RESEARCH ARTICLE


Investigation of Lignosulphonate Mannich Bases as Corrosion Inhibitors



Hua-rui Hao1, Yan-qing Miao2, *
1 School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, China
2 Department of Pharmacology, Xi’an Medical University, Xi’an, 710068, China


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Creative Commons License
© 2015 Hao and Miao

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Pharmacology, Xi’an Medical University, Xi’an, 710068, China; E-mail: miaoyanqing2006@163.com


Abstract

To seek for new acidic corrosion inhibitor, this work used aliphatic amine, formaldehyde and sodium lignosulphonate as the raw materials to prepare new Mannich bases as eco-friendly corrosion inhibitors. The inhibition of these Mannich bases for mild steel corrosion in 2M HCl solution was investigated by weight loss technique. Through the single factor experiments, the optimal mole ratio was determined. Meanwhile, the influences of temperature and inhibitor dosage on the corrosion inhibition performance of the products were studied. The adsorptions on the surface of mild steel and inhibition mechanism were also discussed. Potentiodynamic polarization studies indicate that extracts are mixed-type inhibitors.

Keywords: Sodium lignosulphonate, Mannich base, Acidification, Corrosion inhibitor.



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