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Chemical corrosion resistance of niobium-titanium alloys in fuel cells

Niobium-titanium alloy has excellent chemical corrosion resistance in fuel cells, especially in the application of proton exchange membrane fuel cells. It has the following key characteristics:
Corrosion resistance
1. Superior corrosion resistance:
• The corrosion resistance of niobium-titanium alloy is significantly higher than that of traditional stainless steel materials, which makes it effective in resisting chemical corrosion in fuel cell environments and extending the service life of equipment. For example, niobium-titanium alloy shows a low corrosion current density in a sulfuric acid solution containing fluoride ions, which is much lower than the level of pure titanium and common titanium alloys (such as Ti-6Al-4V), which shows its resistance to harsh environments. More durable.

2. Electrochemical properties:
• Under standard test conditions, the corrosion current density of niobium-titanium alloys is significantly reduced, showing a 4 to 9 times improvement in corrosion resistance. This characteristic enables niobium-titanium alloys to better meet the long-life and high-reliability requirements of fuel cells.

3. Adapt to high temperature and acidic environment:
• Niobium-titanium alloys maintain their structural integrity and chemical stability under high temperatures and acidic conditions. Research shows that under the conditions of 80°C, 0.5M sulfuric acid + 5ppm fluoride ion solution, it has excellent corrosion resistance and is suitable for use as fuel cell bipolar plate materials.

Application prospects
Niobium-titanium alloy has become an ideal material for bipolar plates of proton exchange membrane fuel cells due to its excellent chemical corrosion resistance. This material not only improves the overall efficiency of fuel cells, but also shows broad application prospects and economic value in new energy vehicles and other fields.