4.5 Article

Fabrication of Superhydrophobic Zn-Ni Coatings on LA43M Magnesium Alloy

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SPRINGER
DOI: 10.1007/s11665-022-06670-2

关键词

corrosion resistance; Mg alloy; superhydrophobic; Zn-Ni coatings

资金

  1. Natural Science Foundation of Shaanxi Province of China [2018JM5024]

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Superhydrophobic Zn-Ni coatings with porous microstructures were prepared on LA43M Mg alloys substrate. The effects of Ce-2(SO4)(3) concentrations on the coating structure and wettability were studied. The results showed that the coatings had high contact angles and could effectively improve the corrosion resistance of magnesium alloys.
The superhydrophobic Zn-Ni coatings with porous microstructures were prepared on LA43M Mg alloys substrate by dynamic hydrogen bubble template method. The effects of Ce-2(SO4)(3) concentrations on the coating structure and wettability were studied. It was found that the contact angle of superhydrophobic coatings could be up to 157.4 +/- 0.7 degrees by changing concentrations of cerium sulfate in baths. XRD revealed that the coatings with porous microstructures mainly consisted of gamma-Ni5Zn21, delta-Ni3Zn22, and CeNi5. Polarization measurements demonstrated that corrosion current density value of 6.0 x 10(-7) A cm(-2) of the coating was lower than that of the substrate, which means that the coatings are effective to improve the anti-corrosion performance of LA43M magnesium alloys. EIS showed that the coating served as a barrier to resist charge transfer. The study provides a new means to develop coatings with superhydrophobic performance on the LA43M magnesium alloys surface, which is in favor of the application of Mg alloys.

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