Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Is this a proper Hex Chromate solution?
I have info from a plater that this is how he mixes his Chromate tank, for passivation of Zinc - Nickel plating:
15.6 pounds sodium chloride
1.78 pounds sodium dichromate
5 gallons of water
pH optimum at 1.8
Does this make sense? Is there a reaction between the 2 salts that yields a highly acidic bath?
OEM - West Union, South Carolina, USA
August 25, 2011
November 4, 2011
Sir:
The chromate quench that we developed in Montreal consisted of sodium dichromate, acetic acid
⇦this on
eBay
or
Amazon [affil links] , and HCl to a pH between 4 and 4.5. This hex chrome solution was used on hot dip galvanized steel and passed the hydroquebec 40 hour salt spray test.
Regards,
Galvanizing Consultant - Hot Springs, South Dakota, USA
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