Pulse electroplating of Ni-W-P coating and its anti-corrosion performance |
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Authors: | Hai-hui ZHOU Zuo-wei LIAO Chen-xu FANG Huan-xin LI Bin FENG Song XU Guo-fei CAO Ya-fei KUANG |
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Affiliation: | 1. State key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China;2. College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;3. Hunan Electric Power Company, State Grid Corporation of China, Changsha 410000, China;4. Petro China West-East Gas Pipeline Company, Shanghai 200122, China |
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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. |
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Keywords: | pulse electroplating Ni-W-P coating corrosion resistance |
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