109 / 2020-09-17 18:51:49

功能化层状双金属氢氧化物的合成及其增强防腐涂层

离子交换

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.