1. Pulse electroplating of Ni-W-P coating and its anti-corrosion performance
- Author
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Haihui Zhou, Bin Feng, Yafei Kuang, Guo-fei Cao, Song Xu, Huan-xin Li, Chen-xu Fang, and Zuo-wei Liao
- Subjects
Materials science ,Scanning electron microscope ,Metals and Alloys ,chemistry.chemical_element ,02 engineering and technology ,Electrolyte ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Geotechnical Engineering and Engineering Geology ,Condensed Matter Physics ,01 natural sciences ,Copper ,0104 chemical sciences ,Corrosion ,Dielectric spectroscopy ,chemistry ,Coating ,Materials Chemistry ,engineering ,Composite material ,0210 nano-technology ,Electroplating ,Mass fraction - Abstract
Ni-W-P coatings were electrodeposited on copper substrates by pulse electroplating. Effects of electrolyte pH (1-3), temperature (40–80 °C), average current density (1–7 A/dm2) and pulse frequency (200–1000 Hz) on deposition rate, structure and corrosion resistance performance of Ni-W-P coatings were studied by single factor method. Surface morphology, crystallographic structure and composition of Ni-W-P coatings were investigated by means of scanning electron microscopy, X-ray diffractometry and energy dispersive X-ray spectroscopy, respectively. Corrosion resistance performances of Ni-W-P coatings were studied by potentiodynamic polarization and electrochemical impedance spectroscopy in 3.5% NaCl solution (mass fraction) and soil-containing solution. It was found that the pulse electroplated Ni-W-P coatings have superior corrosion resistance performance and the electroplating parameters significantly affect the structure and corrosion resistance performance of Ni-W-P coatings. The optimized parameters of pulse electroplating Ni-W-P coatings were as follows: pH 2.0, temperature 60 °C, average current density 4 A/dm2, and pulse frequency 600 Hz. The Ni-W-P coating prepared under the optimized parameters has superior corrosion resistance (276.8 kΩ) and compact surface without any noticeable defect.
- Published
- 2018