Northeastern University of Japan and Northeast Special Steel Company announced on September 5, 2013 that the two units jointly developed the “single tap†for the use of electromagnetic valve cores for the control of pure water flow in solid polymer fuel cells (PEFC). High corrosion-resistant electromagnetic stainless steel." This is the first time that a high corrosion-resistant stainless steel material with excellent machinability (machining properties) has been developed. By using this material, it is expected to reduce the processing cost of a solenoid valve component used in a water environment.
PEFC uses pure water when cooling humidified electrolyte membranes, using water vapor to reform city gas to hydrogen, and cooling electrodes. At these times, the electromagnetic valve components that control the flow of pure water are subject to corrosion, which results in the dissolution of their components, resulting in deterioration of the quality of the water and thus in the reduction of power generation performance. Therefore, such components are to be used in materials having high corrosion resistance in a water environment. One of them is the “K-M38†electromagnetic stainless steel with excellent corrosion resistance and magnetic properties. This type of stainless steel has high corrosion resistance. However, since it does not contain free-machining components such as manganese sulfide (MnS) that affect corrosion resistance, it has the disadvantage of low processing efficiency.
This new material named "K-M38CS" overcomes this shortcoming and disperses carbon sulfide (TiCS) as a free-machining component in the material. This includes the use of lead-free free-cutting steel technology developed by Tohoku University in Japan, the Northeast Center of the Japan Industrial Technology Research Institute, and special steel.
Professor Shinichi Shinohara, a professor of electrical chemistry at Tohoku University in Japan, measured the corrosion resistance and component dissolution of K-M38CS in an ultra-pure water environment simulating PEFC at a temperature of 80°C. The results show that even if TiCS is in a dispersed state, it is not different from the original. The K-M38 has the same corrosion resistance. After obtaining this result, Northeast Special Steel decided to position the K-M38CS as an alternative to the K-M38. It plans to provide samples to the solenoid valve manufacturer and gradually transfer it to mass production.
This result is scheduled to be published at the "60th Material and Environmental Symposium" held by the Japan Society for the Prevention of Corrosion Engineering on September 24, 2013 at "CORASSE Fukushima" (Fukushima City). (Reporter: Enohara Hiroyuki, "Nikkei Manufacturing")
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