um dos principais meios causadores de corrosão em instalações industriais (originárias de ferro ou aço) são as salmouras. Um exemplo significativo pode ser dado na indústria de óleos, onde a corrosão em oleodutos é desencadeada por elevados teores de salinidade, necessários para a produção de óleos 3 . Muitas pesquisas têm sido desenvolvidas no sentido de reduzir os efeitos da corrosão. Dentre os processos e métodos mais utilizados destacam-se: o aumento da resistência dos materiais por implantação de sistemas de proteção catódica e anódica, o uso de revestimentos, de agentes inibidores e antioxidantes 1,4 . O uso de inibidores de corrosão caracteriza-se em um dos métodos de grande interesse, já que funcionam como pelícu-las protetoras (sobre áreas anódicas e catódicas) que interferem na ação eletroquímica 1 . Como inibidores de corrosão, moléculas orgâ-nicas fortemente polares s...

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Application of Inhibitors for Acid Media: Report prepared for the European Federation of Corrosion Working Party on Inhibitors

Cited by 464 publications

References 16 publications

Interaction of Model Inhibitor Compounds with Minimalist Cluster Representations of Hydroxyl Terminated Metal Oxide Surfaces

Interaction of Model Inhibitor Compounds with Minimalist Cluster Representations of Hydroxyl Terminated Metal Oxide Surfaces

Mitigation of Mild Steel Corrosion in Acid by Green Inhibitors: Yeast, Pepper, Garlic, and Coffee

Estudo comparativo da eficiência da difenilcarbazida e do óleo de coco saponificado microemulsionados na inibição da corrosão de aço carbono

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