Due to wide spread use of steel and galvanized steelin Indonesia, it isimportant to study corrosionbehavior of these materials in marine environments. Thus, corrosion performance of those materials was conducted in Karangsong and Limbangan. Since, the surface data was not available in the literature. Those materials were immersed in sea water for 27 days. The corrosion measurement was conducted by weight loss. Sea water parameter such as temperature, pH, salinity, DO (Dissolved Oxygen), and conductivity were measured. SEM-EDS was conducted to see corrosion morphology. The results showedthat mild steel was more corroded than galvanized steel in both seawaterenvironments. Corrosion rate of mild steel and galvanized steel in the Karangsong sea water were 29.5 and 8.4 mpy respectively, and corrosion rate of mild steel and galvanized steel in Limbangan sea water were 25.5 and 7.6 mpy respectively.
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