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Zinc Phosphating


What is the problem you are facing?

Coating weight too low

CAUSE REMEDY
Phosphate or Accelerator concentration too low.
Phosphate bath temperature too low.
Process time too low.
Increase Concentration.
Increase phosphate bath temperature.
​Lengthen time phosphating stage.

 

Coating weight too high

CAUSE REMEDY
Phosphate or Accelerator concentration too high.
Process time too long.
Decrease concentration.
​Shorten time.

 

Powder on Coating

CAUSE REMEDY
Poor rinses.
Excessive sludge.
Accelerator concentration too high.
Higher bath temperature.
Keep rinse overflowing.
D-sludge tank.
Allow concentration to drop.
​Lower the temperature of the bath.

 

Spotty Coating

CAUSE REMEDY
Poor cleaning.
Low concentration of Phosphatizer or Accelerator.
Poor solution coverage.
Resistant Metal.
Check cleaning tank.
Increase concentration.
Check racking and nozzles.
​Add Jernstedt salts to rinse or clean tank.

 

Rusting

CAUSE REMEDY
Coating weight too low.
Final dry-off too slow.
Dry-off between stages.


Higher free acid pointage in phosphating bath.
See “Trouble-Coating Weight too Low”.
Increase temperature in the final rinse - use air blow-off.
Better placement of nozzles.
Use fog nozzles.
Run at lower temperatures.
​Reduce the free acid pointage.

 

Streaking

CAUSE REMEDY
Poor cleaning.
Poor rinsing.
Dry-off between stages.
Check cleaning stage.
Keep over-flowing.
Better arrangement of nozzles.
Use fog nozzel.
​Run at lower temperatures.