Chromate Process
Troubleshooting
Chromate Process
List of common coating defects and remedies
CHROMATE PROCESS – TROUBLESHOOTING GUIDE
Thermaset Powder Coatings
Bath pickles, metal and creates dusty coating
CAUSE
SOLUTION
Accelerator level too high
Reduce accelerator level by processing the aluminium or auto draining and adjusting the bath
Low coating weight
CAUSE
SOLUTION
Aluminium concentration too high in the bath
Auto drain and adjust
Accelerator too low
Add accelerator
Concentration too low
Add make-up chemical
Total acid too high in relation to chronium concentration
Auto drain bath and adjust
No coating
Total absence of accelerator in the bath
Add accelerator
Sludge plugging in nozzles
Alkaline salts dragged into bath
Increase overflow rate of rinse following cleaner
Aluminium concentration in bath too high
Auto drain bath and adjust