| CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES |
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Synthesis and performance of Zn-Ni-P thin films |
| V. Soarea, M. Buradaa, I. Constantina, M. Ghitaa, V. Constantinb, F. Miculescuc, A. M. Popescub |
a New Materials and Technologies Laboratory, National Research and Development Institute for Nonferrous and Rare Metals-IMNR, 102 Biruintei Blvd, Pantelimon, Ilfov-077145, Romania;
b Institute of Physical Chemistry “Ilie Murgulescu”, Laboratory of Molten Salts, 202 Splaiul Independentei, Bucharest-060021, Romania;
c University Polytehnica of Bucharest, Center of Biomaterials (BIOMAT), 313 Splaiul Independentei, Bucharest-060042, Romania |
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Abstract The electroplating of Zn-Ni-P thin film alloys from a sulfate bath containing phosphoric and phosphorous acid was investigated. The bath composition and the deposition parameters were optimized through Hull cell experiments, and the optimum experimental conditions were determined (pH = 2, temperature = 298-313 K, zinc sulfate concentration = 30 g· L-1, EDTA concentration = 15 g· L-1, and current density=1.0-2.0 A· dm-2). The SEM analysis of the coating deposited from the optimum bath revealed fine-grained deposits of the alloy in the presence of EDTA. Optical microscopy analysis indicated an electrodeposited thin film with uniform thickness and good adhesion to the steel substrate. The good adherence of the coatings was also demonstrated by the scratch tests that were performed, with a maximum determined value of 25 N for the critical load. Corrosion resistance tests revealed good protection of the steel substrate by the obtained Zn-Ni-P coatings, with values up to 85.89% for samples with Ni contents higher than 76%. The surface analysis of the thin film samples before and after corrosion was performed by X-ray photoelectron spectroscopy (XPS).
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Received: 04 July 2014
Revised: 07 October 2014
Accepted manuscript online:
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PACS:
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61.66.Dk
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(Alloys )
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68.55.-a
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(Thin film structure and morphology)
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81.65.Kn
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(Corrosion protection)
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82.80.Pv
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(Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.))
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| Fund: Project support by the Partnership Romanian Research Program (PNCDI2), CORZIFILM Project nr.72-221/2008-2011 and “EU (ERDF) and Romanian Government” that allowed for acquisition of the research infrastructure under POS-CEEO 2.2.1 project INFRANANOCHEM-Nr.19/01.03.2009. |
Corresponding Authors:
V. Constantin, A. M. Popescu
E-mail: popescuamj@yahoo.com;virgilconstantin@yahoo.com
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Cite this article:
V. Soare, M. Burada, I. Constantin, M. Ghita, V. Constantin, F. Miculescu, A. M. Popescu Synthesis and performance of Zn-Ni-P thin films 2015 Chin. Phys. B 24 036101
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