The corrosion of steel reinforcement in concrete has been a concern in recent years as durability has become more important in concrete structures. Particularly, chloride-induced corrosion of reinforcing steel is increasingly important in many countries due to the increasing use either sea sand and seawater for heavy construction of marine structures. Several protection techniques have been developed including the utilization of Supplementary Cementitious Materials (SCMs) to increase corrosion resistance from chloride attack. The corrosion behavior of steel bar was investigated through electrochemical techniques at W/B ratios of 0.4, 0.5 and 0.6 with the effectiveness SCMs such as fly ash, silica fume, metakaolin and blast furnace slag in chloride contaminated mortar. This paper focuses on electrochemical properties of steel bar embedded in cement hardened matrix during early age until 9-months. The result showed, SCMs remarkable performance against corrosion, but different rates depending on their binder type. Further, BBMKP is more effective on electrochemical and durability performance.