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Chromate Process


What is the problem you are facing?

Bath pickles Metal and creates Dusty Coating

CAUSE REMEDY
Accelerator level too high Reduce accelerator level by processing the aluminium or autodraining* and adjusting the bath.

 

Low Coating Weight

CAUSE REMEDY
Aluminium concentration too high in bath.
Accelerator too low.
Concentration too low.
Total acid too high in relation to chromium concentration.
Autodrain* and adjust.
Add accelerator.
Add make-up chemical.
‚ÄčAutodrain* bath and adjust.

 

No coating

CAUSE REMEDY
Total absence of accelerator in bath. Add accelerator.

 

Sludge Plugging in Nozzles

CAUSE REMEDY
Aluminium concentration in bath too high.
Alkaline salts dragged into bath.
Autodrain* bath and adjust.
‚ÄčIncrease overflow rate of rinse following cleaner.

 

*Autodraining is a technique whereby the solution is simultaneously being drained and replenished with fresh water and make-up chemical.