When the concrete is finished being cast in place, the condition of the concrete is in a very alkaline condition, it can reach 12.5, in this very alkaline condition the potential for corrosion becomes small, because there is a passive layer that protects the concrete from rust. Environmental factors and the age of the concrete can make the passive layer on the steel bar disappear, so the potential for rust on the steel bar is greater. When rust begins to occur, the area becomes anodic and releases iron ions on the steel rebar in the electric cell, while the unrusted steel rebar is cathodic, at this point hydrooxide is formed. When hydrooxide meets iron, FeOH iron hydroxide is formed, or oxidation which over time will turn into rust The whole process of releasing iron ions until the occurrence of rust is called the electrochemical corrosion process When the rebar starts to rust, its volume will increase to up to 4 times its original size, so it will push against the concrete blanket, causing the concrete to crack and possibly concrete spalling. if the concrete has spalled due to the enlargement of the steel rebar, it is a sign that the concrete structure is not functioning as it was designed, so it must be repaired immediately because the concrete structure has the potential to collapse, so it is very dangerous if the structure is still functioning. Concrete repairs will be very costly, potentially causing other major losses when the temporary building structure cannot be used due to the repair process. So the question of why steel rebar rust protection is needed in concrete structures, resulting in concrete spalling, is to avoid: large repair costs, avoid potential greater losses, potential injury and even death caused by collapsing concrete structures. Cortec MCI (Migratory Corrosion Inhibitor) provides rust protection technology on steel bars, so that concrete structures have a longer durability, are safe from avoiding repair costs and other larger financial losses. For more information regarding solutions from Cortec, click on the product bar>corrosion inhibitor