Self-Reporting and Self-Healing Dual Functional Anticorrosive Coating based on Tannic Acid Additives
Tannic acid molecules are loaded into mesoporous silica nanoparticles(TA-MSNs)by one-step synthesis method to endow them with corrosion sensing and corrosion inhibition dual functions.TA-MSNs are added into the epoxy coatings to ex-plore the self-reporting and self-healing performances of composite coatings.Firstly,the coloration and corrosion inhibition properties of TA are characterized.Then,the morphology and structure of TA-MSNs are investigated,and the release behaviors of TA from TA-MSNs studied.The influence of nanofiller content on the self-reporting and self-healing performances of coatings is comprehensively analyzed.Salt spray test indicates that the self-reporting effect of the coating is positively correlated with the filler content,and the addition of more than 5％(w)TA-MSNs could give the coating obvious coloration effect.Electro-chemical measurement and surface analysis show that the low-frequency impedance modulus(|Z|001 Hz)of the damaged coating with 5％TA-MSNs is two orders of magnitude higher than that of the damaged blank epoxy coating.When the coating is dam-aged,TA molecules released in the coating can be complexed with Fe3+formed during steel corrosion,resulting in blue-black coloration for corrosion reporting,and the complex adsorbed on the metal surface can form a protective film layer to inhibit fur-ther corrosion reaction.In summary,the epoxy coating with 5％TA-MSNs possesses excellent self-reporting and self-healing performance.
NETL
NSTL
万方数据
