Chrome-free surface passivation for aluminum alloys
2025-05-29
Aluminum alloys are widely used in aerospace, automotive, electronics and other fields due to their light weight, high strength and corrosion resistance. However, the traditional chromate passivation process has been strictly limited by international environmental regulations due to the high toxicity and serious pollution of hexavalent chromium. In this paper, the research on chromium-free passivation technology is carried out to explore the film-forming mechanism of silane/rare earth salt composite system, to improve the corrosion resistance of passivation film by optimizing the process parameters, and to analyze its environmental protection and economic value, so as to provide theoretical and technical references for the alternative chromate process. From this paper, we can learn: The application of aluminum is the highest production of non-ferrous metals, the most widely used metal materials. In the metal structural materials, its production is second only to steel. All-Aluminum Engines The advantage of a cast aluminum block is that it is lightweight,...
