Anwar, Shams, Qamar, Sanaullah, Bashir, Shahzad, Shahgaldi, Samaneh et Li, Xianguo. 2025. « Influence of pH and saline exposure on Zn-Ni coating degradation: Insights from numerical simulations ». Communication lors de la conférence : CSME-CFDSC-CSR 2025 International Congress (Montreal, QC, Canada, May 25-28, 2025).
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Résumé
Corrosion-induced failures pose significant safety and economic challenges, particularly in automotive applications, where exposure to aggressive environments accelerates material degradation. Zinc-nickel (Zn-Ni) alloy coatings have gained prominence as an eco-friendly alternative to cadmium-based coatings due to their superior electrochemical performance, mechanical integrity, and enhanced corrosion resistance. Compared to pure Zn coatings, Zn-based alloys offer improved protection by forming a stable passive layer that mitigates localized corrosion, making them highly suitable for harsh conditions. This study investigates the mechanisms governing pit propagation in Zn-Ni electroplated 316L stainless steel surfaces through numerical modelling of single and double pits. Simulations were conducted using COMSOL Multiphysics 6.2 with the Tertiary Current Distribution, Nernst-Planck interface to analyze electrode kinetics, mass transport, and geometric deformation in a 0.35 mol/L NaCl solution at pH 3.0 and 7.0 over an eight-hour exposure period. The results indicate that single pits in an acidic environment exhibited an electrode potential of - 0.897 V vs. RHE and a total electrode thickness change (pit depth) of 2.89 ?m, which is significantly higher than the -0.777 V vs. RHE and 0.845 ?m observed at neutral pH. Similarly, two-pit configurations in acidic conditions demonstrated more severe degradation, with an electrode potential of -0.946 V vs. RHE and a thickness change of 4.10 ?m, compared to -0.814 V vs. RHE and 1.709 ?m at pH 7.0. These findings highlight the critical role of substrate penetration in accelerating localized corrosion, emphasizing that acidic conditions significantly enhance the severity of pit growth. The study underscores the necessity of optimizing Zn-Ni alloy coatings to enhance pitting resistance, prolong service life, and improve the durability of components exposed to saline environments. These insights contribute to the advancement of protective strategies, ensuring long-term material performance and structural integrity in critical infrastructure applications.
| Type de document: | Communication (Communication) |
|---|---|
| Informations complémentaires: | Progress in Canadian Mechanical Engineering, Volume 8. Co-chairs: Lucas A. Hof, Giuseppe Di Labbio, Antoine Tahan, Marlène Sanjosé, Sébastien Lalonde and Nicole R. Demarquette. |
| Date de dépôt: | 18 déc. 2025 14:37 |
| Dernière modification: | 18 déc. 2025 14:37 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32128 |
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