June, 2012

Substrates Aluminium,steel,zinc alloys,copper and galvanized steel are common metals on which powder coatings are applied.  In a number of cases where normal service conditions apply, satisfactory properties can be obtained on thoroughly cleaned metal. Aluminium For aluminium and its alloys,performance can be upgraded using a proprietary chromate conversion coating, even though the clean surfaces are easily coated and adhesion is excellent Steel For iron/steel surfaces maximum corrosion and salt spray resistance are given by a zinc phosphate conversion coating. Zinc alloys With allRead More …

The main aims in the preparation of a metal surface before powder coating may be defined as follows: The conditioning of the surface so as to render it suitable for the coating that is to be applied The complete removal of all foreign matte,e.g,scale,grease,cutting oil,soil,welding splatter,etc The pretreatment should impart uniformity throughout all treated workpiece surfaces,irrespective of the source of the metal or of the contaminants that might adhere. As with other methods of organic finishing attention to the pretreatment stage isRead More …