Improving the Corrosion Resistance of Ni/SS Thin Films by Nitrogen Ion Implantation |
| A. Grayeli Korpia, A. Armanb, S. Jurečkac, C. Lunad, R. Shakourye, Ş. Ţăluf, S. Rezaeeg, K. Ghoshh, K. Sherafatb, M. Sadeghii, S. Gopikishanj
aPhysics and Accelerators Research School, Nuclear Sciences and Technology Research Institute, Tehran, Iran bVacuum Technology Research Group, ACECR, Sharif University Branch, Tehran, Iran cUniversity of Žilina, Faculty of Electrical Engineering, Institute of Aurel Stodola, Nálepku 1390, 031 01 Liptovský Mikuláš, Slovakia dUniversidad Autónoma de Nuevo León (UANL), Facultad de Ciencias Físico Matemáticas (FCFM), Av. Universidad s/n, San Nicolás de los Garza, 66455, Nuevo León, Mexico eDepartment of Physics, Faculty of Science, Imam Khomeini International University, Qazvin, Iran fTechnical University of Cluj-Napoca, The Directorate of Research, Development and Innovation Management (DMCDI), Constantin Daicoviciu Str., no. 15, Cluj-Napoca, 400020, Cluj county, Romania gDepartment of Physics, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran hDepartment of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya, Bilaspur-495009, Chhattisgarh, India iInstitute of Technology Development, ACECR, Sharif University Branch, Tehran, Iran jInstitute of Aeronautical Engineering, Department of Physics, Hyderabad, Telangana, India |
| Received: July 17, 2019; revised version July 29, 2019; in final form July 30, 2019 |
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| N+ ions were incorporated into nickel-coated 316 stainless steel (SS) at room temperature using different energies (10, 20, and 50 keV) and a fluence of 5×1017 N+ cm-2. The microstructure, surface morphology, and corrosion inhibition of the obtained materials were investigated and compared with the properties of the untreated steel using several analytical techniques. The X-ray diffraction patterns indicated the formation of nickel nitride with the ion implantation process. The surface morphology of the samples was studied by atomic force microscopy and statistical and multifractal analytical methods. Moreover, the potentiodynamic polarization test in 3.5% NaCl solution was carried out to evaluate the corrosion properties of the samples. These studies revealed that the generalized fractal dimension, Dq, is dependent on the ion implantation energy and the symmetry of the multifractal singularity spectra, f(α), which is related to the uniformity of the sample. In this manner, the lowest value was obtained for the sample prepared with the maximum ion implantation energy. Also, the increment of the implantation energy yields to increase the corrosion resistance. The simultaneous decrease of the corrosion current density (Icorr) and the increase of the corrosion potential observed with the N+ ion-implantation indicate that treated samples are more resistant to corrosion than the untreated steel, and the highest corrosion protection was observed for the maximum implantation energy (50 keV). The correlation between corrosion resistance, structural and surface morphology induced by implantation is discussed. |
DOI:10.12693/APhysPolA.136.536 topics: ion implantation, Ni/SS, corrosion, micromorphology, AFM, polarization |