A combined experimental and theoretical study of the inhibition effect of three disulfide-based flavouring agents for copper corrosion in 0.5 M sulfuric acid

Bochuan Tan; Shengtao Zhang; Yujie Qiang; Lei Guo; Li Feng; Chaohui Liao; Yue Xu; Shijin Chen

doi:10.1016/j.jcis.2018.04.092

A combined experimental and theoretical study of the inhibition effect of three disulfide-based flavouring agents for copper corrosion in 0.5 M sulfuric acid

J Colloid Interface Sci. 2018 Sep 15:526:268-280. doi: 10.1016/j.jcis.2018.04.092. Epub 2018 Apr 25.

Authors

Bochuan Tan¹, Shengtao Zhang², Yujie Qiang³, Lei Guo⁴, Li Feng¹, Chaohui Liao¹, Yue Xu¹, Shijin Chen⁵

Affiliations

¹ School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China.
² School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China. Electronic address: stzhang@cqu.edu.cn.
³ School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China; School of Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000, China.
⁴ School of Material and Chemical Engineering, Tongren University, Tongren 554300, China.
⁵ Bomin Electronics Ltd, Meizhou 514021, China.

PMID: 29747040
DOI: 10.1016/j.jcis.2018.04.092

Abstract

Diallyl disulfide (DAD), propyl disulfide (PPD) and dibenzyl disulfide (DBD) flavouring agents as copper corrosion inhibitors in 0.5 mol/L H₂SO₄ solution were evaluated with multitudinous experiments including electrochemical techniques, morphological characterization measurements, FTIR spectra and theoretical calculations. The electrochemical results indicate that PPD and DBD show mixed-type inhibitors and DAD belongs to cathodic-type inhibitor, and the corrosion inhibition capacity follow order: PPD > DBD > DAD. The adsorption of these compounds on the surface of copper conforms to the Langmuir adsorption isotherm model. Furthermore, theoretical calculations were applied to deeply understand the inhibition mechanism of three disulfide-based compounds.

Keywords: Acid inhibition; Copper; Corrosion inhibitor; Polarization; Theoretical calculation.