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- Title
Characterization of electrodeposited Ni-MoS<sub>2</sub> composite coatings under the influence of current density.
- Authors
Gana, A.; Ben Temam, H.; Lekmine, F.; Naoun, M.; Herzallah, O.
- Abstract
In this paper, the influence of current density on electrodeposited Ni-MoS2 composite coatings has been studied for the first time. Low carbon steel alloy has been selected as a substrate. The Ni-MoS2 composite coatings are deposited at a temperature of 48 °C with applied current densities of (1, 2, 3 and 4 A/dm²). The x-ray diffraction (XRD) analysis of electrodeposited Ni-MoS2 coatings depicts a number of sharp peaks indicating a good crystallinity. Using ASTM database, the peaks at 14°, 32°, 33°, 39°, 49° and 58° correspond to (200), (100), (101), (103), (105) and (110) hkl planes respectively. The morphology was examined by scanning electron microscopy (SEM). Microhardness measurements show that all Ni-MoS2 samples are harder than low carbon steel substrate. EDX analysis of the Ni-MoS2 composite confirmed that the fraction of MoS2 increased with the increase of applied current density. The study of corrosion properties was carried out in a 0.6M NaCl solution. The potentiodynamic polarization curve of electrodeposited Ni-MoS2 confirmed that the corrosion resistance increases with the decrease of applied current density. In addition, Electrochemical tests show that the optimal value of applied current density is 3 A/dm² in the sense of the least value of Ecorr = -314,1 mV and the best resistance was Rp = 9.52 K.cm².
- Subjects
MILD steel; LOW alloy steel; COMPOSITE coating; SCANNING electron microscopy; CORROSION resistance
- Publication
Digest Journal of Nanomaterials & Biostructures (DJNB), 2021, Vol 16, Issue 3, p815
- ISSN
1842-3582
- Publication type
Article
- DOI
10.15251/djnb.2021.163.815