Zwitterions and betaines as highly soluble materials for sustainable corrosion protection: Interfacial chemistry and bonding with metal surfaces

Chandrabhan Verma, Shikha Dubey, Ranjith Bose, Akram Alfantazi, Eno E. Ebenso, Kyong Yop Rhee

Research output: Contribution to journalReview articlepeer-review

3 Citations (Scopus)

Abstract

The primary requirements for interfacial adsorption and corrosion inhibition are solubility and the existence of polar functional groups, particularly charges. Traditional organic inhibitors have a solubility issue due to the hydrophobic moieties they incorporate. Most documented organic inhibitors have aromatic rings, hydrocarbon chains, and a few functional groups. The excellent solubility and high efficacy of zwitterions and betaines make them the perfect replacements for insoluble corrosion inhibitors. Zwitterions and betaines are more easily soluble because of interactions between their positive and negative charges (–COO, –PO3 , –NH3, –NHR2, –NH2R, –SO3 etc.) and the polar solvents. The positive and negative charges also aid these molecules' physical and chemical adsorption at the metal-electrolyte interfaces. They develop a corrosion-inhibiting layer through their adsorption. After becoming adsorbed at the metal-electrolyte interface, they act as mixed-type inhibitors, slowing both cathodic and anodic processes. They usually adsorb according to the Langmuir adsorption isotherm. In this article, the corrosion inhibition potential of zwitterions and betaines in the aqueous phase, as well as their mode of action, are reviewed. This article details the advantages and disadvantages of utilizing zwitterions and betaines for sustainable corrosion protection.

Original languageEnglish
Article number103091
JournalAdvances in Colloid and Interface Science
Volume324
DOIs
Publication statusPublished - Feb 2024

Bibliographical note

Publisher Copyright:
© 2024 Elsevier B.V.

Keywords

  • Amphoteric compounds
  • Betaines
  • Corrosion inhibition and interfacial adsorption
  • Zwitterions

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