thermaset_logo

Troubleshooting guide for Chromate Process

List of common coating defects and remedies

THERMASET POWDER COATINGS

UK's Largest privately owned Powder Coatings Manufacturer and Supplier

BATH PICKLES METAL AND CREATES DUSTY COATING

CAUSE

Accelerator level too high

REMEDY

Reduce accelerator level by processing the aluminium or auto draining and adjusting the bath

Chromatising

LOW COATING WEIGHT

CAUSE

Aluminium concentration too high in the bath
Accelerator too low
Concentration too low
Total acid too high in relation to chronium concentration

REMEDY

Auto drain and adjust
Add accelerator
Add make-up chemical
Auto drain bath and adjust

Metal Pre-Treatment

NO COATING

CAUSE

Total absence of accelerator in the bath

REMEDY

Add accelerator

SLUDGE PLUGGING IN NOZZLES

CAUSE

Aluminium concentration in bath too high
Alkaline salts dragged into bath

REMEDY

Auto drain bath and adjust
Increase overflow rate of rinse following cleaner

General Tips

Iron Phosphating

Zinc Phosphating