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Adsorption and corrosion inhibition of mild steel i n 0.5 M H 2 SO 4 by a new thiazine derivative 2H-benzo[b][1,4]thiazin-3(4H)-o ne using experimental and theoretical approaches | Abstract

Der Pharma Chemica
Journal for Medicinal Chemistry, Pharmaceutical Chemistry, Pharmaceutical Sciences and Computational Chemistry

ISSN: 0975-413X

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Abstract

Adsorption and corrosion inhibition of mild steel i n 0.5 M H 2 SO 4 by a new thiazine derivative 2H-benzo[b][1,4]thiazin-3(4H)-o ne using experimental and theoretical approaches

Author(s): A. Elyoussfi 1 , H. Elmsellem 1 , A. Dafali 1 , K. Cherrak 1 , N. K. Sebbar 2 , A. Zarrouk 1 , E. M. Essassi 2 , A. Aouniti 1 , B. El Mahi 1 and B. Hammouti 1

The inhibition effect of 2H-benzo[b][1,4]thiazin-3( 4H)-one (T1) on the corrosion of mild steel in 0.5 M H2SO4 was studied by weight loss, electrochemical impedance s pectroscopy (EIS) techniques and potentiodynamic po larization methods. The results showed that (T1) was a good in hibitor in 0.5 M H2SO4 and inhibition efficiency in creases with (T1) concentration to attain 91% at 10-3M at 308 K. E(%) values obtained from various methods used are reasonably good agreement. The adsorption of (T1)ob eyed the Langmuir adsorption isotherm. Polarization curves showed that (T1) acted as a mixed-type inhibitor in sulfuric acid. Quantum chemical approach used to calculate electronic properties of the molecule to ascertain the relation between inhibitive effect and molecula r structure.


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