The concrete cover protects of the reinforcement against corrosion, there are several corrosion conditions in structures at Tripoli area, Sea water are using in make concrete mixture. [1,2] Sea water and local aggregate were used Reinforced concrete specimens were prepared with different water to cement ratios as well as with different concrete covers. Specimens (cubes and beams) have exposed to outdoor (Av. Relative humidity 50%) and climatic chamber (Av. Relative humidity 85%) environment. Electrochemical behavior of the specimens was monitoring for two years for both environments. [3] Results have showed that. Water- cement ratio and concrete cover have a significant effect on corrosion rate for specimens mixed with sea water for both exposure conditions.