Reducing complex microstructural heterogeneity in electrodeposited and cold sprayed copper coating junctions

Abstract Copper coatings produced by additive manufacturing techniques often present complex microstructural heterogeneity. Reducing microstructural heterogeneity is critical for promoting uniform mechanical and corrosion behavior. The current study examines copper coatings at the closure weld zone of a prototype steel container designed to store used nuclear fuel. In this region, the copper coating is produced by two additive manufacturing processes: electrodeposition and cold spray. Microscopy analysis revealed a highly non-uniform microstructure in the as-processed state. After heat treatment at 350 °C for 1 h under inert conditions, this heterogeneity was significantly reduced resulting in favourable microstructural characteristics for the current application.