China Aluminum Online recently reported that to effectively address water pollution in the production of aluminum alloy products, Foshan Huachang Aluminum Profile Factory has been collaborating with South China University of Technology since last year. The goal is to develop a chromium-free passivation treatment technology for aluminum alloys. After more than six months of research and testing, several key performance indicators have reached the expected targets.
According to an official from Huachang, the new chromium-free passivation technology replaces the traditional chromate treatment, which is known for its environmental hazards and health risks. This innovation has attracted significant attention from environmental protection authorities in Guangdong Province and Foshan City. The project was selected as one of the "2008 Guangdong and Hong Kong Key Breakthrough Projects in Key Areas (Foshan Special Projects)" under the "Key Energy-Saving and Emission Reduction Technology" category. The company plans to complete the full development of this technology within three years.
So far, the experimental results show that while the wastewater test results are still slightly below national standards, other properties such as impact resistance and bending strength have already met the required benchmarks. The team is optimistic that the project will be completed ahead of schedule.
It is worth noting that the current surface treatment method used in the aluminum extrusion industry typically involves a chemical conversion process containing toxic chromium compounds. These substances can cause severe environmental damage and pose serious health risks if not properly managed. In contrast, the rare earth conversion film used in the new technology is non-toxic, pollution-free, and offers excellent corrosion resistance. As a result, this innovative approach has gained increasing recognition within the industry and is expected to become a leading alternative to traditional chromate treatments in the near future.
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