Corrosion in boilers

Corrosion is the reversion of a metal to its ore form. Iron, for example, reverts to oxide as the result of corrosion. The process of corrosion, however is a complex electro chemical reaction and it takes many forms. Corrosion may produce general attach over a large metal surface or it may result in pinpoint penetration of metal. Corrosion is a relevant problem caused by water in boilers. Corrosion can be of widely varying origin and nature due to the action of dissolved  to corrosion currents set up as a result of heterogeneities on metal surfaces, or to the iron being directly attacked by the water.
While basic corrosion in boilers may be primarily due to reaction of the metal with oxygen, other factors such as stresses, acid conditions, and specific chemical corrodents may have an important influence and produce different forms of attack. It is necessary to consider the quantity of the various harmful substances that can be allowed in the boiler water without risk of damage to the boiler. Corrosion may occur in the feed-water system as a result of low pH water and the presence of dissolved oxygen and carbon dioxide.
Starting form these figures, and allowing the amount that can be blown down, the permitted concentration in the make-up water is thus defined.


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