Bipolar Plates Coating
Bipolar plates for fuel cells can be manufactured using various techniques, including printing and coating methods. These processes are used to apply the necessary materials and features to bipolar plates, such as conductive coatings, gas flow channels, and corrosion-resistant layers. Here are some common methods:
1. Screen Printing: Screen printing is a technique that can be used to deposit conductive inks or coatings onto bipolar plates. It allows for precise control over the placement of materials and is often used to apply catalyst layers or conductive coatings.
2. Electroplating: Electroplating involves depositing a layer of metal, such as platinum or nickel, onto the bipolar plate's surface. This is often done to enhance the catalytic activity of the plate or improve its corrosion resistance.
3. Sputtering: Sputtering is a physical vapor deposition technique used to deposit thin films of materials onto bipolar plates. It can be employed to apply conductive coatings or corrosion-resistant layers.
4. Chemical Vapor Deposition (CVD): CVD is another technique for depositing thin films onto bipolar plates. It involves chemical reactions to create a coating layer on the plate's surface.
5. Coating with Polymer Materials: Bipolar plates can also be coated with polymer materials to enhance their properties, such as corrosion resistance or gas impermeability.
The choice of method depends on the specific requirements of the fuel cell design and the materials being used. Each technique has its advantages and limitations in terms of cost, precision, and performance. Additionally, the coating or printing process can be customized to meet the unique needs of the fuel cell application.