# Thermodynamic study of mild steel corrosion in hydrochloric acid by new class synthesized quinoxaline derivatives: Part II

Thermodynamic study of mild steel corrosion in hydrochloric acid by new class synthesized... The inhibition action of (E)-7-chloro-3-(4-methoxystyryl)quinoxalin-2(1H)-one (Q1) and 7-chloro-2-(4-methoxyphenyl)thieno(3.2-b)quinoxaline (Q2) have been investigated for mild steel corrosion in 1 M HCl at different temperatures ranges (303–333 K) using potentiodynamic polarization curves. It was found that the studied compounds exhibit a very good performance as corrosion inhibitors for mild steel in 1 M HCl. Results show that the inhibition efficiency increases with decreasing temperature and increasing inhibitors concentration. Thermodynamic parameters such as adsorption heat ( $$\Updelta H_{\text{ads}}^{*}$$ ), adsorption entropy ( $$\Updelta S_{\text{ads}}^{*}$$ ) and adsorption free energy ( $$\Updelta G_{\text{ads}}^{*}$$ ) were obtained from experimental data at temperatures ranging from 303 to 333 K. Other thermodynamic parameters such as E a, $$\Updelta H_{\text{a}}^{*}$$ , $$\Updelta S_{\text{a}}^{*}$$ and pre-exponential factor have been calculated and discussed. Adsorption follows the Langmuir isotherm with negative values of free enthalpy suggesting a spontaneous adsorption process. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

# Thermodynamic study of mild steel corrosion in hydrochloric acid by new class synthesized quinoxaline derivatives: Part II

, Volume 39 (9) – Nov 30, 2012
14 pages

/lp/springer_journal/thermodynamic-study-of-mild-steel-corrosion-in-hydrochloric-acid-by-b8KPhfNoUP
Publisher
Springer Journals
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-012-0934-x
Publisher site
See Article on Publisher Site

### Abstract

The inhibition action of (E)-7-chloro-3-(4-methoxystyryl)quinoxalin-2(1H)-one (Q1) and 7-chloro-2-(4-methoxyphenyl)thieno(3.2-b)quinoxaline (Q2) have been investigated for mild steel corrosion in 1 M HCl at different temperatures ranges (303–333 K) using potentiodynamic polarization curves. It was found that the studied compounds exhibit a very good performance as corrosion inhibitors for mild steel in 1 M HCl. Results show that the inhibition efficiency increases with decreasing temperature and increasing inhibitors concentration. Thermodynamic parameters such as adsorption heat ( $$\Updelta H_{\text{ads}}^{*}$$ ), adsorption entropy ( $$\Updelta S_{\text{ads}}^{*}$$ ) and adsorption free energy ( $$\Updelta G_{\text{ads}}^{*}$$ ) were obtained from experimental data at temperatures ranging from 303 to 333 K. Other thermodynamic parameters such as E a, $$\Updelta H_{\text{a}}^{*}$$ , $$\Updelta S_{\text{a}}^{*}$$ and pre-exponential factor have been calculated and discussed. Adsorption follows the Langmuir isotherm with negative values of free enthalpy suggesting a spontaneous adsorption process.

### Journal

Research on Chemical IntermediatesSpringer Journals

Published: Nov 30, 2012

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