Research On The Preparation And Anti-corrosion Performance Of Smart Coatings Based On MOF

Epoxy resin coating is a commonly used ruetal anti-corrosion method.Nevertheless,the epoxy resin will produce a large amount of micropores and cracks during the process of curing.In order to enhance the anti-corrosion property of epoxy coating,smart coating is a major topic in current research.The smart coating can improve the anticorrosive property of epoxy coating.The anti-corrosion mechanism is that it can release the remediation agent or corrosion inhibitor to protect the coating according to environmental changes,which is equivalent to the mechanism of drug release.Metal organic frameworks(MOF)are often used as containers for encapsulating drugs owing to its advantage of extraordinary permanent porosity and high surface area.And MOF can improve the anticorrosive property of epoxy coating.In this paper,the metal-organic frameworks,as corrosion inhibitor(BTA)hosts,were added in the epoxy resin to prepare the smart coatings.And corrosion protection property of epoxy coating of adding modified MOF by nanometer material and smart coatings are evaluated.The specific contents of this dissertation as follows:(1)The copper-based metal-organic frameworks(Cu-MOF)were prepared on the basis of CuC12 and 1,3,5-benzenetricarboxylic acid.The BTA was loaded in Cu-MOF to obtain the BTA-Cu-MOF material.The BTA-Cu-MOF/EP smart coatings are prepared by adding the BTA-Cu-MOF in the epoxy resin.The cerium-based metal-organic frameworks(Ce-MOF)were prepared on the basis of CeC13 and phthalic acid.Ce-MOF,as corrosion inhibitor(BTA)hosts,were added in the epoxy resin to prepare the Ce-MOF@TEOS/EP smart coatings.NH2-Ce-MOF was prepared on the basis of CeC13 and 2-aminophthalic acid and was modified by GO to prepare GO-Ce-MOF.Adding the GO-Ce-MOF in epoxy resin prepare the GO-Ce-MOF/EP coating.(2)The BTA-Cu-MOF,Ce-MOF@TEOS and GO-Ce-MOF material were charactered by field emission scanning electron microscope(FE-SEM),energy dispersive spectroscopy(EDS),Fourier-transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),and X-ray photoelectron spectroscopy(XPS).The release rate of BTA encapsulated in BTA-Cu-MOF and Ce-MOF@TEOS were charactered by UV-vis spectroscopy(UV-vis).Dispersibility of all material in epoxy resin was charactered by SEM.The corrosion protection properties of BTA-Cu-MOF/EP,Ce-MOF@TEOS/EP and GO-Ce-MOF/EP coating were tested using the electrochemical impedance spectroscopy(EIS)and water contact angle(WCA).(3)Conclusion:firstly,the Cu-MOF was successfully prepared.About 13 wt%BTA was load in Cu-MOF material.And BTA-Cu-MOF can uniformly release BTA.The BTA-Cu-MOF can uniformly disperse in the epoxy coating.BTA-Cu-MOF/EP smart coating can release BTA to protect metals and more excellent corrosion resistance than the Cu-MOF/EP and pure EP coating.The optimum dosage of BTA-Cu-MOF was 2 wt%in the epoxy coating.Second,Ce-MOF and Ce-MOF@TEOS were successfully prepared.Ce-MOF@TEOS material could uniformly release BTA at pH=3 and disperse in epoxy resin.Ce-MOF@TEOS/EP smart coating could release BTA.Ce-MOF@TEOS could enhance corrosion resistance and anti-corrosion time of the Ce-MOF/EP and pure EP coating at PH=3 of 3.5 wt%NaCl solution.The optimum dosage of Ce-MOF@TEOS was 3 wt%.Third,NH2-Ce-MOF was successfully modified by GO.The dispersivity of GO-Ce-MOF was more excellent than GO and NH2-Ce-MOF material.GO-Ce-MOF material could reinforced the corrosion protection properties of epoxy coating and extend the anticorrosion time of the coating.The optimum dosage of GO-Ce-MOF was 2 wt%in the epoxy coating.