Improving the corrosion behaviour of Zn-Ni alloy coatings on 316 SS from chloride-sulfate bath by addition of triethanolamine or sucrose

Original scientific paper

Authors

  • Mothana Ghazi Kadhim Alfalah Materials of Engineering Department, College of Engineering, University of Al-Qadisiyah, Al-Diwaniyah, Iraq https://orcid.org/0000-0002-8970-712X
  • Ali H. Abbar Department of Biochemical Engineering, Al-Khwarizmi College of Engineering, University of Baghdad, Baghdad, Iraq https://orcid.org/0000-0003-4090-9254
  • Fatma Kandemirli Department of Biomedical Engineering, Faculty of Engineering and Architecture, Kastamonu University, Turkey https://orcid.org/0000-0001-6097-2184

DOI:

https://doi.org/10.5599/jese.2607

Keywords:

Corrosion resistance, Zn-Ni alloy, Electrodepositing, Triethanolamine, Sucrose, SEM

Abstract

Corrosion of Zn-Ni alloy coatings on stainless steel 316 SS in a chloride-sulfate bath with the addition of either triethanolamine or sucrose was examined. A constant cathode potential was used to deposit zinc-nickel alloys, while cyclic voltammetry and potentio-dynamic polarization were used to measure corrosion. In addition, scanning electron microscopy was utilized to analyse Zn-Ni alloy coating surface layers formed with¬out and with additives. The outcomes discovered that the corrosion resistance of Zn-Ni alloy coat¬ings in 3.5 % NaCl solution was highly influenced by adding triethanolamine or sucrose. Decreasing the Zn:Ni molar ratio led to an increase in corrosion resistance. All Zn-Ni alloy coatings were superior to pure Zn coating in their corrosion behaviour. The best result was found for potentiostatic electrodeposition of Zn-Ni alloy at the cathodic potential of -1.3 V vs. Ag/AgCl for 20 minutes in the presence of 0.335 M triethanolamine from a solution containing 0.02 M ZnCl2, 0.1 M NiSO4, 0.4 M H3BO4 and 1 M Na2SO4. For this Zn-Ni coating, a low corrosion rate of 0.00795 mm year-1 was observed at Ecorr = -0.5 V vs. Ag/AgCl and icorr= 0.535 µA cm-2. Scanning electron microscopy confirmed that this alloy has a granular structure with no cracks and a less porous structure. The new Zn-Ni alloy is superior in its properties in terms of corrosion resistance compared with those obtained in previous studies.

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Published

02-04-2025

Issue

Vol. 15 No. 3 (2025)

Section

Corrosion

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Copyright (c) 2025 Mothana Ghazi Kadhim Alfalah, Ali H. Abbar, Fatma Kandemirli

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How to Cite

Improving the corrosion behaviour of Zn-Ni alloy coatings on 316 SS from chloride-sulfate bath by addition of triethanolamine or sucrose: Original scientific paper. (2025). Journal of Electrochemical Science and Engineering, 15(3), 2607. https://doi.org/10.5599/jese.2607

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