Corrosion behavior of high-performance crystalline CuCrZr/amorphous CuZrAl composites in NaCl solution

Abstract

The corrosion mechanism of Cu-based crystalline/amorphous composites in NaCl solution is investigated. xCuCrZr/(1–x)CuZrAl (x = 10, 50, 90 wt%) crystalline/amorphous composites with excellent interfacial bonding are fabricated by ball milling and spark plasma sintering (SPS) processes. According to the findings of electrochemical testing and immersion experiments, composites containing 50% amorphous CuZrAl exhibit the lowest corrosion rate. In-depth behavioral analysis reveals that uniform corrosion dominates the crystalline CuCrZr phase, while pitting corrosion dominates the amorphous CuZrAl phase. The corrosion model of the composites is constructed to disclose corrosion processes at various phases as well as the kinetic mechanisms that govern individuals.