Controlling the Rate of Dissolution of Mild Steel in Sulfuric Acid Through the Adsorption and Inhibition Characteristics of (4-(4-Hydroxybenzylideneamino)-4H-1,2,4-Triazole-3,5-diyl)dimethanol (HATD)

• Published in: Journal of bio- and tribo-corrosion 2017-03, Vol.3 (1), p.1-11, Article 10
• Main Authors: Prajila, M., Joseph, Abraham
• Format: Article
• Language: English
• Subjects: Adsorption; Biomaterials; Chemistry and Materials Science; Corrosion; Corrosion and Coatings; Dissolution; Free energy; Materials Science; Morphology; Polarization; Solid Mechanics; Sulfuric acid; Temperature effects; Triazoles; Tribology
• ISSN: 2198-4220; 2198-4239
• DOI: 10.1007/s40735-016-0070-z

Inhibition of mild steel corrosion in H 2 SO 4 using a Schiff’s base derived from 1,2,4-triazole, (4-(4-hydroxybenzylideneamino)-4H-1,2,4-triazole-3,5-diyl) dimethanol, has been investigated by weight loss, electrochemical, surface morphological, adsorption, and quantum chemical studies. It is found that inhibition efficiency increases with concentration of inhibitor and decreases with temperature. Results of polarization studies revealed the mixed type behavior of the inhibitor. Adsorption phenomenon follows Langmuir isotherm model, and values of free energy changes indicate that the mechanism involves both physisorption and chemisorption. Values of activation parameters revealed the endothermic nature of the corrosion process. Surface morphological studies support the prediction of the protection of metal by the formation of a surface film in the presence of the inhibitor. Geometry optimization of the inhibitor molecule is done by quantum chemical studies.