Protective treatment for microchannel dry coils: Kaltra

08 April 2020

Kaltra advances in creating protective treatments for microchannel heat exchangers and introduces new anti-corrosion coating for dry (fluid) coils to apply to inner surfaces. The new coating enables for an expanded range of process water pH value, a measure of how acidic/basic water is. 

The typical pH range for microchannel heat exchangers is 6.0 to 8.5 to prevent corrosion of the aluminum.

Controlling the pH within the desired range is critical for controlling aluminum corrosion. Therefore, it is desirable to maintain the pH near the high end (8.5) to accommodate all the metallurgy of a water system. New chemical treatment of inner surfaces presented by Kaltra allows extending the safe pH range, thus contributing to the corrosion resistance not only of microchannel coils but also the water system as a whole.

Kaltra also recommends a well-proven mechanism of corrosion inhibition of aluminum alloys by sodium molybdate. In a concentration of about 20mM, sodium molybdate (Na2MoO4) demonstrates excellent inhibition efficiency for aluminum alloys used in the manufacturing of microchannel heat exchanger coils.

Kaltra offers customers the benefits of extended coil service life in a wide range of environments and processes water qualities.

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