Rectangular test specimens of different alloys with 50 × 20 × 2 mm in dimension were utilized in the experimental work. Carbon steel (G1010 and 1020), Austenitic stainless steel (AISI 304, and 316l SS), copper based alloys (90/10 Cu/Ni and 70/30 Cu/Ni) and nickel based alloys (Incoloy 825 and Inconel 625) were used during the experiments. The chemical compositions of the alloys are given in Table (1). The specimens were exposed to seawater under different levels (above seawater level, semi-submerged and immersed fully in seawater). Figure 1 shows the schematic diagram of the experimental set-up. The seawater flow was kept very low (12/lit/hrs) at room temperature. Weight loss coupon method technique had been used to determine the corrosion rates. The test specimens were abraded on 400 grit SiC paper.