[China Aluminum Industry Network] Chrome-free passivation of aluminum alloys has developed chromium-free conversion technology as early as the 1970s, and has been widely used in surface passivation coatings for cans. In the 1990s, due to the need of environmental protection, the pollution of hexavalent chromium metal was eliminated. Chromium-free passivation technology has developed rapidly. Chromium-free rinsing technology has been widely used for the passivation of steel coils and aluminum coils.
The chromium-free passivation of aluminum alloys is currently based on zirconium salts and titanium salts and organic polymers. Successfully applied to auto body, auto parts, furniture, electronics, aviation, cans, building profiles, building decorative plates, coils and other industries.
At present, the European Union, the United States, and other countries have set a deadline for the use of chromium-containing passivation films for the export of Chinese products to the auto parts and electronics industry (before July 1, 2006). Enterprises in various industries in the country have changed from chromium passivation to chromium-free passivation. Since June 19, 2013, the illegal discharge of heavy metals, persistent organic pollutants, and other pollutants that seriously harm the environment and damage human health has exceeded the standard by more than three times. This will directly apply to the criminal law and convict directly responsible persons in charge. Penalties, and impose fines on the units.
Therefore, chromium-free passivation of aluminum alloys is imperative and imminent.
Henkel's chromium-free passivation products are characterized by the fluorides of organic resins, zirconium and titanium. Applicable to aluminum, aluminum sheet, aluminum coil and so on. Perfect for vertical waterfall lines, dip lines, vertical or horizontal spray lines. Waste liquid can be discharged only after neutralization and precipitation. The customer's conversion from hexavalent chromium to chromium-free is very simple and the equipment does not require any modification.
Henkel's chromium-free passivation products have passed Qualicoat, GSB-International, MIL-C-81706 ANDMIL-C-5541 certification.
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