Purpose
The purpose of this paper is to prepare a dual-encapsulated halloysite nano-container to release the capsuled inhibitor as an additive for corrosion protection of epoxy coating.
Design/methodology/approach
Halloysite nano-containers (HNT) were prepared by simultaneously implanting inhibitor benzotriazole (BTA) into the inside and outside of the halloysite using reduced pressure and layer-by-layer (LBL) assembly, respectively. The microstructure and morphology of treated HNT were investigated using Fourier transform infrared spectroscopy and transmission electron microscopy. In addition, the anti-corrosion behaviors of the composite polyepoxy coating with inhibitor-loaded nano-containers BTA@HNT-2 were investigated using the electrochemical impedance spectroscopy and neutral salt spray test.
Findings
Test results showed that the LBL assembly structure of the halloysite nano-container makes the BTA@HNT-2 nano-container be controlled and sustained to release BTA, relying on the pH. Very importantly, the obtained nano-container is also responsive to temperature, owing to the thermosensitivity polyelectrolyte out-shell of the HNT. The result showed Rct of the composite polyepoxy coating can be sufficient to maintain higher than 8.510E+7 Ω·cm2 over 72 h of immersion test. Moreover, the artificial induced defects on the coating surface were sufficiently inhibited in the presence of BTA@HNT-2 nano-container in the polyepoxy coating.
Originality/value
Use of the BTA@HNT-2 as corrosion inhibitor nano-container, with good anti-corrosion property and dual-responsive to pH and temperature, offers a significant rout to prepare smart anti-corrosion coating for protecting metal substrate.
The molecule of the title compound, [Sn(C6H5)2Cl2(C13H12OS)2], has crystallographic twofold symmetry. The SnIV atom is six-coordinate within a distored octahedral geometry defined by a C2Cl2O2 donor set.
Key indicators: single-crystal X-ray study; T = 295 K; mean (C-C) = 0.005 Å; R factor = 0.033; wR factor = 0.077; data-to-parameter ratio = 17.2.In the title compound, [Sn(C 6 H 11 ) 2 (C 13 H 15 NO 4 )], the Sn atom is five-coordinate and adopts a distorted trigonal-bipyramidal
Key indicators: single-crystal X-ray study; T = 295 K; mean (C-C) = 0.008 Å; disorder in main residue; R factor = 0.040; wR factor = 0.097; data-to-parameter ratio = 17.8.The Sn IV atom of the title compound, [Sn(C 4 H 9 ) 2 (C 13 H 14 Cl-NO 3 )], adopts a distorted SnNC 2 O 2 trigonal-bipyramidal geometry with a mean Sn-C distance of 2.105 Å and with Sn-O = 2.107 Å , and forms five-and six-membered chelate rings with the tridentate ligand. One butyl group is disordered over two positions with site occupancies of 0.65 (1):0.35 (1). (2004, 2006, 2007, 2009).
Related literature
ExperimentalCrystal data
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