4-Hydroxyl-N0 -[(3-Hydroxy-4-Methoxyphenyl) Methylidene] Benzohydrazide] as Corrosion Inhibitor for Carbon Steel in Dilute H2SO4

Poojary, Nikshith G and Kumari, Preethi P and Rao, Suma (2021) 4-Hydroxyl-N0 -[(3-Hydroxy-4-Methoxyphenyl) Methylidene] Benzohydrazide] as Corrosion Inhibitor for Carbon Steel in Dilute H2SO4. journal of Failure analysis and Prevention, 21. pp. 1264-1273. ISSN 1547-7029

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Abstract

The effect of an aromatic hydrazide derivative 4-hydroxyl-N0 -[(3-hydroxy-4-methoxyphenyl) methyli�dene] benzohydrazide] (HMBH) as inhibitor for the corrosion of carbon steel in 0.5 M H2SO4 solution was investigated in the temperature range of 303 K to 323 K using potentiodynamic polarization (PDP) and electro�chemical impedance spectroscopy (EIS). The concentration of HMBH used was in the range of 0.1 to 1 mM. Inhibition efficiency (% IE) increased with increase in concentration of HMBH and decreased with increase in temperature. Maximum % IE obtained was around 71 with 1 � 10-3 M HMBH in 0.5 M H2SO4 at 303 K. The Tafel polarization results indicate that HMBH acted as a mixed type of inhibitor. The results of evaluation of thermodynamic and activation parameters suggest the mixed adsorption of HMBH took place by physisorption, and it obeyed Fre�undlich’s isotherm. Scanning electron microscope (SEM) and atomic force spectroscopy (AFM) images were also recorded to supplement the results of electrochemical studies, and mechanism for corrosion inhibition was suggested.

Item Type: Article
Uncontrolled Keywords: Carbon steel � Aromatic hydrazide � Acid corrosion � Electrochemical methods � Adsorption studies � Surface morphology
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 09 Dec 2021 10:01
Last Modified: 09 Dec 2021 10:01
URI: http://eprints.manipal.edu/id/eprint/157493

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