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Properties of a Plasma-Nitrided Coating and a CrNx Coating on the Stainless Steel Bipolar Plate of PEMFC
- Source :
- Coatings, Vol 10, Iss 2, p 183 (2020), Coatings, Volume 10, Issue 2
- Publication Year :
- 2020
- Publisher :
- MDPI AG, 2020.
-
Abstract
- PEMFC are considered to be the most promising for automotive energy because of their good working effect, low temperature, high efficiency, and zero pollution. Stainless steel as a PEMFC bipolar plate has unparalleled advantages in strength, cost, and processability, but it is easy to corrode in a PEMFC working environment. In order to improve the corrosion resistance, the surface modification of 316L stainless steel is a feasible solution for PEMFC bipolar plates. In the present study, the plasma-nitrided coating and CrNx coating were prepared by the plasma-enhanced balanced magnetron sputtering technology on the 316L stainless steel surface. The microstructures, phase compositions, and corrosion resistance behavior of the coatings were investigated. The corrosion behavior of the prepared plasma-nitrided coating and CrNx coating was investigated by potentiodynamic polarization, potentiostatic polarization, and electrochemical impedance spectroscopy (EIS) in both cathodic and anodic environments. The experimental results show that corrosion resistance of the CrNx coating was better than the plasma-nitrided coating. It was indicated that the technology process of nitriding first and then depositing Cr was better than nitriding only.
- Subjects :
- Materials science
corrosion resistance
magnetron sputtering
Surfaces and Interfaces
Sputter deposition
engineering.material
Microstructure
Surfaces, Coatings and Films
Corrosion
Cathodic protection
Dielectric spectroscopy
Coating
plasma-nitrided coating
lcsh:TA1-2040
Materials Chemistry
engineering
Composite material
crnx coating
Polarization (electrochemistry)
lcsh:Engineering (General). Civil engineering (General)
bipolar plate
Nitriding
Subjects
Details
- Language :
- English
- ISSN :
- 20796412
- Volume :
- 10
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Coatings
- Accession number :
- edsair.doi.dedup.....b924e15fd54ebbb59e1910415f61c073