Greener Approach towards Corrosion Inhibition

Corrosion control of metals is technically, economically, environmentally, and aesthetically important. The best option is to use inhibitors for protecting metals and alloys against corrosion. As organic corrosion inhibitors are toxic in nature, so green inhibitors which are biodegradable, without any heavy metals and other toxic compounds, are promoted. Also plant products are inexpensive, renewable, and readily available. Tannins, organic amino acids, alkaloids, and organic dyes of plant origin have good corrosion-inhibiting abilities. Plant extracts contain many organic compounds, having polar atoms such as O, P, S, and N. These are adsorbed on the metal surface by these polar atoms, and protective films are formed, and various adsorption isotherms are obeyed. Various types of green inhibitors and their effect on different metals are mentioned in the paper.

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The inhibition effects of methionine on mild steel in acidic media

Analele Universitatii Ovidius Constanta - Seria Chimie ◽

10.2478/auoc-2014-0007 ◽

2014 ◽

Vol 25 (1) ◽

pp. 39-42

Author(s):

Albana Jano ◽

Alketa Lame ◽

Efrosini Kokalari

Keyword(s):

Heavy Metals ◽

Corrosion Inhibitors ◽

Inhibition Efficiency ◽

Corrosion Current ◽

Chloride Ions ◽

Reinforcing Bars ◽

Polarization Method ◽

Acidic Media ◽

Toxic Compounds ◽

Inhibition Effect

Abstract The corrosion of metal surfaces causes huge financial damages to the industries annually, what has lead to an increase in the search for substances that can slow down or prevent corrosion rate. Green inhibitors which are biodegradable, without any heavy metals and other toxic compounds, are promoted. Amino acids are attractive as corrosion inhibitors because they are nontoxic. We have used methionine as corrosion inhibitor. Materials under investigation are two kind of low allow carbon steel marked as: Steel 39, Steel 44 usually applied to concrete as reinforcing bars, and manufacture in Elbasan. The inhibition effect of methionine on the corrosion behavior of low allow steel is investigated in sulfuric acid in presence of chloride ions, in form of NaCl (H2SO4 1M + Cl- 10-3M). Potentiodynamic polarization method is used for inhibitor efficiency testing. The pitting corrosion current shows that increasing concentration of the inhibitor causes a decrease in pitting current density, and inhibition efficiency increases with increasing concentration of the inhibitors.

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Green Inhibitors for Corrosion Protection of Metals and Alloys: An Overview

International Journal of Corrosion ◽

10.1155/2012/380217 ◽

2012 ◽

Vol 2012 ◽

pp. 1-15 ◽

Cited By ~ 165

Author(s):

B. E. Amitha Rani ◽

Bharathi Bai J. Basu

Keyword(s):

Corrosion Inhibitors ◽

Organic Dyes ◽

Sol Gel ◽

Metals And Alloys ◽

Self Healing ◽

Plant Materials ◽

Time Required ◽

Organic Corrosion Inhibitors ◽

Green Corrosion Inhibitors ◽

Protection Of Metals

Corrosion control of metals is of technical, economical, environmental, and aesthetical importance. The use of inhibitors is one of the best options of protecting metals and alloys against corrosion. The environmental toxicity of organic corrosion inhibitors has prompted the search for green corrosion inhibitors as they are biodegradable, do not contain heavy metals or other toxic compounds. As in addition to being environmentally friendly and ecologically acceptable, plant products are inexpensive, readily available and renewable. Investigations of corrosion inhibiting abilities of tannins, alkaloids, organic,amino acids, and organic dyes of plant origin are of interest. In recent years, sol-gel coatings doped with inhibitors show real promise. Although substantial research has been devoted to corrosion inhibition by plant extracts, reports on the detailed mechanisms of the adsorption process and identification of the active ingredient are still scarce. Development of computational modeling backed by wet experimental results would help to fill this void and help understand the mechanism of inhibitor action, their adsorption patterns, the inhibitor-metal surface interface and aid the development of designer inhibitors with an understanding of the time required for the release of self-healing inhibitors. The present paper consciously restricts itself mainly to plant materials as green corrosion inhibitors.

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Evaluation of different analytical methodologies for the analysis of amino acids in plant extracts

Planta Medica ◽

10.1055/s-0028-1084629 ◽

2008 ◽

Vol 74 (09) ◽

Author(s):

M Nasimullah Qureshi ◽

G Stecher ◽

MA Hashir ◽

T Sultana ◽

G Abel ◽

...

