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Weight of hex chromate



2002

Many of our customers are asking for the "weight" of a hexavalent clear or yellow chromate. Is there a formula to calculate this?

Ed Farrer
- Lombard, Illinois, USA


2002

Ed,

If you are talking about an aluminum chromate coating, then yes there is a method of checking it. I really need more specifics on the product that you are using, but for an aluminum chromate coating, take test panels and run them through the bath at 3 different times, then weigh them, strip them in a 50% Nitric/Water solution and then weigh them again. Take your difference in weight and multiply it by 8000 and that will give you the coating weight in milligrams/foot squared, the units that most customers look for.

Good Luck.

Tony Schmaltz
- Kent, Washington

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