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Furan and Phenyl Substituted Triazolothiadiazine Derivatives as Copper Corrosion Inhibitors: Electrochemical and DFT Studies

  • Nasima ArshadEmail author
  • Fouzia Altaf
  • Muhammad Akram
  • Mehboob Ullah
PHYSICOCHEMICAL PROBLEMS OF MATERIALS PROTECTION
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Abstract

This paper presents experimental aspects of two triazolodiathiazine derivatives 1 {1-(6,7-di(furan-2-yl)-7H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazin-3-yl)ethanol} and 2 {6-phenyl-7H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazin-3-yl)ethanol} as copper corrosion inhibitors in borate (pH 8.4 and 10.4) aggressive media. Electrochemical findings by CV, polarization and EIS experiments were found inconsistent. The η% values evaluated from all electrochemical methods were in good agreement and within the range of 93–97% at both pH. Compound 1 was found the most efficient corrosion inhibitor for Cu surface at pH 8.4 with inhibition efficiency upto 97%. Electrochemical responses and data interpretation confirmed that the process involved was charge transfer controlled and inhibitors were mixed type. Adsorption data was found best fit in Langmuir’s adsorption isotherm and indicated spontaneity and stability of the compounds on Cu surface via physiosorption. DFT computational studies further supported the experimental results.

Keywords:

Cu corrosion triazolodiathiazine inhibitors CV potentidynamic polarization EIS DFT 

Notes

ACKNOWLEDGMENTS

Authors are thankful to Dr. Uzma Yunus, Chemistry Department AIOU for donating compounds for corrosion studies.

DISCLOSURE STATEMENT

The authors would like to declare that there is no any established conflict of interest.

ASSOCIATED CONTENT

Supporting Information

Figures S1, S2; as supporting information for this study.

Supplementary material

11124_2019_9150_MOESM1_ESM.pdf (115 kb)
11124_2019_9150_MOESM1_ESM.pdf

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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  • Nasima Arshad
    • 1
    Email author
  • Fouzia Altaf
    • 2
  • Muhammad Akram
    • 1
  • Mehboob Ullah
    • 1
  1. 1.Department of Chemistry, Allama Iqbal Open UniversityIslamabadPakistan
  2. 2.Pakistan Council of Research in Water Resources, Ministry of Science and TechnologyIslamabadPakistan

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