Comparative Analysis of Cystine and Cysteine as Green Corrosion Inhibitors of Aluminium Alloy AA7075-T6

Authors

  • Jovanka Pejic Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia https://orcid.org/0000-0002-3494-9180
  • Dunja Marunkić Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia https://orcid.org/0000-0001-9519-0342
  • Aleksandar Jovanović Institute for Technology of Nuclear and Other Mineral Raw Materials, Boulevard Franše d’Eperea 86, 11000 Belgrade, Serbia https://orcid.org/0000-0001-9867-9282
  • Nikola Vuković Institute for Technology of Nuclear and Other Mineral Raw Materials, Boulevard Franše d’Eperea 86, 11000 Belgrade, Serbia https://orcid.org/0000-0002-3607-5907
  • Bojana Radojković Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia https://orcid.org/0000-0003-3111-0264

DOI:

https://doi.org/10.30544/MMD43

Abstract

Cystine and cysteine as green corrosion inhibitors of the 7075 aluminium alloy in 0.1 M NaCl solution were analysed and compared. The inhibitive efficiency of the inhibitors was analysed by applying linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) methods. Different concentrations of both inhibitors in NaCl solution were tested under different temperatures and times to determine the corrosion kinetic and thermodynamic parameters. Optical microscopy (OM) and scanning electron microscopy (SEM) were used for analysis of the aluminium alloy surface before and after the electrochemical measurements. The hydrophilicity of the alloy surface with tested inhibitors was compared by applying contact angle measurements. The results showed that cystine and cysteine are effective corrosion inhibitors, with different characteristics and duration of protection on the tested aluminium alloy. Cysteine showed better efficiency for short-term applications while cystine provided more stable protection over a longer period.

Keywords:

aluminium alloys, AA7075, green corrosion inhibitors, EIS, SEM/EDS
Supporting Agencies
This study was financially supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia (Grant No. 451-03-47/2023-01/200026 and 451-03-66/2024-03/200023)

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cystine and cysteine as green corrosion inhibitors

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Published

11-03-2025

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Vol. 2 No. 4 (2024): Statistics and Data in Materials Science and Metallurgy

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Research Paper

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Copyright (c) 2025 Jovanka Pejic, Dunja Marunkić, Aleksandar Jovanović, Nikola Vuković, Bojana Radojković

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