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topic 8470

Zinc Ammonium Chloride Solution Heating


I am a consultant working for a hot-dip galvanizing facility on some process improvements. The main concern is the temperature of the zinc ammonium chloride preflux tank. The desired tank temperature is 160 F; heating water is available at 190 F. The ONLY metallic material the owner has found that withstands this solution is AL6XN stainless steel. Unfortunately, the low temperature differential results in a lot of heat exchange area. Since AL6XN seems to only be available as tube stock, this results in an inordinate amount of serpentine (bent tube) heat exchange coils. Plastic coils would withstand the solution (the tank itself is PP) but again result in a huge amount of heat exchange area due to poorer thermal conductivity of plastic as opposed to metallic materials.

How have other companies avoided this problem? Any help would be appreciated.

Stephen Angstadt
- Leesport, Pennsylvania, USA


We are working with a local galvanizer who swears by plate and frame heat exchangers with Alloy C-22 plates for heating zinc ammonium chloride solution.

The heat exchanger is piped outside the tank and the solution recirculated with a plastic pump.
These units are available from at least one major plate and frame heat exchanger manufacturer.

Manny Hotchkiss, P.E.
manufacturers - Beaverton, Oregon


Titanium Coils are used to heat zinc ammonium chloride flux solution with an expected lifetime of 20 years.
Dr. Thomas H. Cook

Dr. Thomas H. Cook
Galvanizing Consultant - Hot Springs, South Dakota, USA

October 29, 2008

Do any Material Safety Data Sheet for this flux?

Tomas Kandra
student - Slovakia

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