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The corrosive destruction of steel as material of maritime infrastructure had been investigated using simulated wet-dry test, loss weight, energy dispersive X-Ray spectroscopy (EDS) and X-ray diffraction (XRD) in seawater solutions of Muara Baru,Jakarta; Karangsong and Eretan regions, Indramayu. Controlled solution used as the comparison of natural seawater are 3,5% NaCl and 5% NaCl. The results shows that uniform corrosion took place on carbon steel after the exposure. The resistance of corrosion increases rapidly on the first 7 days, then decreases with increasing exposure time. The effect of conductivity, salinity and total dissolve solids (TDS) of test solutions for steel corrosion process was almost same at each interval of exposure time. The decrease of dissolved oxygen (DO) enhances corrosion rate on the first 7 days, which indicated the formation of oxide layer as the further barrier of corrosion process. The role of high concentration for chloride ion increases corrosion rate after 7 days of exposure time, which interfere the forming of stable oxide layer on the metal surface. That interference induces corrosion rate tends to increase again. The compound of γ FeO(OH) (Lepidrococite) formed as predominant corrosion product.