JOURNAL OF APPLIED POLYMER SCIENCE
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2020
·Vol. 137
·期 45
·49405
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IF 2.52
Yankun Xie,Weiqu Liu,Liyan Liang,Chunhua Liu,Maiping Yang,Hongyi Shi,Shuo Wang,Fengyuan Zhang
In this study, the silica network and functionalized graphene oxide (GO) were incorporated into the epoxy coating systems, which was aimed to improve the thermal property and corrosion resistance of epoxy coatings. First, tetraethyl orthosilicate (TEOS) oligomers and epoxy hybrid was fabricated through sol–gel method. Then the (3-aminopropyl) triethoxysilane (APTES) modified graphene oxide (FGO) was added into the epoxy hybrid composite to obtain anticorrosion coatings. Fourier transform infrared spectroscopy, thermogravimetric analysis (TGA), Raman spectrum, and X-ray photoelectron spectrum were conducted to evaluate the structural information of GO and APTES modified GO nanosheets. The results indicated that the APTES successfully grafted onto the surface of GO sheets. Besides, TGA curves, electrochemical measurements and salt spray test were also carried out to characterize the thermal performance and corrosion resistance of GO based epoxy coatings. The TGA results revealed that the thermal performance of epoxy coating containing silica network and FGO nanofiller (ES/FGO) was significantly strengthened compared to pure epoxy. The initial degradation temperature of epoxy coating was increased from 300 to 343.7°C after incorporation of silica component and FGO. The EIS measurements demonstrated that the impedance modulus of ES/FGO was significantly higher than neat epoxy, which indicated that the corrosion resistance of epoxy was substantially strengthened after introduction of silica component and FGO. The corrosion rate and inhibition efficiency of epoxy composite coatings were also shifted from 1.237 × 10 −7 mm/year and 76.6% (for neat epoxy) to 1.870 × 10 −9 mm/year and 99.6% (for ES/FGO), respectively. The salt spray test also revealed that the silica and FGO can improve the corrosion resistance of epoxy coating. Additionally, the dispersion of GO sheets was also enhanced after the modification of APTES siloxane.
研究领域:
材料科学
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化学工程
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腐蚀科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Wen Xu,Di Su,Dongbin Yang,Mengjie Qiu,Jiandu Lei,Jing Liu
In this study, the In 2 O 3 -carbonization wood (In 2 O 3 -CW) composites were prepared using waste poplar wood through a comprehensive process involving “delignification-bleaching-impregnation-carbonization”. The morphology, crystal structure, elemental chemical state and photocatalytic activity of In 2 O 3 -CW were investigated by SEM, HRTEM , BET, XRD , XPS , UV–vis DRS, PL , EIS , ESR , TOC and LC-MS. Malachite green (MG) served as a model organic pollutant to assess the adsorption and visible-light photocatalytic performance of In 2 O 3 -CW in dye degradation. The results indicated a significant enhancement in the adsorption-photocatalytic performance of In 2 O 3 nanoparticles loaded with biomass, leading to a significant increase in the MG degradation rate from 24 % to 76 %. Specifically, when the concentration of MG was 100 mg·L −1 , 20 mg of 0.5In 2 O 3 -CW removed more than 96 % of MG to 481 mg·g −1 . The negatively charged surface of In 2 O 3 -CW was observed to be effective in adsorbing MG molecules. Moreover, In 2 O 3 -CW exhibited a narrow band gap, high photocatalytic activity, and excellent light harvesting ability, facilitating enhanced photogenerated electron-hole separation and the generation of potent active substances ( OH and O 2 − ). Given this knowledge, a detailed deduction of the dye discoloration mechanism was presented, offering a novel approach for the effective treatment of dye wastewater pollution and the realization of high-value applications for waste biomass resources from agriculture and forestry.
研究领域:
环境科学
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材料科学
·
化学工程
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Yue Liu,Feng Peng,Guang-Ling Yang,Zhi-Hui Xie,Wenxin Dai,Yuejun Ouyang,Liang Wu,Chuan-Jian Zhong
The utilization of photoelectrochemical cathodic protection (PECCP) enables an indirect corrosion protection of metals with low self-corrosion potential by introducing a metallic nickel interlayer. However, the ability to enhance the PECCP efficiency remains challenging because of the inherent property of the semiconductor. Herein, this ability is demonstrated by coupling a covalent organic framework (TpBD) decorated TiO 2 photoanode (TiO 2 /TpBD) with nickel coating on magnesium alloy for an effective corrosion protection. The composite photoanode showed direct PECCP for the nickel interlayer and indirect corrosion protection of the magnesium alloy. The composite structure of the nanotube array and the covalent organic framework for the photoanode were confirmed by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The enhanced photoelectrochemical conversion capability and PECCP performance of the nickel-coated Mg alloy were evidenced by the results from electrochemical and photoelectrochemical measurements including Mott-Schottky curves, photoinduced potential variations, and electrochemical impedance spectroscopy (EIS). Lastly, a corrosion protection mechanism is proposed, where the enhanced PECCP efficiency is attributed to the formation of a direct Z-scheme heterojunction, which is substantiated by the results from valence band (VB) XPS and electron spin resonance characterizations.
研究领域:
材料科学
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电化学
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腐蚀科学
·
光电化学
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Rui Fang,Runjia Liu,Zhi-Hui Xie,Liang Wu,Yuejun Ouyang,Mingqi Li
To improve the corrosion protection of a nickel-based coating to the underlying magnesium alloy , a superhydrophobic nickel‑phosphorus/nickel/fluorinated polysiloxane (PFDTMS) triple-layer composite coating was successfully designed and fabricated on AZ31 magnesium alloy . The composite coating consists of an electroless-deposited nickel‑phosphorus (ELNi) bottom layer, an electrochemically deposited nickel (ECNi) nano-cone array middle layer, and a PFDTMS top layer via a dehydration-condensation reaction of silane . The surface morphology , structure, and chemical composition of the coating are identified by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The static water contact angle (WCA) of the composite coating is 153.0 ° ± 4.6 ° , attributed to the synergistic effect between nano-cone-shaped nickel and PFDTMS layer. Compared to the untreated magnesium alloy, the corrosion current density of the coating decreases by four orders of magnitude based on the Tafel curve, and the corresponding impedance modulus at low frequency (| Z | ƒ=0.01 Hz ) increases by almost four orders of magnitude based on the electrochemical impedance spectra (EIS), demonstrating the superior corrosion protection to magnesium alloy. Lastly, the wetting states of the water droplets on the nickel‑phosphorus layer with and without electrodeposition of nickel nano-cone array and silane modification are also discussed in detail.
研究领域:
材料科学
·
腐蚀工程
·
表面工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）