The aluminum industry has been advancing in the development of chromium-free passivation technology since the 1970s. Initially, these methods were primarily used for surface treatment of aluminum cans. In the 1990s, as environmental concerns grew, the use of hexavalent chromium was phased out due to its harmful effects on the environment and human health. This led to a significant acceleration in the development and adoption of chromium-free passivation technologies, which are now widely applied in the coating processes of steel and aluminum coils.
Today, chromium-free passivation for aluminum alloys mainly relies on zirconium and titanium salts combined with organic polymers. These eco-friendly solutions have found extensive applications across various industries, including automotive body parts, furniture, electronics, aerospace, beverage cans, building profiles, decorative panels, and metal coils. The shift towards such environmentally responsible technologies has become a global trend driven by stricter regulations and increasing consumer awareness.
In response to environmental protection demands, the European Union and the United States have set strict deadlines for the use of chromium-based coatings in exported products, particularly in the automotive and electronics sectors. For example, before July 1, 2006, Chinese manufacturers had to comply with these regulations. Since June 19, 2013, the illegal discharge of heavy metals and persistent organic pollutants that exceed environmental standards by more than three times is considered a criminal offense, leading to legal consequences for both individuals and companies.
Given these regulatory pressures and growing environmental concerns, the transition to chromium-free passivation has become not just a choice but an urgent necessity. Henkel’s chromium-free passivation products stand out for their use of fluorinated organic resins, zirconium, and titanium. These formulations are ideal for treating aluminum sheets, coils, and other aluminum-based materials. They are compatible with various application methods, including vertical waterfall lines, dip lines, and both vertical and horizontal spray systems.
One of the key advantages of Henkel's solutions is that the waste liquid can be safely discharged after neutralization and precipitation, making it easier for companies to meet environmental compliance standards. Moreover, the conversion from hexavalent chromium to chromium-free passivation is straightforward, requiring no modifications to existing equipment, thus reducing implementation costs and downtime.
Henkel’s chromium-free passivation products have received international recognition and certifications, including Qualicoat, GSB-International, MIL-C-81706, and MIL-C-5541. These certifications ensure high performance, reliability, and compliance with global industry standards, making them a trusted solution for manufacturers looking to adopt greener and more sustainable practices.
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