Preparation of eco-friendly natural rosin-based SiO2–NH2@GO hybrid sealant and study on corrosion resistance of Fe-based amorphous coating for steel substrate

• Published in: Carbon (New York) 2023-01, Vol.201, p.170-188
• Main Authors: Wang, Guangyu, Zhou, Zehua, Hu, Qinghan, Shi, Xiangru, Zhang, Xin, Zhang, Kaicheng, Wu, Lintao
• Format: Article
• Language: English
• Subjects: adhesion; carbon; corrosion; Corrosion resistance; durability; Fe-based amorphous coating; Graphene oxide; hybrids; nanocomposites; Nature rosin; rosin; Sealant; sealants; Silica; sol-gel processing; steel; thermal degradation; thermal stability; volatile organic compounds
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/j.carbon.2022.09.008

Sealing treatment is an effective method to prolong the service life of Fe-based amorphous coatings for steel substrates. Common sealants always have the disadvantages of releasing amounts of volatile organic compounds (VOC) and are expensive, prompting researchers to develop an eco-friendly, low cost and high-performance sealant. However, their simultaneous improvement is restricted by some inevitable contradictions among them. Herein, natural rosin was introduced as a sealing material and an eco-friendly natural rosin-based SiO2–NH2@GO hybrid sealant was successfully prepared by the sol-gel method. In addition, the functional nanocomposite SiO2–NH2@GO was added to the hybrid sealant system to achieve the purpose of extending the service life of the sealant. The filling efficiency, adhesion, thermal stability and long-term corrosion resistance of hybrid sealants were investigated. The study showed that the adhesion of the hybrid sealant to the Fe-based amorphous coating was improved by 10.59% after adding the nanocomposite. The hybrid sealant reaches maximum thermal decomposition at 414.3 °C. The corrosion current density (icorr) of the sample NSG-0.5‰ still decreased by about two orders of magnitude after immersion for 672 h (0#, icorr = 1.39 × 10−4 A/cm2; NSG-0.5‰, icorr = 1.51 × 10−6 A/cm2). Full immersion experiments explore the failure process of hybrid sealants, where corrosion always tends to propagate with unmelted particles. The hybrid sealant prepared has the advantages of being eco-friendly and low cost, and provides a specific preparation process, which provides a new direction for the development of the sealant. The preparation process of nanocomposite SiO2–NH2@GO and sealed samples. [Display omitted]