<abstract xmlns="http://www.w3.org/1999/xhtml">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.</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.

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

Natural Sciences Faculty, Chemistry Department, Tirana University, Bulevardi Zogu i Parë, Tirana, Albania

Ovidius University Annals of Chemistry

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Lysine as corrosion inhibitor for low alloy carbon steel in acidic media"}

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...

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

Published Online: Sep 12, 2014

Page range: 11 - 14

Received: Feb 18, 2014

Accepted: Mar 28, 2014

DOI: https://doi.org/10.2478/auoc-2014-0002

Keywords
lysine, amino acid, steel bars, Tafel polarization

© Ovidius University Press

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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

Published Online: Sep 12, 2014

Page range: 11 - 14

Received: Feb 18, 2014

Accepted: Mar 28, 2014

DOI: https://doi.org/10.2478/auoc-2014-0002

Keywordslysine, amino acid, steel bars, Tafel polarization

© Ovidius University Press

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
lysine, amino acid, steel bars, Tafel polarization