Quote:
Originally Posted by Norm01
Robert, something is definitely wrong. I go from zinc, to distilled dip, I then lift from distilled dip and spray with fresh distilled water over the distilled bucket then straight into Chromate, 30 seconds or so. Another important thing I found is do not touch the parts after the Chromate dip, it is very fragile in the first 24hrs. Use the same wire and hang it in front of a fan to dry. A shinny Chromate requires shinny zinc, I first bought the Caswell brightener and tried it in my homebrew and found it didn’t make a difference. I had tried polishing the zinc like you did but couldn’t get a good Chromate. My break through was with the Caswell zinc + brightener, no polishing and great results. I have larger parts plated and no one can tell the difference between my parts and the pros.
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Before you solve chromate issues you need to solve zinc plating issues.
The photo looks like the parts have been burned from using too much amperage for those two parts alone amperage should be no more than 1 amp or so.
Are you using degreaser before zinc?? What kind of zinc are you using? What power supply??? How much brightener?