Corrosion and Corrosion Protection of Unio in Carbonic Acid Medium

Year : 2025 | Volume :11 | Issue : 01 | Page : 22-31
By
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Rajesh Kumar Singh,

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Pankaj Kumar Singh,

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Deepmala Kumari,

  1. Associate Professor, Department of Chemistry, Jagdam College, J P University, Chapra, Bihar, India
  2. Research Scholar, Department of Chemistry, J P University, Chapra, Bihar, India
  3. Research Scholar, Department of Chemistry, Jagdam College, J P University, Chapra, Bihar, India

Abstract

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Unio is a calciferous animal, and its outer surface is made of calcium carbonate. It usually happens in sources of sweet water. They create carbonic acid by absorbing carbon dioxide. It changes the pH of sweet water sources thus water becomes acidic. It develops corrosive environment for Unio. Carbonic acid interacts with Unio to form corrosion cells on the interface of Unio. This acid oxidizes calcium carbonate into calcium ions and slowly dissolution starts on their surface. Carbon acid produces galvanic, pitting, stress and crevice corrosion on the outer surface of calciferous animals. The corrosion rate of Unio calculated by weight loss and potentiostat techniques. Aloe vera was used as an inhibitor for the control corrosion of Unio in carbonin acid medium. It inhibits the action studied in different concentrations and temperatures. It contains electron rich organic compounds like anthraquinone, chromone, catechol, coumarin, lawsone, aloesin etc. These organic compounds formed a thin film on the surface of Unio by chemical bonding and they had capability to decrease the concentration of hydrogen ions. The inhibitor adsorption phenomenon studied by the use of Langmuir isotherm and its activation energy determined by Arrhenius equation. The bonding formation of Aloe vera on Unio interface confirmed by heat of adsorption, activation energy, free energy, enthalpy and entropy. This compound covered more surface area and produced high percentage inhibition efficiency.

Keywords: Unio, carbonic acid, Aloe vera, inhibition efficiency, thin film, chemical bonding

[This article belongs to Journal of Water Pollution & Purification Research (jowppr)]

How to cite this article:
Rajesh Kumar Singh, Pankaj Kumar Singh, Deepmala Kumari. Corrosion and Corrosion Protection of Unio in Carbonic Acid Medium. Journal of Water Pollution & Purification Research. 2025; 11(01):22-31.
How to cite this URL:
Rajesh Kumar Singh, Pankaj Kumar Singh, Deepmala Kumari. Corrosion and Corrosion Protection of Unio in Carbonic Acid Medium. Journal of Water Pollution & Purification Research. 2025; 11(01):22-31. Available from: https://journals.stmjournals.com/jowppr/article=2025/view=0

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Regular Issue Subscription Original Research
Volume 11
Issue 01
Received 23/12/2024
Accepted 29/12/2024
Published 25/01/2025
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