Recently, SHJZ Hydrogen Technology Corporation has made another breakthrough in metal bipolar plate coating technology. On the basis of the fourth-generation coating that completely solves the industry bottleneck of metal plate anti-corrosion, electrical conductivity, and low cost, through process and equipment upgrades, The high potential corrosion resistance is increased by 10 times.
At present, commonly used fuel cell metal plate coatings include carbon-based, precious metals, and so on. Carbon has good electrical conductivity and low cost, but carbon materials inevitably corrode under external potential, and the corrosion current increases with the increase of external potential, and obviously increases when the external potential exceeds 0.8V.
During the process of fuel cell start-up and shutdown, load and load reduction, and low-temperature operation, local high potentials of 1.0-1.4V (open circuit, reverse polarity, etc.) are prone to occur locally, so it is difficult for carbon-based coatings to guarantee the life of the metal plate stack. Although precious metals such as gold have both corrosion resistance and electrical conductivity, the cost is difficult to reduce, and they are not suitable for industrialized batch applications.
Previously, SHJZ has developed the fourth-generation coating based on the third-generation independent equipment. Compared with the third-generation carbon-based coating, the corrosion current at high potential (1.6V vs. SHE) has been reduced from 200μA/cm2 to 50μA/cm2. This time, based on the fourth-generation independent continuous production equipment, combined with process upgrades, the corrosion current is further reduced to 5μA/cm2.
The successful application of this technology will further increase the life of the SHJZ hydrogen fuel cell stack and greatly reduce the stack cost per unit time period.