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for Metal Finishing 1989-2025
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Zinc/Yellow Chromate vs Hot Dip Galvanizing
I have some small (11"x3"x4") metal parts that will be outside and exposed to the elements. I am trying to determine if zinc and yellow chromate coating will be as effective as more expensive hot dip galvanizing. I had read a report years ago (which I can not find) stating that the coating process lasted longer than the galv under a salt spray test but the AGA site said the salt spray test is not a good indicator of real world exposure. Any help? I'm really looking for pointers as to where to get documentation one way or the other.
Robert RepettoNovia Associates - Salem, NH, USA
2004
Galvanising will last considerably longer.
Dougie Lightfoot- Fife, Scotland
2004
Under these circumstances the protection is approx. proportional to the thickness of the Zn. Plating might give 10 microns, and galvanizing 80 microns. In general terms then, about 8 times the protection. Theres probably little if any difference in cost.
Geoff Crowley
Crithwood Ltd.
Westfield, Scotland, UK
2004
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