In this work, peel tests were used to assess the adhesion quality between carbon fiber reinforced polymers (CFRP) and carbon steel plates. The tests were performed according to the ASTM standard of floating roller peel tests (D3167–97) with a new specimen layup. The layup and geometry of specimens was defined in order to have the CFRP as the rigid substrate and the steel plate as a flexible substrate. The aim is to assess the adhesion quality of the interface in dry-conditions (short-term) and after ageing (long term). Specimens were inside the salt spray cabinet for 30 days to absorb the moisture. Results show that peel load are not significantly affected by the ageing condition. The specimens tested at dry-conditions and ageing condition showed a cohesive failure within the adhesive layer, which indicates a good adhesion between the CFRP-Steel interfaces. Long term durability is suggested by keeping the specimen for longer duration in order to observe the degraded trend and adhesion quality of the joints.