<Emphasis Type="Italic">In-situ</Emphasis> polymerized nanosilica/acrylic/epoxy hybrid coating: Preparation,microstructure and properties |
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Authors: | HongBin Lu MinHao Gu JianFeng Huang Yong Hu XiangKang Meng |
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Affiliation: | (1) National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing, 210093, China |
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Abstract: | An in-situ polymerization method was employed to synthesize the nanosilica/acrylic/epoxy (SAE) hybrid coating on AISI 430 stainless
steel (430SS), as compared with a traditional blending method. Microstructures of the blending SAE hybrid coating (BC) and
in-situ SAE hybrid coating (ISC) were characterized by transmission electron microscopy (TEM). Corrosion resistance of BC
and ISC on 430SS was evaluated by the neutral salt spray test and potentiodynamic polarization technique. Failure mechanism
of the BC on 430SS was suggested by the microstructures and corrosion behaviors. Serious aggregation of nanosilica particles
in the BC impairs its structural uniformity and induces the flaws formation. These flaws in the BC initiates the failures
of pitting, filiform corrosion and peeling which are accelerated by the O2 concentration cell and H+ self-catalysis in chlorine-containing moist environments. The ISC-coated 430SS shows a more advantageous corrosion resistance
than that of the BC-coated. The ISC-coated 430SS can suffer the salt spray over 1000 h. Besides, it exhibits a high corrosion
potential beyond 0.925 V and good passivation characteristics during the potentiodynamic polarization.
Supported by the National Basic Research Program of China (“973” Program) (Grant No. 2004CB619305) and the National Natural
Science Foundation of China (Grant No. 50571044) |
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Keywords: | in-situ polymerization hybrid coating 430 stainless steel (430SS) corrosion resistance failure mechanism |
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