Enhanced long-term corrosion resistance of Mg alloys by superhydrophobic and self-healing composite coating

•Novel hybrid coating is fabricated with superhydrophobic and self-healing features.•Anti-corrosion feature is maintained for 80 days immersion in 3.5 wt% NaCl.•Incorporation of [OTP][NTf2] offers the self-healing as well as anti-corrosion.•Synergistic cooperation of various constituents results in the outstanding feature.