Ni60/WC/Cu directionally structured composite coatings were prepared using a combined process of flame spraying, induction remelting, and directional cooling. The electrochemical corrosion characteristics and immersion corrosion performance of the coatings was evaluated in a 3.5 wt.% NaCl solution, and the corrosion behavior of the coatings was discussed.The results indicated that all coatings exhibit typical activation-passivation-transpassivation corrosion characteristics in the 3.5 wt.% NaCl solution, with their electrochemical impedance spectra showing distinct capacitive behavior. The polarization resistance (Rp) and charge transfer resistance (Rct) of the coatings initially increase and then decrease with increasing Cu content (1 wt.%~5 wt.%), and the corrosion resistance of the coatings showed a trend of first increasing and then decreasing. The 3 wt.%Cu/10 wt.%WC coating demonstrate the most positive corrosion potential (Ecorr), the lowest corrosion current density (Icorr), and the highest Rct. The dense and uniform composite oxide passive film is formed on the coating surface composed of NiO, Cr2O3, Cu2O, and WO3, which effectively prevent further penetration and corrosion by Cl－, enabling the coatings to exhibit excellent corrosion resistance in the 3.5 wt.% NaCl solution.
ZHANG Zhi-xi
,
HAN Yan-bing
,
ZHANG Jia-yuan
,
ZHANG Peng
,
LI Fu-shun
,
DOU Xiu-wei
. The effect of WC/Cu on the corrosion resistance of Ni60 directionally structure coatings in 3.5 wt.% NaCl solution[J]. Journal of Lanzhou University of Technology, 2026
, 52(4)
: 10
-19
.
DOI: 10.13295/j.cnki.issn1673-5196.2026.04.002
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