In alkaline environment, chlorides can occasionally cause openings in steel’s passivation layer.

This effect generates random corrosion episodes known as “pitting corrosion”. This is the anion of the electrolytic reaction that corrosion entails and penetrates the steel bar.

Although “pitting corrosion” has seldom resulted in breaking a slab’s reinforcement bar, a certain loss in the ability to support the load is inevitable in any case.