ผลขององค์ประกอบของคาร์บอน/เรซินคอมพอสิตต่อสมบัติของแผ่นโลหะเคลือบสำหรับเซลล์เชื้อเพลิงพีอีเอ็ม / จักรพงศ์ ศิริประสมทรัพย์ = Effects of composition of carbon/resin composite on coated metal plate properties for pem fuel cell / Jakrapong Siriprasomsub
This research was to study the effect of composition in coating layer on corrosion protection and electronically conductive of SUS 304 stainless steel coated by carbon/resin composite. The carbon base is carbon brush powder. The additive is carbon nanotubes. Zinc resin and acrydic are used as a binder. The studied parameter was amount of carbon nanotubes (CNTs) 1-5 wt% in carbon/resin composite layers. The composition of coating was 20 wt% of carbon, 30 wt% of resin and 50 wt% of solvent. The spray technique is used to coat carbon composite on the stainless steel. The results were shown that zinc resin binder gave lower interfacial contact resistance (ICR) than acrydic resin, but corrosion rate is higher. The ICR decreased when CNTs were added until 2 wt%. The addition of 3 types of CNTs, high conductivity CNTs (100 S/cm) revealed the best condition for metal coated carbon/resin composite. The corrosion resistance and adhesion of coating film had lower trend in both of resins when CNTs were added over 2 wt%. Addition of CNTs 2 wt%, the ICR at 200 lbf.in tightening force was 35 and 4 mΩcm² when acrydic resin and zinc resin were used, respectively. Corrosion rate of zinc and acrydic resin were 6 and 0.5 µA/cm², respectively. When coated metal plate with zinc resin and acrydic resin were used in fuel cell, current density were 325.2 mA/cm² and 259 mA/cm², respectively. This was less than commercial graphite plate of 395.4 mA/cm².