Carbon dioxide attack in boilers
Carbon dioxide attack
Carbon dioxide exists in aqueous solutions as free carbon dioxide and the combine forms of carbonate and bicarbonate ions. Corrosion is the principal effect of dissolved carbon dioxide. The gas will dissolve in water, producing corrosive carbonic acid:
H2O + CO2 çè H2CO3 çè H+ + HCO3-
The low pH resulting from this reaction also enhances the corrosive effect of oxygen.
Carbon dioxide corrosion is frequently encountered in condensate systems and less commonly in water distribution systems.
| Find information about the main problems occurring in boilers: scaling, foaming and priming, and corrosion. |
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Check also our web page about boiler feed water and boiler water treatment, in particular through deaeration (deaerating heaters or membrane contractors).