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"Fluxing steel prior galvanizing"

April 15, 2010

dear sir,

I am currently using triple salt flux and I am heating my tank to 50 degrees C but I am still not happy with the quality that the steel is coming out from galvanising, there is too much ash, we have a drying chamber so the steel is not going in wet. what do you think the problem would be. please advise what should I do cause I can't keep galvanizing like this

Scott Black
galvanizing manager - Australia

April 18, 2010

What is the Fe concentration in your preflux solution?

Geoff Crowley
Crithwood Ltd.
Westfield, Scotland, UK
crithwood logo

May 19, 2010

Well your problem will be no more, please try this way: Keep Flux specific gravity 1.15 - 1.20, Add Glycerine approx. 2%, Iron content as low as possible and pH should be 4. Please try and let me know.

Umesh Dalela
- Bhuj, Gujrat, India

July 17, 2010


The best use of triple salt flux for most general galvanizers is: Temperature 71C, baumé 12 to 14, pH 4.2, Fe+2 under about 1.5%, excellent wetting agent at 0.03%, and when using sulfuric acid as pickle under 1% sulfate in the flux. Your triple salt should have an ACN of 1.18, but likely it is lower due to refluxing galvanized steel or by passing galvanized racks through the flux (dissolves zinc forming zinc chloride in the flux and causing the pH to rise and the ACN to fall). I am evaluating the ACN recommendation for flux when galvanizing with high grade zinc. There are substantial differences in using high grade versus prime western zinc.


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

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