The Open Materials Science Journal
2017, 11 : 29-37Published online 2017 July 31. DOI: 10.2174/1874088X01711010029
Publisher ID: TOMSJ-11-29
RESEARCH ARTICLE
Corrosion Behavior of Plasma Nitrided SS316L Biomaterial
* Address correspondence to this author at the "Nasional" College of Technology Jl. Babarsari No. 1 Caturtunggal, Depok, Sleman, Yogyakarta, Indonesia 55281; E-mail: ratna@sttnas.ac.id
ABSTRACT
Objective:
This research aims to determine corrosion behavior of SS316L biomaterial metals after plasma nitriding process.
Methods:
The plasma nitriding process on the surface of SS316L was performed at 350oC, 400oC, 450oC, 500oC, 550oC and 1.8 mbar nitrogen gas pressure for 3 hours. The surface Nitrogen concentration level distribution from the surface was examined using Energy Dispersive X-ray Spectroscopy, the phases formed after nitriding process were determined using X-ray Diffraction. The corrosion resistance was investigated using three-electrode cell polarization method.
Result:
The results showed that the percentage of nitrogen concentration atoms on the surface of the SS316L after plasma nitriding process was in range of 7.61-21.73%, in which the highest number 21.73% occurred at 500oC. Metal nitride formed on the surface of SS316L for all temperature variations are Fe4N, CrN and β-Cr2N phases were formed after nitriding process. Optimum corrosion resistance (8.21 x 10-4 mm/yr) occurs at 350oC.