Lysine as corrosion inhibitor for low alloy carbon steel in acidic media

Abstract The use of inhibitors is one of the most practical means for protecting metals against corrosion, especially in acidic media. The interest is to use organic compounds as inhibitors due mainly to their inherent and non-toxic nature. Amino acids are attractive as corrosion inhibitors because they are nontoxic, relatively easy to produce with high purity at low cost, and are soluble in aqueous media. Lysine, one kind of amino acid is used as inhibitor. The aims of this study are to show corrosion protection efficiency of lysine and to explain the mechanism of corrosion. The experimental results demonstrated that the lysine offered protection for low alloy carbon steel in aggressive environments like H2SO4. Materials under investigation are two types of low alloy carbon steel marked as: Steel 39, Steel 44 (usually applied to concrete as reinforcing bars). The corrosion media consists in sulfuric acid in presence of chloride ions, in form of NaCl (H2SO4 1M + Cl- 10-3M). Potentiodynamic polarization methods are used for inhibitor efficiency testing. Potentiodymanic polarization measurements showed that the presence of lysine in acidic solution decreases the corrosion current to a good extent. The corrosion inhibition efficiency improves with the increase of the lysine concentration. The use of this inhibitor (1g/L) protects steel 39 in acidic media with 78.88% efficiency. That means lysine is a good corrosion inhibitor for these aggressive conditions.

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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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AERVA LANATA LEAF EXTRACT AS A CORROSION INHIBITOR FOR CARBON STEEL IN CHLORIDE ENVIRONMENT

International Journal of Research -GRANTHAALAYAH ◽

10.29121/granthaalayah.v6.i11.2018.1084 ◽

2018 ◽

Vol 6 (11) ◽

pp. 153-162

Author(s):

Rajesh V. ◽

E. U. B. Reddi ◽

T. Byragi Reddy ◽

Ch. Durga Prasad ◽

B. Prasanna Kumar

Keyword(s):

Carbon Steel ◽

Corrosion Inhibitor ◽

Leaf Extract ◽

Inhibition Efficiency ◽

Aggressive Medium ◽

Chloride Ions ◽

Aqueous Environment ◽

Aerva Lanata ◽

Ph Range ◽

Chloride Environment

The present study was initiated with an objective of investigating a plant extract as an effective corrosion inhibitor useful for protection of carbon steel in aqueous environment containing chloride ions. For this purpose, the leaf extract of the plant ‘Aerva lanata’ belonging to Amaranthaceae family of genus Aerva was chosen. The required optimum concentration of the extract for an effective inhibition was found to be 5 %, resulting in the inhibition efficiency of 95 % against corrosion of carbon steel in 200 ppm of NaCl solution. The extract introduced as a corrosion inhibitor was found to be effective in the pH range from 4.0 to 9.0. The extract could retain its inhibition efficiency for about an immersion period of 60 days and also up to a temperature of 333 K. The 5 % extract was found to control corrosion of carbon steel in highly aggressive medium containing 300 ppm of NaCl also. In order to maintain the protective nature, the required concentration of the extract was 2 %. From these studies, it was inferred that the Aerva lanata leaf extract exhibits good inhibitive properties for carbon steel in aqueous environment in wide ranges of pH, temperature and aggressiveness of medium.

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Protective behavior of volatile corrosion inhibitor on atmospheric corrosion process of carbon steel under thin electrolyte liquid film of chloride solutions

Materials Express ◽

10.1166/mex.2020.1778 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1435-1443

Author(s):

Dong Wang ◽

Chenxi Wang ◽

Changqing Fang ◽

Xing Zhou ◽

Mengyuan Pu ◽

...

