20.500.12556/DiRROS-22072 Comparative electrochemical and thermodynamic study of cold-rolled steel, Al alloy AA5754, and Zn corrosion in fluoride and chloride solutions This study investigates the effects of fluoride and chloride ions on the corrosion of cold-rolled steel, aluminium alloy AA5754, and zinc, using ammonium bicarbonate as a buffer at pH 4 and compares electrochemical findings with thermodynamic calculations of E-pH diagrams. The distinct electrochemical behaviours of fluoride and chloride ions were confirmed, with fluoride-induced corrosion leading to the significant complex formation on cold-rolled steel and AA5754, the latter leading to a narrowing of the Al passive region. However, a comprehensive analysis of all ionic species in the solution (F−, Cl−, NH4+ and HCO3−) and their complex equilibria reveals that zinc's corrosion is primarily influenced by the overall ionic strength of the solution and further complexation with the buffering agent at higher pH levels, should these conditions occur during corrosion. In addition, this analysis also highlights the subtle differences in the stabilization effects of open circuit potential on cold-rolled steel and AA5754. The results underscore the importance of considering the overall solution equilibrium in thermodynamic analyses and provide a foundation for further research on the role of F- and Cl- ions in zirconium conversion coatings. bicarbonate pitting complexation true false true Elsevier Nizozemska Angleški jezik Ni določen © 2024 The Authors. Neznano 2025-04-18 14:36:18 2025-04-18 14:36:18 2025-10-24 03:50:29 0000-00-00 00:00:00 2024 0 0 Nasl. z nasl. zaslona; Opis vira z dne 9. 8. 2024; str. 1-15 Vol. 502, [article no.] 144819 Oct. 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2024-04-01 2024-08-01 2024-08-02 54 1873-3859 10.1016/j.electacta.2024.144819 204006403 https://www.sciencedirect.com/science/article/pii/S0013468624010594?via%3Dihub 1 bab48d0f-1c51-11f0-963a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=31889 RAZ_Kras_Ana_2024.pdf RAZ_Kras_Ana_2024.pdf 1 0894AEBC6C66854B0F8FE3FEBC00320C e8498fcd154838b1230a498cc39103b5910fcc2522e7604405d3151dca22a0fe 912eba2c-1c52-11f0-963a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=31891 Institut Jožef Stefan 0 0 0