A thickness of 0.0005 inch with an iridescent chromate conversion coating can give in excess of 5000 hours in the B-117 Salt Fog test. The iridescent chromate has a readily identifiable vivid coloration. If you are now using galvanize, you will know how long the finish can be expected to last. Certainly, I can supply other information if you are interested in learning about this technology. Hope this has been helpful in answering your question.
Smaller manufacturers hang the chain on racks, and rack plate it, usually periodically jiggling it.
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