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Ted Mooney, P.E. RET
Pine Beach, NJ

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Will residual amounts of CO2 in a closed aqua cooling system lead to corrosion?

Will residual amounts of carbon dioxide in a closed aqua cooling system lead to corrosion. At present molybdate is added as a corrosion inhibitor. Levels are maintained at >100pm as specified by the chemical provider. However, the 304 SS tubes in the heat exchangers within the system are experiencing corrosion. Is there a possible reaction taking place that is leading to this corrosion.

J Joseph
Engineer - Port of Spain, Trinidad
2003

Maintain the pH on the alkaline side. CO2 can produce carbolic acid. Add sodium hydroxide to maintain alkalinity.

Don Baudrand
Consultant - Poulsbo, Washington
(Don is co-author of "Plating on Plastics" [on Amazon or AbeBooks affil links]
and "Plating ABS Plastics" [on Amazon or eBay or AbeBooks affil links])
2003

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