A review of corrosion and environmentally assisted cracking of Mg-Li alloys

Abstract

• A review of EAC mechanisms in Mg-Li alloys is provided, focusing on anodic dissolution and hydrogen embrittlement. • Key factors influencing the initiation and propagation of EAC are analyzed. • Mitigation strategies including alloying, heat treatments, and surface coatings are summarized. • Existing challenges and future research directions on coatings, corrosion inhibitors, and mechano-chemical effects are discussed. Mg-Li alloys hold significant potential for applications in aerospace, automotive manufacturing, military weaponry, and biomedical implants, due to their excellent recyclability, high specific strength, biocompatibility, and superior electromagnetic shielding properties. However, their poor corrosion resistance and high susceptibility to environmentally assisted cracking (EAC) significantly limit broader application. In recent years, growing attention has been directed toward understanding the corrosion and EAC behavior of Mg-Li alloys, as localized corrosion areas and hydrogen generated during the corrosion process can serve as crack initiation points and promote crack propagation. A comprehensive understanding of these mechanisms is essential for enhancing the reliability and performance of Mg-Li alloys in practical environments. This paper presents a detailed review of corrosion and EAC in Mg-Li alloys, focusing on corrosion behavior, crack initiation and propagation mechanisms, and the key factors influencing these processes. It summarizes recent advances in alloying, heat treatment, mechanical processing, microstructural control, environmental influences, mechanical loading, and surface treatments. In addition, the paper explores future research directions, highlights emerging trends, and proposes strategies to improve the durability and service performance of Mg-Li alloys.

Topics & Concepts