This work aims to investigate the corrosion properties of CFRP/Steel (carbon fiber reinforced plastic) and CFRP/Al SPR (self-piercing riveting) joints by an Almac^®-coated steel rivet. The corrosion behavior of all samples was evaluated by open-circuit potential and potentio-dynamic polarization tests in 3.5 wt% NaCl solution. Meanwhile, the samples were exposed to continuous a salt spray test up to 90 days. Furthermore, single-lap shear tests were carried out in order to assess the mechanical performance of these SPR joints before and after the salt spray test. The results show that the lap shear strength of the CFRP/Steel SPR joints was decreased drastically as a function of increasing exposure time, whereas the strength of CFRP/Al SPR joints remained relatively unaffected for the entire exposure time. It is also observed that the Almac^®-coated steel rivet in the CFRP/Steel SPR joint was affected by severe galvanic and/or crevice corrosion as a result of the rivet head deterioration as the exposure time increased. On the other hand, the Al sheet of CFRP/Al SPR joint experienced noticeable pitting corrosion.