Effect of Solid Solution Time on Microstructure and Corrosion Property of Wire Arc Additively Manufactured 2319 Aluminum Alloy

2319 aluminum alloy was prepared using wire arc additive manufacturing (WAAM) technique. The solid solution time of achieving improving corrosion resistance in WAAM 2319 aluminum alloy was investigated. The results indicated that the as deposited 2319 aluminum alloy was composed of dendritic grains. Numerous inter-granular intermetallic were continuously distributed along the grain boundary. As the solid solution time increased, the inter-granular intermetallic gradually dissolved into α-Al matrix resulting in discontinuously distribution and more homogeneous element distribution. Electrochemical experiment results indicated that the corrosion potential of WAAM 2319 aluminum alloy gradually increased with the increase of solid solution time. This indicated that increasing solid solution time could effectively increased the corrosion resistance of WAAM 2319 aluminum alloy. Improved corrosion resistance can be attributed to refined and discontinuous inter-granular intermetallic.