Novel functional hybrid silica sol–gel coating for copper protection via in situ thiol–ene click reaction

Abstract

A novel anticorrosion coating, which crosslinks with inorganic bonds (Si–O–Si) and organic bonds (C–S–C), is prepared on copper through an in situ sol–gel method and thiol–ene click reaction. The hybrid sol solution containing mercapto and vinyl groups (MVFS) is prepared from hydrolysis and condensation of vinyltriethoxysilane (VTES), tetraethoxysilane (TEOS) and 3-mercaptopropyltrimethoxysilane (MPMS). The thiol–ene click reaction was initiated with a thermal initiator after the sol solution was applied on the copper surface. Various corresponding methods are carried out to investigate this novel coating's properties. Experimental results demonstrate that the formation of organic crosslinking bonds deriving from thiol–ene click reaction can enhance the protection performance of the MVFS material for copper.