The use of electrochemical impedance spectroscopy (EIS) method, Nyquist plots, and Bode impedance module plots of coral aggregate seawater concrete (CASC) at different exposure times in a seawater immersion environment was tested. The most suitable equivalent electric circuit (EEC) for fitting reinforcement corrosion of CASC in a seawater immersion environment was investigated. The reinforcement corrosion electrochemical parameters were calculated. The factors affecting reinforcement corrosion of CASC were researched. The results showed that in order to reduce reinforcement corrosion risk, the concrete cover thickness should be thicker than 5.5 cm. As exposure time increased, the decrease rate of anticorrosion effectiveness for the calcium nitrate inhibitor was higher than that for the amino alcohol inhibitor. Corrosion resistance would improve if the inhibitor was preabsorbed. Corrosion resistance of different types of reinforcements followed the rule: 2205 duplex stainless steel > 316 stainless steel > new organic coated steel > zinc–chromium coated steel > common steel.
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