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Troubleshooting guide for Chromatising

Green & Yellow Chromium, Colourless coating

THERMASET POWDER COATINGS

UK's Largest privately owned Powder Coatings Manufacturer and Supplier

GREEN CHROMIUM PHOSPHATE
This is general process for the pre-treatment of Aluminium. This bath contain Mixtures of phosphoric acids, chromic acids and additives. This process is more popular in the food industry as it is non toxic. This process forms excellent substrate for powder coatings. The coating formed is dark green in colour weighing 0.5-1.5 gm/m2, It gives limited corrosion resistance.

Chromate Process

Metal Pre-Treatment

YELLOW CHROMIUM CHROMATE
This process is more popular in the powder coating industry. The bath contain mixture of chromic acid along with accelerators. This process gives dark yellow coloured (process applicable to OEMs) coating which is having high corrosion resistance. Since this process is based on hexavalent croium, it suffers from the disadvantages such as effluent problems etc.

COLOURLESS COATING
This process is a modified process originated from process b) and used for certain application ( lacquer coat/- clear coat applications) where it is desired to retain the original metallic Aluminium appliance. The coating formed is having limited protected value. This process is not popular in the industry.

General Tips

Iron Phosphating

Zinc Phosphating