• Pradeep Metal Treatment Chemicals Private Limited

Chromatizing Chemicals, Green

Pradeep Metallurgical Products offers Unichrome-P, a green phosphate-chromate process, which is an excellent pre-treatment for aluminum and its alloys, by dipping processes. This treatment leaves on the aluminium metal substrate very uniform, lustrous green phosphate-chromate coating. The colour intensity and the coating thickness shall depend upon the bath concentration, immersion period, composition of the metals, etc. The phosphate-chromate conversion coating offers excellent corrosion resistance (more than 250 hours on a 5% sodium chloride salt-spray test) and added bonding with the paints, powder coatings and organic coatings deposited on the metal. The treated components are then immediately oven dried/forced air-dried and painted preferably within 24 hours. In the case of aluminium alloys, it is recommended to give a 5 minutes dip in a 5 percent solution of activator solution for the removal of the oxide scales and the rust spots. Unichrome-P is used at a concentration of 5% V/V, for a dipping period of 8-10 min at room temperature. Periodic checking of TA/FA is recommended. Water rinsing and drying after chromatizing shall be done.