Layered double hydroxide (LDH) with NO 2 − intercalation was successfully prepared via acidification oscillation
and ion exchange. The nano-fillers were incorporated into the resin to prepare anti-corrosion coatings with the
thickness of ca. 50 ± 5 μm. The electrochemical and self-repairing properties of the LDH-doped coatings were
studied by EIS and LEIS. Results indicated that the addition of LDH loaded with nitrite induced obvious increased
in the impedance of coating (from 4.64 ×10 8 Ω cm 2 to 2.14 × 10 10 Ω cm 2 ) and improved the anticorrosion
performance of the coating. In addition, the localized corrosion of coatings could be largely inhibited, and the
released nitrite ions from LDH interlayers exhibited active anticorrosion functions. When LDH nanosheets were
added to the coatings, the lamella structures improved the barrier performances of the coatings. At the same
time, the excellent ion exchanges ability of LDH could be used as storage stations for chloride ions, and the
release of nitrite ions could play an active anti-corrosion role. Both of them cooperated to synergistically im-
prove the anti-corrosion performance of the coating.

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