Aluminum Chromate Conversion Process
As part of the aluminum pre-treatment process, conversion is an integral step in the overall manufacturing process and especially prior to painting. After a specific preparation cycle, the conversion coating creates deposits on chromium and aluminum salts, which increase corrosion resistance to atmospheric conditions, while improving paint bonding. Chromate conversion coatings provide excellent protection for unpainted aluminum and substantially improve paint adhesion.
The coatings are applied using conventional spray or dip processing equipment. The usual stages in the process: cleaning, rinsing, treatment with BONDERITE® chromate conversion coating, rinsing and drying. Once dried, the coated item is ready for use, but can also be painted. The unpainted colour may vary from yellow to brown depending on the coating thickness. Henkel’s experienced team has developed specific coating products for different alloys and different functional finishes.
The large range of applications ensures a wide variety of high quality Al alloy coatings. The key advantage of Henkel’s liquid products is automatic dosing equipment, which makes life easy for workers, increasing safety and keeping them healthy.