Ionic modification of graphene nanosheets to improve anti-corrosive properties of organosilicon composite coatings

Kai Yao; Hongxia Zhu; Yulu Wang; Rong Luo; Liqiang Jin; Lefu Xie; Zhigang Tian

doi:10.1039/d3ra00951c

Ionic modification of graphene nanosheets to improve anti-corrosive properties of organosilicon composite coatings

RSC Adv. 2023 Mar 23;13(14):9530-9538. doi: 10.1039/d3ra00951c. eCollection 2023 Mar 20.

Authors

Kai Yao¹, Hongxia Zhu¹, Yulu Wang¹, Rong Luo¹, Liqiang Jin¹, Lefu Xie², Zhigang Tian²

Affiliations

¹ State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences) Jinan 250353 Shandong P. R. China hxzhu@qlu.edu.cn.
² New Era Chemical Shandong Limited Liability Company Weihai 264200 Shandong P. R. China.

Abstract

Composite coatings with anti-corrosive properties were fabricated using quaternized silicone oil modified graphene oxide and silicone polymer. Quaternized silicone oil was successfully synthesized through copolymerization of octamethyl cyclotetrasiloxane (D4), chloropropylsilane and triethylamine. The quaternized silicone oil modified graphene oxide (M-GO) was characterized by using ¹H NMR, FT-IR, Small-angle X-ray scattering (SAXS), Thermogravimetry (TG) and Transmission electron microscopy (TEM). The results showed that the M-GO was formed successfully. The M-GO could be dispersed without aggregation in some organic solvents, and the concentration of M-GO could be up to 3 mg ml^-1. The M-GO-reinforced silicone composites exhibited obvious improvements in thermal stability, mechanical properties and especially anticorrosive properties with the highest E _corr (-121 mV) and the lowest I _corr (6.058 × 10^-9 A cm^-2), and the protection efficiency of the matrix could reach 99.97%. The anticorrosive mechanism of the fabricated composite coatings was investigated. This work provides a ready strategy for modification of GO and fabrication of high performance graphene-based silicone composite materials.