Keyword(s):

Amino Acids ◽

Plant Extracts

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Parameters Affecting Dye Adsorption - Using Graphene Coated Sand (GSC)

International Journal of Science and Engineering Invention ◽

10.23958/ijsei/vol04-i02/01 ◽

2018 ◽

Vol 4 (02) ◽

Author(s):

Seroor Atalah Khaleefa Alia ◽

Dr. Mohammed Ibrahimb ◽

Hussein Ali Hussein

Keyword(s):

Heavy Metals ◽

Contact Time ◽

Organic Dyes ◽

Low Cost ◽

Dye Adsorption ◽

Contaminated Water ◽

Maximum Adsorption Capacity ◽

Engineering Designs ◽

Heavy Metals Ions ◽

Coated Sand

Adsorption is most commonly applied process for the removal of pollutants such as dyes and heavy metals ions from wastewater. The present work talks about preparing graphenic material attached sand grains called graphene sand composite (GSC) by using ordinary sugar as a carbon source. Physical morphology and chemical composition of GSC was examined by using (FTIR, SEM, EDAX and XRD). Efficiency of GSC in the adsorption of organic dyes from water was investigated using reactive green dye with different parameters such as (ph, temperature, contact time and dose). Adsorption isotherm was also studied and the results showed that the maximum adsorption capacity of dye is 28.98 mg/g. This fast, low-cost process can be used to manufacture commercial filters to treat contaminated water using appropriate engineering designs.

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Application of modified green algae Nannochloropsis sp. as adsorbent in the simultaneous adsorption of Methylene Blue and Cu(II) cations in solution

Sustainable Environment Research ◽

10.1186/s42834-021-00090-y ◽

2021 ◽

Vol 31 (1) ◽

Author(s):

Buhani ◽

Tri Agus Wijayanti ◽

Suharso ◽

Sumadi ◽

Muslim Ansori

Keyword(s):

Heavy Metals ◽

Methylene Blue ◽

Green Algae ◽

Contact Time ◽

Organic Dyes ◽

Silica Matrix ◽

Particle Coating ◽

Adsorption Data ◽

Magnetite Particles ◽

Simultaneous Sorption

AbstractBiomass of algae is a very potent adsorbent for absorbing aqueous waste containing heavy metals and organic dyes. This study purposes to confirm the ability of adsorbents from green algae Nannochloropsis sp. modified with silica (ASN) and followed by coating magnetite particles (ASN-MPs) to absorb simultaneously the mixture of Methylene Blue (ME) and Cu(II) cations in aqueous solution. Simultaneous sorption of ME and Cu(II) cations to ASN and ASN-MPs was carried out by the batch method with the interaction pH condition 7, contact time 90 min, and initial concentrations of ME and Cu(II) cations (0.1–1.0 mM). Based on adsorption data, Cu(II) cations have a greater adsorption rate and capacity (qm) compared to ME at the same contact time and initial concentration. The adsorption capacity (qm) values of the bi-component ME and Cu(II) cation mixture in ASN and ASN-MPs were 1.39 × 10− 1 and 5.32 × 10− 1 mmol g− 1, respectively, with the binary Langmuir adsorption isotherm constant for Cu(II) cations greater than ME. Modified adsorbent from algae Nannochloropsis sp. with silica matrix and magnetite particle coating is an adsorbent that has a high effectiveness in the collective sorption of ME and Cu(II) cations. Therefore, these adsorbents can be used for the adsorption of cation mixtures of heavy metals and organic dyes that are cationic in solution.

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Toward understanding the adsorption mechanism of large size organic corrosion inhibitors on an Fe(110) surface using the DFTB method

RSC Advances ◽

10.1039/c7ra04120a ◽

2017 ◽

Vol 7 (46) ◽

pp. 29042-29050 ◽

Cited By ~ 56

Author(s):

Lei Guo ◽

Chengwei Qi ◽

Xingwen Zheng ◽

Renhui Zhang ◽

Xun Shen ◽

...

Keyword(s):

Metal Surface ◽

Corrosion Inhibitors ◽

Adsorption Mechanism ◽

Large Size ◽

Organic Corrosion Inhibitors

Compared with the conventional DFT approach, SCC-DFTB method is more effective to deal with the adsorption issues of large size organic corrosion inhibitors on metal surface.

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