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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Excess Sludge in Phosphating Bath
Dear Sir
We have a 9 stage spray pre-treatment line.
We are facing a problem we get lot of sludge in our phosphating tank.
Can any one help me on this. We maintain, low toner, temp 50, T.A.
24, F.A. 0.8 and still we have this problem.
Regards
Paint Shop - Noida, U.P., India
2005
Not enough info. on your system to fairly comment. What is your bath loading , component size and material.?
What nozzle type and at what pressure are you spraying. How do you control replenishment: batch additions or continuous feed.? How do you control temperature and how is you your tank heated. ? How much sludge are you generating.?
Is it a "conventional" low zinc process ? : What are your zinc levels .? How do you desludge ? continuous process or shut it all down and dig it out.
More info needed.
- Chandler, Arizona, USA
2005
You didn't mention what kind of phosphate bath you have. A bit of sludge in an iron phos bath is normal. You may want to look at your feed water. I've found RO water (low salts, practically no hardness) will decrease sludging in my application.
Trent Kaufman
electroplater - Galva, Illinois
2005
We are controlling the parameters with the latest electronic gadgets and removing the sludge continuously some times manually if our sludge removal system does not work on off days.
Regards
- Noida, U.P., India
2005
2005
Dear Sir
We are using Tri-cation Zinc Phospahte.
Regards
- Noida, U.P., India
At what pressure is your phosphate being sprayed?
What nozzle type are you using. Eg. hollow cone whirl jet ?
Low pressure , high volume preferable.
Have you the capability of changing your parameters. Try increasing your FA 0.1 at a time and observe any changes in coating characteristics.
Are you judging the sludge levels based on a measurement of
"what's in the Tank " or are you looking at the amount being removed by your equipment and thinking "that's a lot of sludge ! "
- CHANDLER, Arizona, USA
2005
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