Abstract
Benzotriazole (BTA) inhibitor was coated in mesoporous silica nanoparticles (MSNs) by tannic acid complex (TAC) deposition. The tannic acid complex film was used as a pH control release valve, which could sensitively feedback and control the release of BTA. MSNs-BTA@TAC was added to the organic–inorganic composite coating, a self-healing coating with pH feedback sensitivity and corrosion compensation function was prepared. The results of electrochemical impedance spectroscopy (EIS) showed that the organic/inorganic composite coating containing 2 wt% MSNs-BTA@TAC nanoparticles showed obvious self-healing effect after soaking in simulated body fluids for 20 days, and its low-frequency impedance modulus increased from 4.9 × 104 Ωcm2 to 9.2 × 105 Ωcm2. The long-term corrosion resistance and self-healing effect of the coating were verified in simulated body fluids.
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