This work focuses on the effect of flow velocity on the corrosion performance of Thermal Spray Aluminium (TSA) Coating obtained by twin-wire arc spraying. Cylindrical electrodes (12 mm diameter) were machined from an S355 steel rod and coated with 300 µm thick TSA (AA 1050). An analytical rotator was employed for testing the coupons at 50 rpm and 600 rpm for 10 d in synthetic seawater. Testing under stagnant conditions was also included. Open Circuit Potential (OCP) and Linear Polarisation Resistance (LPR) measurements were carried out at 18 ±2 °C to assess the flow velocity effect and calculate the corrosion rate. Within 5 days of immersion, the OCP became more positive at higher rotation speeds. White corrosion products and calcareous deposits were observed on the coupon surfaces after 5 days, and the corrosion rate decreased in all cases.