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"PARTS COME OUT FROM THE CHROME AT LCD MILKY (WHITE)"
PROBLEM: PARTS COME OUT FROM CHROME TANK ,WHITE CLOUDY AT LOW CURRENT DESITY AREA. WE HAVE NICKEL ACTIVATOR AND CHROME PREDIP BEFORE PARTS GO TO THE CHROME TANK.
Popatbhai B. Patel
electroplating consultant - Roseville, Michigan
If you want help, first help yourself with the basics.
1. Analyze or have analyzed your plating bath. Check the chrome level and sulfate ratio. Depending upon whether or not this is a proprietary bath, the correct number will vary.
2. Have the level of chloride in the chrome tank checked. It should be at less than 100 ppm
3. Check for good electrical contact, current should be on (HOT) when parts are placed in the tank.
4. Use an autoramping rectifier or manually ramp current to initiallize plating.
5. Check anodes - should have a uniform brown film.
6. Check for drag over of activator.
After doing the above, do you still have a problem? If so, list specifics.Gene Packman
process supplier - Great Neck, New York
White wash on nickel is a known problem. Do you have a drag out tank after the nickel? If positive, try to skip it. The nickel activator, when did you last made up a new activator? As for chrome predip, not more than 10 g/l CRO3 otherwise it pasivated the nickel. I hope that parts do not stay in the chrome plating solution without current. Last but not least, ask your supplier for an electrolytic nickel activation.
chemical process supplier - Tel-Aviv, Israel
Check your leveling additive, brigher and pH range.
4th Generation Surface Engineering
Consultant - Arvika,