The additive-manufactured stainless steel 17-4 precipitate hardened (PH), produced with powder bed fusion (PBF), results in austenite and martensite structures, which are utilized in various industries and marine sectors. Therefore, studying the corrosion behavior and its impact on post-processing is crucial. The present study unveils the effect of post-processing techniques on PBF SS 17-4 PH samples’ corrosion behavior, comparing them with wrought material. Specifically, the study investigates the decrease in corrosion rate achieved by minimizing surface roughness through post-processing techniques. The comparison of electrochemical potential values for as-built, sandblasted, and ultrasonically tested SS 17-4 PH samples was conducted. A series of electrochemical potential tests were performed in a 3.5% wt NaCl solution to evaluate the microstructural effect on pitting behavior. The test samples were subjected to examination under an optical microscope and a scanning electron microscope. The results showed that the as-built samples exhibited high concentration of pores compared to the post-processed samples, indicating less corrosion resistance due to unsintered particles. Among the post-processed samples, the ultrasonically processed samples demonstrated higher corrosion resistance potential than the sandblasted samples.