RESEARCH ARTICLE


Corrosion Behavior of Plasma Nitrided SS316L Biomaterial



Ratna Kartikasari1, *, Sutrisna1, Ihwanul Aziz2
1 "Nasional" College of Technology Jl. Babarsari No. 1 Caturtunggal, Depok, Sleman, Yogyakarta, Indonesia 55281
2 PTAPB BATAN Yogyakarta, 55281, Indonesia


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© 2017 Kartikasari et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* 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.

Keywords: Plasma nitriding, SS316L, Biomaterials, Corrosion resistance, Nitrogen, Fe4N.