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| Hauptseite > Publikationsdatenbank > The Electrochemical Behavior of CrN/Cr Coatings with Artificial Defects on 316L Stainless Steel in the Simulated Cathodic Environment of an HT-PEFC |
| Hauptseite > Publikationsdatenbank > The Electrochemical Behavior of CrN/Cr Coatings with Artificial Defects on 316L Stainless Steel in the Simulated Cathodic Environment of an HT-PEFC |
| Journal Article | FZJ-2019-03602 |
; ; ;
2019
Electrochemical Soc.
Pennington, NJ
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Please use a persistent id in citations: doi:10.1149/2.0591913jes
Abstract: This paper concerns the corrosion behaviors of CrN/Cr-SS316L (with artificial defects) in a simulated high-temperature polymer electrolyte membrane fuel cell (HT-PEFC) cathode environment and the effect of oxygen on its corrosion processes. The overall anti-corrosion performance of CrN/Cr-SS316L (with artificial defects) was evaluated using the potentiodynamic polarization method under the environment with either N2 or O2 purging atmosphere. Electrochemical impedance spectroscopy was used to clarify the mechanisms of the corrosion processes. Scanning electron microscopy was then carried out to investigate the morphological changes of coated specimens before and after corrosion tests under different gas purging atmospheres. The existence of O2 is essential for the CrN/Cr coating with surface defects maintaining good corrosion resistance in an HT-PEFC and oxygen could initialize the self-healing ability of CrN/Cr coating with defects in the hot phosphoric acid. On the basis of the experimental findings, the mechanisms of the influence of oxygen on the corrosion processes of the CrN/Cr-SS316L in the simulated cathodic environment of an HT-PEFC are ultimately proposed.
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