Fabrication and Corrosion Resistance of a Superhydrophobic Ni-P/Ni₃(NO₃)₂(OH)₄ Multilayer Protective Coating on Magnesium Alloy.

The results show that the electroless Ni–P coating on the magnesium alloy exhibits a nodular structure with micropores and lower corrosion resistance. However, a dense Ni 3 (NO 3 ) 2 (OH) 4 layer, a porous Ni 3 (NO 3 ) 2 (OH) 4 nanostructure layer, and a stearic absorbing layer are grown on the surface of the Ni–P coating with superhydrophobic characters and higher corrosion resistance after hydrothermal treatment. Furthermore, the water contact angle and corrosion resistance of the multilayer coating showed a trend of first increasing and then decreasing as the hydrothermal reaction time increases.

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