Study on Corrosion Resistance Characteristics of 316L Stainless Steel Bipolar Plate Element Enrichment
GUO Jingang1,2, CHEN Hong3, LI Junrong4, TANG Zilong2, CHEN Qingming1
1 School of Materials Science and Engineering, Kuming University of Science and Technology, Kuming 650093, China 2 State Key Laboratory of Advanced Ceramics and Fine Technology, Tsinghua University, Beijing 100084, China 3 Bejing Aerospace Propulsion Institute,Beijing 100076,China 4 Chunhua Hydrogen Energy Technology Co., Ltd., Dongguan 318000,China
Abstract: The corrosion resistance of bipolar plates is one of the key property restricting the industrial application of proton exchange membrane (PEM) water electrolysis hydrogen production technology. By modifying the metal stainless steel coating to improve the corrosion resis-tance, it can increase its service life, increase the conversion rate, reduce the cost, and achieve the purpose of industrial production. This article used 316L stainless steel as the test sample, the sample to be tested was coated with epoxy resin, and the exposed size in the solution was 1 cm×1 cm during the test. In the electrolyte of 1 mol/L Na2SO4 solution, the enrichment potentials were 1.2 V, 1.3 V, 1.4 V, 1.5 V, 1.6 V, respectively, the Cr and Ni elements were enriched, and the reaction was carried out in the 2 mol/L H2SO4 solution. The potential polarization test obtained the corrosion characteristics of the two samples without cathodic reduction before enrichment and cathodic reduction at -1.3 V, including corrosion current density and corrosion potential. Through scanning electron microscope test, X-ray photoelectron spectroscopy test, contact resistance test, the influence of cathodic reduction process and element enrichment potential on element enrichment was explored. The results show that the cathodic reduction at -1.3 V and the element enriched at 1.5 V have the best corrosion resistance. In addition, the element enrichment experiment results under the condition of the enrichment potential is 2 V show that too high element enrichment potential will damage the enrichment layer on the surface of the material and reduce the corrosion resistance of the bipolar plate.
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2021, Vol. 35 
