Understanding Electrochemical Behavior and Localized Corrosion Susceptibility in Cold Sprayed Al-Mg Binary Deposits with Varying Mg Contents

This paper elucidates electrochemical behavior and localized corrosion susceptibility in cold sprayed Al-Mg binary deposits with varying Mg content. Cold spray (CS) deposition is a solid-state deposition process, being investigated as protective layers and repair applications. Nevertheless, a lack of understanding of corrosion mechanisms in CS deposits is prevalent due to its complex microstructure-driven mechanisms different from wrought counterparts. Analytical electrochemistry techniques, including potentiodynamic polarization and Mott-Schottky testing showed that corrosion resistance increased with increased Mg content in CS Al-Mg binary deposits. However, immersion tests (50 h) demonstrated that the effect of Mg content on localized corrosion damage was insignificant compared to that of prior particle boundaries that primarily governed localized corrosion initiation and propagation.