does anyone know where i can find a ranking of the costs of the non- hexavalent chrome coatings that are used for fasteners. I found this very helpful posting with a table of the coatings ranked by corrosion resistance, but not cost. thread332-189454. can I assume that the least effective are the cheapest?
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non-hexavalent chrome coatings 1
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Yes, you can assume that the least effective are the least expensive.
The lowest performance on that chart is a simple zinc phosphate, with a relative cost of 1.
DELTATONE / DORRELTECH B17 14 µ would have a relative cost of 6.
Geomet is 7.
Zinc platings with TRIVALENT chromate conversion coatings have relative cost > 10.
So, the high-performing zinc-flake coatings are less expensive than the lower-performing zinc platings. Food for thought.
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
The lowest performance on that chart is a simple zinc phosphate, with a relative cost of 1.
DELTATONE / DORRELTECH B17 14 µ would have a relative cost of 6.
Geomet is 7.
Zinc platings with TRIVALENT chromate conversion coatings have relative cost > 10.
So, the high-performing zinc-flake coatings are less expensive than the lower-performing zinc platings. Food for thought.
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
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