a) Green Chromium Phosphate:
This is general process for the pre-treatment of Aluminium. This bath contian 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.
b) 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.
c) 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.
Links in this section:
• epoxy polyester powder • epoxy powder • polyester powder
• speciality powder • why powder coatings? • household appliances
• automotive components • furniture • architectural • electrical
• metal pre-treatment • chromatising • iron phosphating • zinc phosphating
• chromate process • troubleshooting tips • material safety sheets
This is general process for the pre-treatment of Aluminium. This bath contian 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.
b) 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.
c) 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.
Links in this section:
• epoxy polyester powder • epoxy powder • polyester powder
• speciality powder • why powder coatings? • household appliances
• automotive components • furniture • architectural • electrical
• metal pre-treatment • chromatising • iron phosphating • zinc phosphating
• chromate process • troubleshooting tips • material safety sheets
Coating Types:
• Epoxy Polyester Powder
• Epoxy Powder
• Polyester Powder
• Speciality Powder
Technical Sheets• Click here to download
