pH-responsive corrosion protection of chitosan-coated hollow mesoporous silica microspheres loaded with 2-mercaptobenzothiazole coating on copper substrates

Abstract

An active protection coating for pH-responsive was prepared. The hollow mesoporous silica microspheres (HMSNs) were loaded with 2-mercaptobenzothiazole (MBT), and then they were coated with chitosan (CS). The composite microspheres were in the range of 650–750 nm in diameter. CS-HMSN-MBT coating had a faster repair rate under acidic conditions by synergistic effect between CS and MBT. The repair rate under alkaline conditions was slowed down. The active protection performance reached the strongest after 3 d immersion. The corrosion inhibitor release mechanism was optimized to extend the service life of the coating and to achieve long-term service of the copper substrate.

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