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Experimental and theoretical studies for mild steel corrosion inhibition in 1 M HCl by two new benzothiazine derivatives

Authors
Journal
Corrosion Science
0010-938X
Publisher
Elsevier
Volume
76
Identifiers
DOI: 10.1016/j.corsci.2013.06.052
Keywords
  • A. Acid Solutions
  • A. Mild Steel
  • B. Eis
  • B. Polarization
  • C. Acid Corrosion
  • C. Acid Inhibition
Disciplines
  • Chemistry

Abstract

Abstract The inhibition effect of new heterocyclic compounds, namely 2-aryl-benzothiazin-3-one (P1) and 3-aryl-benzothiazin-2-one (P2) on mild steel corrosion in 1M HCl was investigated using electrochemical measurements. The results indicated that the inhibition efficiency depends on concentration and molecular structure of the investigated compounds. It is also found that the inhibition of P1 is greater than P2. The molecular structure effect on the corrosion inhibition efficiency was investigated using DFT calculations. The structural and electronic parameters were calculated and discussed. The obtained results show that the experimental and theoretical studies agree well and confirm that P1 is the better inhibitor.

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