Aluminum dross has a low aluminum metal content, so it may be served in making concrete. The addition of aluminum dross is expected to improve the concrete passive layer, contributing to corrosion control. This research investigates corrosion behavior of reinforced bar embedded in concrete with aluminum-added in the immerse condition by seawater. The impact of chloride ion exposure on the reinforced bar will be characterized by electrochemical impedance spectroscopy and potentiodynamic polarization. The microstructure evolution due to time exposure and chloride ion content could be explored by scanning electron microscope. Corrosion resistance on the reinforced bar tends to increase with aluminum dross presence. The consequences demonstrate the significant influence of aluminum dross on the passivation area and corrosion behavior of concrete.