The natural corrosion that toronto boilers have in the water varies with the impurities found in the raw water supply. One common indicator of corrosiveness is the level of pH. The more acidic the pH, the more corrosive the water. Other factors that can affect the corrosiveness of water are the quantity of dissolved minerals and gases, temperature, and velocity.
The various types of corrosion can be identified by examining the metal surface of the cooling or boiler system:
General corrosion is a uniform attack of a metal surface.
Galvanic corrosion occurs when two dissimilar metals or alloys are connected and exposed to a corrosive environment.
Pitting corrosion, or oxygen pitting, is a randomly occurring, highly localized form of attack on the metal surface and often is most destructive to the boiler or cooling system.
Erosion corrosion occurs when flow rates are excessive; the metal surface actually is worn away.
Corrosion also can be the result of micro biological organisms such as bacteria, fungus, and algae. The growth of micro biological organisms in industrial and commercial cooling systems also can foul heat exchangers and cause odor problems.