Steel rebar members used in reinforced concrete pillars. They do not come directly in contact with Oxygen and water so why do they corrode.
carbonation and the presence of chloride ions can contribute to corrosion even without direct exposure to oxygen and water.
Corrosion of steel rebar in concrete can be caused by the ingress of chloride ions from external sources, such as seawater or de-icing salt. FeCl2 is much stronger than Fe and is also used as a good reinforcement. These ions can reach the steel even in the absence of direct contact with oxygen and water, causing rust. Additionally, carbonation of concrete can lower its pH, making the environment more favorable for steel corrosion.
Exposure of reinforced concrete to chloride ions is the primary cause of premature corrosion of steel reinforcement .
The corrosion of steel rebar in concrete pillars occurs due to the presence of chloride ions, carbonation, or a combination of both.
steel corrosion occur, if oxygen and moisture are available to sustain the reaction.
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