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Iron Phosphating


What is the problem you are facing?

Poor coating formation in phosphating stage

CAUSE REMEDY
pH not in range. See "Poor Cleaning" Adjust pH (down with acid, up with caustic)

 

Poor Cleaning in De-greasing stage

CAUSE REMEDY
De-greasing bath Temperature too low.
De-greasing bath Concentration too low.
Poor exposure to cleaner solution.
Increase the bath temperature.
Increase concentration of bath.
Check racking.
Check nozzles.
Check pressure.
Increase the pressure if necessary.

Spotty Coating / Streaking

CAUSE REMEDY
Contamination rinses.
Poor Cleaning
Check rinse tanks.
​See “Poor Cleaning”

 

Rusting

CAUSE REMEDY
Coating weight too low.
Dry-off too slow.
Drying between stages.
Increase the bath temperatures.
Lengthen time in phospating stage.
Increase concentration of bath.
Increase temperature in final rinse.
Run at lower temperatures.
Better placement of nozzles.
​Use fog nozzles.

 

Solutions foaming in degreasing

CAUSE REMEDY
De-grease bath temperature too low.
Pressure too high.
Pump picking up air.
Increase the bath temperature.
Check for plugged nozzles.
Check pump packing.
​Check water level.

 

Poor Paint Adhesion

CAUSE REMEDY
Phosphate Coating too heavy.
Poor cleaning in de-greasing stage.
Contamination.
Bad Steel.
Lower temperature.
Lower concentration.
See “Poor Cleaning”.
Look for source of silicone near washer.
​Check raw material for excessive oil.