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Concrete is a popular material used in constructions such as building, bridge, harbor, etc. The microstructural state of concrete shows that the material has a lot of pores which allows the aggressive substances in the marine environment, such as chloride, infiltrate into the concrete and cause corrosion in the reinforcing steel. If cracks occur on reinforced concrete beams due to the overstress in concrete, it will increase the infiltration rate of aggressive substances and accelerate the corrosion. In the long term, it can reduce the load capacity, the resilience of the structure and lead to progressive damage even spalling on the concrete cover. This research focused on investigating the flexural capacity of the reinforced concrete beam. The beams were pre-cracked to produce cracks and the accelerated corrosion test was used to initiate the corrosion process. The accelerated corrosion test used a constant current of 0.1 A with 3.5% salt water to simulate the marine environment. Finally, the changes of flexural capacity were evaluated in this study to obtain the effect of marine exposure to the flexural behavior of the structure. From the results show that beam flexural capacity decreased by 23% with a corrosion rate of 14%.