Corrosion aspects of Al and Mg based composites

Abstract

Corrosion is a significant concern in various industries, particularly in applications where metal components are exposed to aggressive environments. Aluminum (Al) and magnesium (Mg) are lightweight metals that find extensive use in aerospace, automotive, and structural applications. However, their susceptibility to corrosion limits their widespread adoption in certain conditions. Metal matrix composites (MMCs) have emerged as a promising solution to enhance the corrosion resistance of these metals while maintaining their desirable mechanical properties. The corrosion resistance of pure Al and Mg is often compromised in harsh environments due to galvanic coupling, electrolyte exposure, and chemical reactions. MMCs, where metal works as a matrix while reinforced by ceramic or hard metallic phases, offer a unique property to tailor a required mechanical property along with suitable corrosion resistance. However, it is challenging to control as well as enhance resistance to corrosion in various corrosive environments. The development of advanced metal matrix composites with tailored corrosion resistance profiles holds the key to expanding the application range of Al and Mg in diverse industries, ensuring their longevity and reliability in corrosive environments. A range of electrochemical techniques, including open circuit potential, electrochemical impedance spectroscopy, and polarization resistance test, highlighting their applications are discussed. © 2026 Elsevier Inc. All rights reserved..