Abstract

To evaluate the impact of carbonate/bicarbonate ions on electrochemical behavior of rebar, the passivation ability and corrosion resistance of a corrosion-resistant 10CrMo rebar were investigated in an alkaline solution enriched with calcium hydroxide and two simulated carbonated concrete pore solutions with carbonate/bicarbonate ions of low content (LCS solution) and high content (HCS solution). As confirmed by the results of electrochemical measurements, the formation of protective passive films was suppressed by carbonate/bicarbonate ions, particularly evident in the HCS solution. Consequently, the less protective passive films of rebar in carbonated solutions resulted in the lower corrosion resistance to chloride attack. However, under the condition of elevated chloride content, carbonate/bicarbonate ions in the HCS solution demonstrated a mitigating effect on the pitting corrosion of 10CrMo rebar.

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