Insights into the role of Cerium-based inhibitor in improving the anti-corrosion performance of ZnAl alloy coated carbon steel substrate

Anh Son Nguyen; Thu Thuy Pham; Thuy Duong Nguyen; Thi Vy Anh Vuong; Thi Thu Trang Nguyen

doi:10.15625/0868-3166/23691

Author affiliations

Authors

Anh Son Nguyen Institute of Materials Science https://orcid.org/0000-0002-7221-3369
Thu Thuy Pham Faculty of Chemical and Environmental Technology
Thuy Duong Nguyen Institute of Materials Science
Thi Vy Anh Vuong Institute of Materials Science
Thi Thu Trang Nguyen Institute of Materials Science

DOI:

https://doi.org/10.15625/0868-3166/23691

Keywords:

ZnAl coating, electrochemical techniques, cerium inhibitor, corrosion

Abstract

This study quantitatively investigates the physicochemical evolution of protective layers on ZnAl alloy coated carbon steel, focusing on the inhibitory performance of cerium-based compounds Ce(NO₃)₃ in a chloride medium. A combination of electrochemical techniques, Open Circuit Potential monitoring, Potentiodynamic Polarization and Electrochemical Impedance Spectroscopy, was employed to demonstrate the addition of Ce³⁺ions significantly enhances corrosion resistance. For the uninhibited solution, EIS modeling consistently revealed a continuous increase in capacitive elements and a drastic decline in resistive elements. signifying physical barrier breakdown. The optimal concentration, 10^-4 M, fostered the growth of a stable, progressively densifying Ce-enriched layer. This layer maintained high R_ct (up to 8553 Ω.cm²), confirming its superior physical barrier integrity. Surface morphology analysis using Scanning Electron Microscopy corroborated this finding, revealing the formation of a homogeneous, crack-free cerium containing film structure at this optimal concentration. Conversely, the 5×10^-4 M concentration led to long-term failure, attributed to the formation of a mechanically weak, heterogeneous outer deposit prone to cracking. These findings quantitatively establish the relationship between cerium concentration, the resulting film's physical structure, and its long-term anti-corrosion durability.

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