Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 28, Issue 1, Pages 88-95Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(18)64641-2
Keywords
pulse electroplating; Ni-W-P coating; corrosion resistance
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Ni-W-P coatings were electrodeposited on copper substrates by pulse electroplating. Effects of electrolyte pH (1-3), temperature (40-80 degrees C), average current density (1-7 A/dm(2)) 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 degrees C, average current density 4 A/dm(2), and pulse frequency 600 Hz. The Ni-W-P coating prepared under the optimized parameters has superior corrosion resistance (276.8 k Omega) and compact surface without any noticeable defect.
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