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Hydrophobic epoxy resin coating with ionic liquid conversion pretreatment on magnesium alloy for promoting corrosion resistance

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Journal of Materials Science & Technology 2020年第2期37卷 9-18页

作者： Liting Guo Changdong Gu Jie Feng Yongbin Guo Yuan Jin Jiangping Tu School of Materials Science and Engineering State Key Laboratory of Silicon MaterialsZhejiang UniversityHangzhou310027China Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province Hangzhou310027China college of Materials Science&Engineering Zhejiang University of TechnologyHangzhou310014China zotye automobile co.ltd Hangzhou310018China

A hydrophobic epoxy resin coating with an environmental-friendly deep eutectic solvent(DES)-based conversion pretreatment was proposed to enhance the corrosion resistance of magnesium *** hydrophobic epoxy resin coatings on the AZ31B magnesium alloy with and without the DES-based conversion pretreatment were thoroughly *** is found that the DES-based conversion film on the AZ31B magnesium alloy is mainly composed of MgH2,MgO and ***,the conversion film possesses porous structure,which provides more anchor points for the following epoxy resin ***,without the DES-conversion pretreatment,the epoxy resin is difficult to be attached on the substrate during the dip-coating *** double layered hybrid coating system promotes the corrosion resistance of the magnesium alloys significantly,which can be ascribed to the unique architecture and component including the hydrophobicity of the surface layer,the dense and interlocked epoxy resin,and the corrosion resistant DES-based conversion pretreatment.

关键词： Mg alloy Deep eutectic solvent corrosion resistance Double layered hybrid coating

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controlled synthesis of nanosized Si by magnesiothermic reduction from diatomite as anode material for Li-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2020年第4期27卷 515-525页

作者： Li-fen Guo Shi-yun Zhang Jian Xie Dong Zheng Yuan Jin Kang-yan Wang Da-gao Zhuang Wen-quan Zheng Xin-bing Zhao State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province Hangzhou 310027China Hangzhou Branch Zhejiang Zotye Automobile Corporation LimitedHangzhou 310018China Shanghai Han Xing Science and Technology co. Ltd.Shanghai 201322China

Li-ion batteries(LIBs)have demonstrated great promise in electric vehicles and hybrid electric ***,commercial graphite materials,the current predominant anodes in LIBs,have a low theoretical capacity of only 372 mAh·g?1,which cannot meet the everincreasing demand of LIBs for high energy *** Si is considered an ideal form of Si for the fabrication of LIB anodes as Si–C *** of nanoscale Si in a facile,cost-effective way,however,still poses a great *** this work,nanoscale Si was prepared by a controlled magnesiothermic reaction using diatomite as the Si *** was found that the nanoscale Si prepared under optimized conditions(800°C,10 h)can deliver a high initial specific capacity(3053 mAh·g?1 on discharge,2519 mAh·g?1 on charge)with a high first coulombic efficiency(82.5%).When using sand-milled diatomite as a precursor,the obtained nanoscale Si exhibited a well-dispersed morphology and had a higher first coulombic efficiency(85.6%).The Si–C(Si:graphite=1:7 in weight)composite using Si from the sand-milled diatomite demonstrated a high specific capacity(over 700 mAh·g?1 at 100 mA·g?1),good rate capability(587 mAh·g?1 at 500 mA·g?1),and a long cycle life(480 mAh·g?1 after 200 cycles at 500 mA·g?1).This work gives a facile method to synthesize nanoscale Si with both high capacity and high first coulombic efficiency.

关键词： silicon anode magnesiothermic reduction diatomite Li-ion batteries

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