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Electrochemistry of corrosion mitigation of brasses by azoles in basic medium

  • Fouzia Altaf
  • Rumana Qureshi
  • Azra Yaqub
  • Safeer AhmedEmail author
Original Paper
  • 17 Downloads

Abstract

The article describes the corrosion inhibition effects of four metal cations (Al, Sn, Pb, Mn) as dopants and five azoles as outer protective layers on pure copper and four brass alloys in borate buffer at pH 10.4. The electrochemical behavior of the four doped brasses, i.e., CuZnAl, CuZnSn, CuZnPb and CuZnMn was investigated using cyclic voltammetry (CV), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy. The corrosion rate (CR) of all the brasses was found slower than that of pure Cu (0.132 mm year−1) due to the presence of dopant ions, i.e., CuZnMn had the highest CR, 0.019 mm year−1 and CuZnAl had the lowest 0.009 mm year−1. Five azoles, namely benzotriazole, mercaptobenzothiazole (MBT), benzimidazole, mercaptobenzimidazole and thiadiazole, were successfully employed as efficient corrosion retarders for the brasses. Their concentration-dependent corrosion inhibition was attributed to the spontaneous chemisorption on alloy surface following Langmuir isotherm pattern. Among all the inhibitors, MBT showed maximum corrosion inhibition efficiency between 91 and 96% for different brasses. The impedance modulus markedly increased with inhibitor concentration, revealing a protective effect of these corrosion inhibitors and thus complementing the CV and PDP results.

Keywords

Brass Cation doping Azoles Corrosion Impedance 

Notes

Acknowledgements

The authors acknowledge the enabling role of the Higher education Commission Islamabad, Pakistan, and appreciate its financial support through “Indigenous Scholarship PhD Program Phase III” for the studies.

Compliance with ethical standards

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

Supplementary material

11696_2018_673_MOESM1_ESM.docx (127 kb)
Supplementary material 1 (DOCX 126 kb)

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2019

Authors and Affiliations

  1. 1.Electrochemistry Group (ECG), Department of ChemistryQuaid-i-Azam UniversityIslamabadPakistan

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