Silane based sol–gel coatings are of increasing interest as anti-corrosion materials because they combine properties of the organic polymeric material and properties of the inorganic ceramic. The inorganic components can provide good anti-abrasion, durability and adhesion to metal surface. The organic component can give good flexibility, density and functional compatibility with organic paint systems. Moreover, the compositions of these hybrid coating materials can range from almost inorganic to almost organic. Thus it can get required performances by controlling the ratio of inorganic and organic component.

Prof. Xuedong Wu’s group from Ningbo Institute of Materials Technology and Engineering, CAS, has achieved a series of anti-corrosion coatings by adjusting precursor, catalyst and additive agent of sol-gel coatings. The influence of thiurea and benzotriazole on the performance of epoxy functionalized silica sol-gel coating on copper surface was investigated and reported in Surf. Coat. Technol. 213 (2012) 175-92 and  Appl. Surf. Sci. 276(2013) 284-90; the study results about performance of mercapto functional hybrid silica sol-gel coating was published in Surf. Coat. Technol. 251 (2014) 135-142 and preparation of anticorrosion sol-gel coating using novel catalyst was reported in J. Sol-Gel Sci. Technol. (66)2013 133-8. Moreover, three patents were applied (CN20131000584.4, CN201210289635.9, CN201310041683.0)

Recently, a novel anticorrosion coating, which crosslinks with inorganic bonds (Si–O–Si) and organic bonds (C–S–C), was prepared on copper through an in situ sol–gel method and thiol–ene click reaction. Related result was published in RSC Adv. (30) 2014 15776-15781. 

EIS plots of coated and bare copper samples in 3.5 wt.% NaCl solution

Prof. Xuedong Wu xdwu@nimte.ac.cn

Research Staff Url: http://english.nimte.cas.cn/pe/fas/200909/t20090929_44484.html

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Scheme of coating formation via sol-gel method and thiol–ene click reaction