Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 159, Issue 11, Pages D642-D648Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.012211jes
Keywords
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Funding
- National Natural Science Foundation of China [51001089]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20100101120026]
- Research Cooperation Project of Guangdong Province
- Ministry of Education [2010A090200047]
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Ni-P alloy coatings with tunable phosphorus contents are electrodeposited at room temperature using choline chloride: ethylene glycol (1: 2 molar ratio) deep eutectic solvent and NiCl2 center dot 6H(2)O, NaH2PO2 center dot H2O as nickel and respectively phosphorous sources. Cyclic voltammetry shows that the presentence of H2PO2- in the ionic liquid based Ni plating bath promotes the initiation of Ni-P nucleation. Chronoamperometric results indicate that the electrodeposition of Ni and Ni-P alloys on a platinum electrode follows the mechanism of instantaneous nucleation and three-dimensional growth with diffusion-controlled. Surface morphology and chemical composition of the alloy coatings are significantly dependent on the molar ratio of H2PO2-/Ni2+ in the electrolyte. Moreover, deposition potential and time have a remarkable effect on the surface morphology of deposits. X-ray diffractometer analysis indicates that the structure of alloys converts from crystalline to amorphous structure as the phosphorus content in the coating increases. Potentiodynamic polarization measurements show that the alloy coating exhibits the nobler corrosion potential and the lower corrosion current density compared with the Ni coating. The more phosphorus content the Ni-P coating has, the more positive corrosion potential and the lower corrosion current density the coating exhibits. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.012211jes] All rights reserved.
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