Corrosion mechanisms of steel reinforcement in concrete

TL;DRAbstract

Two models are discussed in which chloride ion concentration gradients form in steel reinforced concrete structures. Electrochemical testing to compare the models was conducted. Plain carbon steel specimens were exposed in a simulated concrete environment of saturated calcium hydroxide solution with different but uniform concentrations of sodium chloride. The different increasing chloride ion concentrations promoted open circuit potential decreases with reference to a saturated calomel electrode. These potential shifts may lead to galvanic corrosion effects depending on both the average chloride ion concentration and the presence of chloride ion concentration gradients. Calicium nitrite, a corrosion inhibitor was added to simulated concrete solution. It was found the presence of calcium nitrite decreased, or in some cases eliminated the potential shifts associated with different chloride ion concentrations in solution, thereby, greatly reducing or eliminating the possibility of galvani

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