Abstract
Using an electrochemical cell that was specially-designed for HT-PEFC experimental requirements, we analyzed a CrN/Cr-coated SS316L using potentiodynamic, potentiostatic and free corrosion potential monitor tests in the simulated cathodic environment of an HT-PEFC. By purging different gases (nitrogen, oxygen) into the electrolyte, we also investigated the influence of oxygen on the corrosion resistance of the CrN/Cr coating in simulated cathodic HT-PEFC environments. Additionally, ex-situ characterizations using SEM+EDX and ICR were carried out to investigate the metallic surface, anti-corrosion properties and interfacial contact resistance of samples before and after corrosion tests were carried out. Cathodic operation conditions included relatively high potential and the presence of oxygen beneficial for CrN/Cr coating so as to provide sufficient corrosion resistance to the cathodic HT-PEFC environment. Therefore, the CrN/Cr coatings are promising for the application in the cathode side of HT-PEFCs.
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