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Article Abstract
An anticorrosive coating with randomly distributed passive barriers and regionally enriched active corrosion inhibitors is developed by integrating mica nanosheets (MNSs) and magnetic-responsive core-shell mesoporous nanoparticles with 2-mercaptobenzothiazole (FeO@mSiO/MBT) under magnetic field incubation. The bottom enriched FeO@mSiO/MBT rapidly releases the MBT to form a passivation layer on corrosion sites, enhancing the corrosion inhibition efficiency by 30.36% compared with the control (NPEP-R). The impedance modulus || of the sample (NP/MNS/EP) increases by five orders of magnitude compared with that of its control (NP/MNSEP) after 30 days of corrosion immersion. NP/MNS/EP exhibited the lowest corrosion rate (3.984 × 10 mm/year) as compared to the other samples. Notably, the coating in a fractured state still maintains superior corrosion inhibition even after 40 day salt spray testing. The differentiated distribution of nanofillers was well confirmed by optical microscopy and SEM-EDS, and the synergistic effect of the active/passive integrated anticorrosive coating with merits of both comprehensive protection and fast responsiveness was systematically explored.
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