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zinc coating for couplings by method of thermo-diffusion
what does "thermo-diffusion" mean here?
Did you even do an internet search? Geez!
Lots of hits here.
Here is just one of many hits on "thermal diffusion galvanizing" that appear to fit your situation: http://www.armycorrosion.com/past_summits/summit2009/09Presentations%5CDay3%5CMosheMoked.pdf
thanks for your reply and your help is much appreciated