[China Aluminum Industry Net] In order to address the issue of water pollution caused during the production of aluminum alloy products, Foshan Huachang Aluminum Profile Factory began collaborating with South China University of Technology in 2012 to develop a chromium-free passivation treatment technology. After more than six months of intensive research and testing, several key performance indicators have met the expected standards.
According to an official from Huachang, the newly developed chromium-free passivation technology aims to replace the traditional chromate treatment method, which is known for its environmental hazards. This innovation is expected to significantly reduce water pollution in the aluminum extrusion industry. The project has attracted attention from both the Guangdong Provincial and Foshan City Environmental Protection Departments. It was selected as part of the "2008 Guangdong and Hong Kong Key Breakthrough Projects in Key Areas (Foshan Special Projects)" and received funding under the "Key Energy-Saving and Emission Reduction Technology" initiative. The company plans to complete the full development of this technology within three years.
So far, after over six months of testing, some parameters have already reached the desired level. While the wastewater treatment results still need improvement to meet national standards, other properties such as impact resistance and bending strength have already satisfied the required specifications. The team is optimistic that the project will be completed ahead of schedule.
It is worth noting that the current surface treatment process used in the aluminum extrusion industry typically involves chemical conversion coatings containing chromium compounds. These substances are toxic and can cause severe environmental damage if not properly managed. They also pose serious health risks to workers. In contrast, the rare earth-based conversion film offers a non-toxic, environmentally friendly alternative with excellent corrosion resistance. This new technology has gained increasing recognition in recent years and is considered a promising replacement for traditional chromate treatments. With growing environmental awareness and stricter regulations, it is expected to become one of the leading solutions in the industry.
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