Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8011730 | Transactions of Nonferrous Metals Society of China | 2018 | 8 Pages |
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.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Hai-hui ZHOU, Zuo-wei LIAO, Chen-xu FANG, Huan-xin LI, Bin FENG, Song XU, Guo-fei CAO, Ya-fei KUANG,