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CORROSIVE ATTACK OF CORBON DIOXIDE IN BOILERS

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CORROSIVE ATTACK OF CORBON DIOXIDE IN BOILERS

The most often encountered condensate system corrosion in boilers is caused by carbon dioxide
  1.  The dissolved gases normally present in water cause many corrosion problems. Carbon dioxide exists in aqueous solutions and as the combine forms of carbonate and bicarbonate ions.
  2.  Carbon dioxide dissolves in water & produces corrosive carbonic acid. The low pH resulting from this reaction a enhances the corrosive effect of oxygen.                                                                                                                                                       CO2 + H2O ——> H2CO3
  3.  Heating the feed water and maintaining it at a high temperature prior to its delivery to the boiler can drive off carbon dioxide.
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