Electrochemical behavior of mild steel in concrete: Influence of pH and carbonate content of concrete pore solution

Corrosion Resistance of Mild Steel in Simulated Concrete Pore Solution

“…However, the passive film can be locally damaged and the localized corrosion of reinforcing steel takes place when pH and/or the chloride concentration at the steel/concrete interface reach the critical values for corrosion [4][5][6][7][8][9] . The pH of concrete pore solution decreased during concrete carbonation due to the neutralization of Ca(OH) 2 in the interstitial solution with the acidic gases (CO 2 , SO 2 , etc.)…”

“…The pH of concrete pore solution decreased during concrete carbonation due to the neutralization of Ca(OH) 2 in the interstitial solution with the acidic gases (CO 2 , SO 2 , etc.) which diffuse into the steel/concrete interface from the air 8 . The pH value of concrete pore solution is one of the most important parameters affecting the corrosion behaviour of reinforcing steel in concrete.…”

“…In spite of the extensive studies of corrosion behaviours of reinforcing steel [4][5][6][7][8][9][10] , the exact mechanism of its depassivation is still unclear. Even though the effect of pH on the corrosion of reinforcing steel was discovered decades ago, there were only a few studies focusing on the depassivation of the steel caused by decreasing pH of concrete pore solution during the carbonation process 8,[11][12][13] .…”

“…Even though the effect of pH on the corrosion of reinforcing steel was discovered decades ago, there were only a few studies focusing on the depassivation of the steel caused by decreasing pH of concrete pore solution during the carbonation process 8,[11][12][13] . In the urban and industrial areas, the acidic gases (CO 2 , SO 2 , NO 2 , etc.)…”

Contribution to the French program dedicated to cementitious and clayey materials behavior in the context of Intermediate Level Waste management – Hydrogen transfer and materials durability

“…Passivity has been pointed out for steel embedded in mortars exposed to different relative humidities (until 5 years) and a solution representative of a clayey geological layer [13]. In aerated conditions, depassivation of steel can occurs at pH between 10 and 9.4 depending on chemical species in solution (sulphates, silicates and carbonates) [14] (Figure 5b). Fig.…”