Sol - Gel Prepared By The Material And Its Properties On Bronze Corrosion Closure Care

Bronze relic with high historical, artistic and scientific value, is one of the symbolizations of Chinese ancient civilization. Due to the reasons such as the long buried time, the change of the storage conditions after excavation, and so on, there exists a tough problem of preventing the ancient bronze relics from corrosion.In order to develop a new protective material for the bronze relics, in this article, the γ-glycidoxypropyltrimethoxysilane (GPTS) / methyltrimethoxysilane (MTMS) hybrid coatings on the bronze substrates were prepared by a sol-gel method using isopropanol as the solvent. The GPTS-MTMS hybrid was modified for the first time by the corrosion inhibitor benzotriazole (BTA) and other assistant agents. The effect of the hydrolysis temperature, the initial pH, and the content of water, GPTS and MTMS on the sol-gel transformation of the GPTS/MTMS system, and the effect of heat treatment on coating properties were investigated; the structure and performances of the GPTS/MTMS system were analyzed and tested by fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), the composition of coatings was studied via X-ray photoelectron spectroscopy (XPS) analysis; the protective abilities of the coatings on the simulated rusted bronze samples was studied by atomic absorption spectrometry (AAS). Then the coating was test for protection of the bronze relics excavated from Jinsha site near Chengdu.The results showed that the best sol system can be prepared at 80℃, when the initial pH is 4, n_GPTS+MTMS : n_H2O is 1 : 3, where n_GPTS : n_MTMS is 1 : 2; the suitable range of drying temperature for the GPTS/MTMS hybrid coatings is 80 ～ 100℃; the protective abilities of the coatings could be enhanced remarkably modified by BTA; the coating is mainly composed of C, Si, O, N and Cu, their state doesn't change before and after the modification, in the non-modified coatings used on the bronze substrate, the element Cu exists in the form of CuO, and in the BTA-modified coatings used on the bronze substrate, the element Cu exists in the form of CuSiO₃, with a remarkably enhanced concentration of Cu; the BTA-modified coatings have the best protective abilities on the simulated rusted bronze samples, where the concentration of the Cu of the dip solution is no other than 0.004mg/L for the GPTS/MTMS coatings with 0.1%BTA. Finally, the coating is proved to be effective for the bronze relics protection.This article provides a foundation for developing the GPTS-base organically...