Chemical treatment of heat transfer medium to prevent corrosion under conditions of the zinc coating polarity reversal in hot water supply systems

Summary

While operating galvanized main pipelines in hot water supply systems, problems associated with accelerated pipe corrosion arise. Under normal operating conditions, the zinc coating is anodic and provides for both mechanical and electrochemical steel protection. Zinc coating damage or presence of pores in it do not cause steel corrosion, but rather expedite destruction of the coating itself. Changing environmental conditions can cause a polarity shift in the zinc coating resulting in the increased steel dissipation in pores, cracks, and scratches. Possible using chemical treatment of the heat transfer agent to prevent corrosion under conditions of polarity shifts in the zinc coating of pipes is discussed.

Key words

reagent treatment , water treatment , hot water supply system , zinc coatings , scale inhibitor , corrosion rate , zinc plated steel