Study on the Corrosion and High‐Temperature‐Resistant Coating for In Situ Crosslinking Reaction Catalyzed by a Special “Egg Inlaid Egg Tray” Structure

Abstract

A new type of water corrosion‐resistant coating which is similar to the “egg inlaid egg tray” structure is successfully prepared. Modified chitosan (MCS) and graphene oxide (GO) are crosslinked with waterborne epoxy resin to form a unique 3D “tray” hybrid structure, and the crosslinking reaction is catalyzed by modified nano‐SiO2 (MSiO2) with an egg‐like morphology. The uniformly dispersed MSiO2 can provide crosslinking reaction sites and is firmly “fixed” in the composite coating, thus not only catalyzing the crosslinking reactions with good performance, but also improving the interaction between itself and the as‐formed GO‐MCS structure. Consequently, with the help of “fixed catalytic in situ crosslinking reactions” and synergistic effect between MSiO2 and GO‐MCS, the coating not only shows an improved corrosion resistance with a large impedance modulus at low frequency (|Z|0.01 Hz) of 1.8 × 106 Ω cm2, but also possesses good thermal stability and high hydrophobicity. The protective effect of the composite coating on the substrate is more comprehensive and multiple.