Accumulation of 2-Acetylamino-5-mercapto-1,3,4-thiadiazole in chitosan coatings for improved anticorrosive effect on zinc

Árpád Ferenc Szőke; Gabriella Stefánia Szabó; Zoltán Hórvölgyi; Emőke Albert; Attila Gergely Végh; László Zimányi; Liana Maria Muresan

doi:10.1016/j.ijbiomac.2019.09.114

Accumulation of 2-Acetylamino-5-mercapto-1,3,4-thiadiazole in chitosan coatings for improved anticorrosive effect on zinc

Int J Biol Macromol. 2020 Jan 1:142:423-431. doi: 10.1016/j.ijbiomac.2019.09.114. Epub 2019 Oct 5.

Authors

Árpád Ferenc Szőke¹, Gabriella Stefánia Szabó², Zoltán Hórvölgyi³, Emőke Albert³, Attila Gergely Végh⁴, László Zimányi⁴, Liana Maria Muresan⁵

Affiliations

¹ Babeş-Bolyai University, Faculty of Chemistry and Chemical Engineering, Research Center in Electrochemistry and Non-conventional Materials, 11 Arany János St., Cluj-Napoca RO-400028, Romania; Department of Chemical Engineering, Babeş-Bolyai University, 11 Arany János St., Cluj-Napoca RO-400028, Romania.
² Babeş-Bolyai University, Faculty of Chemistry and Chemical Engineering, Research Center in Electrochemistry and Non-conventional Materials, 11 Arany János St., Cluj-Napoca RO-400028, Romania; Department of Chemistry and Chemical Engineering of the Hungarian Line, Babeş-Bolyai University, 11 Arany János St., Cluj-Napoca RO-400028, Romania.
³ Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, Department of Physical Chemistry and Materials Science, Centre for Colloid Chemistry, Budafoki út 6-8, Budapest HU-1111, Hungary.
⁴ Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Temesvári Krt. 62, Szeged H-6726, Hungary.
⁵ Babeş-Bolyai University, Faculty of Chemistry and Chemical Engineering, Research Center in Electrochemistry and Non-conventional Materials, 11 Arany János St., Cluj-Napoca RO-400028, Romania; Department of Chemical Engineering, Babeş-Bolyai University, 11 Arany János St., Cluj-Napoca RO-400028, Romania. Electronic address: limur@chem.ubbcluj.ro.

PMID: 31593734
DOI: 10.1016/j.ijbiomac.2019.09.114

Abstract

Chitosan (Chit) coatings were applied on zinc substrates by the dip-coating method. Subsequently, the coatings were impregnated with a corrosion inhibitor, 2-Acetylamino-5-mercapto-1,3,4-thiadiazole (AcAMT) to obtain an increased anticorrosive effect. The coating thickness and the AcAMT accumulation were determined using UV-Vis spectroscopy on glass and quartz substrates, respectively. The surface morphology and coverage were investigated with atomic force microscopy. Electrochemical impedance spectroscopy and potentiodynamic polarization techniques were used to investigate the protective properties of the impregnated coatings. The chitosan coatings facilitated the accumulation of the corrosion inhibitor inside the polymeric matrix (a multiplication of 380 times compared to the impregnating solution concentration was calculated), channeling high amounts of AcAMT to the Zn surface, which resulted in an inhibition efficiency of >90%. This effect demonstrates the applicability of chitosan coatings as carriers for corrosion inhibitors, significantly reducing the amount of inhibitor needed to achieve good anticorrosive effects.

Keywords: 2-Acetylamino-5-mercapto-1,3,4-thiadiazole; Chitosan; Zinc corrosion.

MeSH terms

Chitosan / chemistry*
Coated Materials, Biocompatible / chemistry*
Corrosion*
Dielectric Spectroscopy
Materials Testing
Microscopy, Atomic Force
Molecular Structure
Spectrum Analysis
Surface Properties
Thiadiazoles / chemistry*
Zinc / chemistry*

Substances

Coated Materials, Biocompatible
Thiadiazoles
5-mercapto-1,3,4-thiadiazole
Chitosan
Zinc