Effectiveness of <i>Croton cajucara</i> Benth on corrosion inhibition of carbon steel in saline medium

In this research, the effects of chitosan on the corrosion behavior of mild steel in 0.1 M hydrochloric acid was investigated by different approaches. According to weight loss measurements, increasing the concentration of chitosan from 0.3 to 1.8 mM, significantly reduced the corrosion rate of mild steel, for example, from 95.5 ± 5 to 7.5 ± 5 mpy at 298 K. The thermodynamic calculations indicate an increase in the corrosion activation energy and the enthalpy of activation when 1.8 mM chitosan was added to the aggressive solution. The electrochemical polarization technique revealed a decrease in corrosion current density which is compatible with the observed increase in the charge transfer resistance measured by electrochemical impedance spectroscopy. The EDS spectra confirmed the adsorption of chitosan on mild steel. Analyzing the surface topography of the coupons by atomic force microscopy showed a remarkable decrease in the corrosion rate of the specimens in the presence of chitosan.

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“…The negative sign of the obtained

normalΔ G_{a d s}^{°}

implies the spontaneous adsorption of the chitosan molecules and the stability of them on the surface of the tested coupons …”

Section: Resultsmentioning

confidence: 99%

Chitosan as a green inhibitor for mild steel corrosion: Thermodynamic and electrochemical evaluations

Rabizadeh

Asl

2018

Materials & Corrosion

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“…Many additives have been used to improve the inhibition efficiency of plant extracts. For example Zn 2+ , methylene dichloride, n-butanolic extract [46][47][48][49][50][51], KI [22,52,53], KCl, KBr [54][55][56][57][58], formaldehyde, diethylamine [59], ethyl acetate [60], and dimethyl sulfoxide [61].…”

Section: Organic Green Inhibitorsmentioning

confidence: 99%

Green Methods for Corrosion Control

Emran¹,

Ali²,

lehaibi³

2018

Corrosion Inhibitors, Principles and Recent Applications

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Corrosion of metals is a serious environmental problem. Most of the corrosion inhibitors are synthetic chemicals that are hazardous to environments and expensive. Today, there has been an increasing search for green corrosion inhibitors, due to the toxicity of some inhibitors. Green corrosion inhibitors are biodegradable and free of heavy metals or other toxic compounds. There is an intensive effort underway to develop new plant origin corrosion inhibitors for metal subjected to various environmental conditions. Salts of rare earth elements can be also used as inorganic alternative nontoxic corrosion inhibitors. Sol-gel coatings can be recommended as green protective films for metal corrosion. The origin of sol-gel process, its advantages and limitations, and the type of coating method are presented in this chapter, as well as a brief summary of recent literature concerning the use of hybrid inorganic-organic sol-gel and nanostructured sol-gel protective coatings for metal corrosion in different media.

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“…O extrato hidroalcoólico das cascas do caule dessa planta mostrou ser uma fonte rica em diterpenos do tipo clerodano, 29 tendo sido comprovada sua eficácia antimicrobiana (Escherichia coli, Bacillus cereus e Enterococcus faecium) 30,31 bem como ação anticorrosiva relevante (94 %) em aço carbono AISI 1020, em meio salino, quando veiculado em uma microemulsão, porém, quando solubilizado no solvente orgânico dimetilsulfóxido, apresentou eficácia moderada (65 %). 32 …”

Section: Extratos Vegetais Como Inibidores De Cimunclassified

General Aspects of Corrosion and Plant Inhibitors

Felipe¹,

Maciel²,

Medeiros³

et al. 2013

Revista Virtual De Química

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Abstract:Corrosion is a natural process that can easily be found in different types of surfaces and represents a major cause of economic losses in the industrial sector. Nowadays, the corrosion control involves different aspects such as economical, technical, and environmental. Generally, the chemical, electrochemical or electrolytic corrosion processes are spontaneous, leading to modifications in the physicochemical characteristics of materials. In this article, it is included the biocorrosion, which is influenced by microorganisms. In general, corrosion inhibitors are highly toxic limiting both handling and disposal. Recently, great scientific interest is focused in the natural inhibitors from plant sources due to the significant microbiological control as well as inhibitive property on electrochemical corrosion. In addition, vegetal inhibitors represent an important alternative in a biotechnological context. Keywords: Vegetal species; corrosion; inhibitor. ResumoA corrosão constitui um processo natural que pode ser facilmente encontrado em diferentes tipos de superfícies e representa uma das principais causas de perdas econômicas no setor industrial. Atualmente, o controle da corrosão metálica tem fundamental importância econômica, técnica e ambiental. Geralmente os processos reacionais que desencadeiam a corrosão são espontâneos, de caráter químico, eletroquímico ou eletrolítico e tendem a modificar as características físico-químicas dos materiais. Incluída nesse contexto, encontra-se a biocorrosão, que é influenciada por microorganismos. No combate à corrosão, destacam-se em maior escala, os inibidores de corrosão de caráter químico que atuam eficazmente em qualquer tipo de processo corrosivo. De forma abrangente, os inibidores de corrosão são altamente tóxicos dificultando seu manuseio e descarte. Recentemente, inibidores de origem vegetal têm despertado interesse científico em função da atividade microbiológica, bem como ação de inibição a corrosão eletroquímica. Em adição, se enquadram em um contexto biotecnológico alternativo.

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Effectiveness of Croton cajucara Benth on corrosion inhibition of carbon steel in saline medium

Cited by 17 publications

References 18 publications

Chitosan as a green inhibitor for mild steel corrosion: Thermodynamic and electrochemical evaluations

Chitosan as a green inhibitor for mild steel corrosion: Thermodynamic and electrochemical evaluations

Green Methods for Corrosion Control

General Aspects of Corrosion and Plant Inhibitors

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