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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High pH of CED bath and low pH of UF permeate and rinses
October 4, 2009
Dear all,
I have problem of high pH is CED bath (6.1) and I cannot charge acid as ph of UF permeate (5.3)and UF rinses (5.35)is going downward already. kindly suggest.
Regards,
Incharge PT.ED line - Karachi, Pakistan
It is difficult to understand the situation. The pH of UF rinses cannot go down if the pH of the E-coat bath is high and going up.
But if what you state is correct, you will have to drain part of the UF rinse 2 and top it up with fresh DI / DM water.
You will have to bring down the pH of the E-coat bath immediately or else the paint kick out will commence and cause more grief!
Best of luck.
Mohali, Punjab, India
October 13, 2009
Q. If pH of CED bath continues to increase, how to control the pH and what are the possible reasons of pH increasing continuously.
Kuldeepyadav- Gurgaon
August 27, 2012
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