The basis of any good aluminium coating system is preparation. Lack of suitable preparation can be attributed to a vast majority of powder coating failures. Different materials require different preparation and treating aluminium is a specialised process.
Oil and grease is removed in the cleaning solution and the surface must be etched to remove heavy aluminium oxides. Once rinsed, the aluminium is then rinsed and dipped into a chromate solution to form a coating, or film, which is chemically attached. Finally, the aluminium is rinsed again in demineralised water, reducing the presence of chemical salts on the surface.
Proper preparation ensures that the aluminium has a surface that is optimum for the adhesion of powder and reduces the occurrence of under film corrosion.
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