Keyword(s):

Corrosion Resistance ◽

Carbon Steel ◽

Liquid Film ◽

Corrosion Inhibitor ◽

Current Density ◽

Atmospheric Corrosion ◽

Corrosion Current Density ◽

Corrosion Current ◽

Corrosion Process ◽

Closed Container

The corrosion process of carbon steel and corrosion resistance behavior of volatile corrosion inhibitor (VCI) under thin electrolyte liquid film containing chloride was investigated by electrochemical measurements and surface characterization. Results indicated that composite VCI was composed of sodium molybdate and sodium benzoate, and exhibited higher corrosion resistance in 3.5% NaCl solution compared with absence of VCI. The corrosion current density obviously decreased with presence of VCI, and the synergies between binary components increased the corrosion inhibiting rate on carbon steel to up to 90%. The corrosion current density of carbon steel increased with increased temperature after volatilization of VCI. A closed container was carried out to mimic atmospheric corrosion condition, and its vapor corrosion inhibition property was evaluated in this closed container. Results showed that the VCI acted as an inhibitor by suppressing anodic dissolution and metallic ion transfer through the formation of protective film. It was also observed that the variation of carbon steel surface with volatilization of VCI was assessed by atomic force microscope (AFM) and scanning electron microscope (SEM). The anodic process for carbon steel without VCI affected the corrosion rate due to accumulation of corrosion products, while the morphology of carbon steel was hardly changed with volatilization of VCI. The results showed that the VCI volatilized to the surface and form to protect film. VCI was automatically volatilized into gas, which protected steel from corrosion. This composite VCI can then be applied as a significant corrosion inhibition method.

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Evaluation of Palm Kernel Cake Powder (Elaeis guineensis Jacq.) as Corrosion Inhibitor for Carbon Steel in Acidic Media

Metals and Materials International ◽

10.1007/s12540-019-00559-x ◽

2020 ◽

Cited By ~ 2

Author(s):

A. M. Santos ◽

I. P. Aquino ◽

F. Cotting ◽

I. V. Aoki ◽

H. G. de Melo ◽

...

Keyword(s):

Carbon Steel ◽

Corrosion Inhibitor ◽

Elaeis Guineensis ◽

Palm Kernel ◽

Palm Kernel Cake ◽

Acidic Media ◽

Elaeis Guineensis Jacq

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Green Corrosion Inhibitor of Low Carbon Steel in Acidic Media by Pectin Nanoparticles Using Potentiostatic and Weight Losses Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1021.241 ◽

2021 ◽

Vol 1021 ◽

pp. 241-250

Author(s):

Basheer A. Abdulhessein ◽

Alaa Mashjel Ali

Keyword(s):

Carbon Steel ◽

Corrosion Rate ◽

Corrosion Inhibitor ◽

Low Carbon Steel ◽

Maximum Level ◽

Low Carbon ◽

Acidic Media ◽

Weight Losses ◽

Green Corrosion Inhibitor ◽

Film Development

In the present work, corrosion inhibition of low carbon steel in a 1M H2SO4 solution by pectin nanoparticles extract was studied by potentiostatic and weight loss methods. Increasing the acid concentration leads to an increase in the corrosion rate of the electrode. The variable conditions of the pectin nanoparticles used in this investigation are (2 to 10g/l at 25oC). It was found that the concentrates acts as a compelling consumption inhibitor for gentle steel in an acidic medium. The hindrance process is credited to the adsorbed film development of the inhibitor on the metal surface of that protects the metal against corrosion. It was observed that the efficiency of the inhibition rose with increased inhibitor concentration up to the maximum level of 92% for 10 g/l at 25 oC. The results showed that the corrosion rate without the inhibitor was 2.263mpy while with the inhibitor 0.179 mpy, meaning that the rate of corrosion improved more than 90%. The results of the immersion time (1 h) at 25oC on the inhibition of the corrosion also indicated improved corrosion resistance. The results demonstrated that an extract of pectin nanoparticles could serve as an excellent eco-friendly, green corrosion inhibitor. Fourier- transform infrared spectroscopy (FTIR) results indicate that these nanoparticles contain various chemical bonds (C-C, CH2, C-O-C, and cellulose) with metal surfaces, lead to producing a barrier layer that protects the surface.

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