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Chemical and Process Engineering Resources

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Category: Corrosion
Question: How can wet carbon dioxide be responsible for a corrosion problem in iron-containing metals?
Keywords: v1i10,carbon,dioxide,corrosion,co2,scale
Answer: Carbon dioxide reacts with water according to the following equation:CO2 + H2O --> HCO3- + H+As the concentration of CO2 increases, so does the concentration of the H+ ion. This ion can then react with Fe in metals as follows:Fe + 2H+ --> 2H (atom) + Fe2+ As corrosion proceeds, the ferrous ions produced can react with the bicarbonate ions to form ferrous carbonate which precipates as a scale.