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Superhydrophobic and corrosion-resistant siloxane-modified MgAl-LDHs coatings on magnesium alloy prepared under mild conditions

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 450-463页

作者： Wenxi Zhang Zhangzelong Zhuo Dan Xu Liang Wu Zhihui Xie Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China College of Materials Science and engineering/national engineering research Center for magnesium alloys Chongqing UniversityChongqing 400044China

We have developed a superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating on the surface of Mg *** composite comprised a tungstate-intercalated(LDH-W)underlayer that was grown at low temperature(relative to hydrothermal reaction conditions)under atmospheric pressure and an outer polysiloxane layer created from a solution containing perfluorodecyltrimethoxysilane(PFDTMS)using a simple immersion *** successful intercalation of tungstate into the LDH phase and the following formation of the polysiloxane layer were confirmed through X-ray diffraction(XRD),Fourier transform infrared(FTIR)spectroscopy,and X-ray photoelectron spectroscopy(XPS).The corrosion resistance of the LDH-W film,both before and after the PFDTMS modification,was evaluated using electrochemical impedance spectroscopy(EIS),Tafel curves,and immersion *** results showed that Mg coated with LDH-W/PFDTMS exhibited significantly enhanced corrosion protection compared to the unmodified LDHW film,with no apparent signs of corrosion after exposure to 3.5wt%NaCl solution for 15 ***,the LDH-W/PFDTMS coating demonstrated superior superhydrophobicity and self-cleaning properties against water and several common beverages,as confirmed by static contact angle and water-repellency *** results offer valuable insights into preparing superhydrophobic and corrosion-resistant LDH-based composite coatings on Mg alloy surfaces under relatively mild reaction conditions.

关键词： Mg alloy corrosion coating layered double hydroxide

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Mechanical properties and microstructures of Mg-6Si alloys fabricated using the tungsten-inert-gas arc additive manufacturing

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China Foundry 2025年

作者： Peng-cheng Zhou Guo-qiang You Jin-yu Feng Lei Wang Xiao Lin Bin Jiang College of Materials Science and engineering Chongqing University national engineering research Center for magnesium alloys Chongqing University national Key Laboratory of Advanced Casting Technologies Chongqing University

Si-containing Mg alloys solidified at conventional rates often contain coarse and sharp Mg2Si phases,which can result in inferior material *** this study,Mg-6wt.%Si （Mg-6Si） alloy was prepared by wire arc additive manufacturing （WAAM）,employing the gas tungsten arc welding technique with rapid *** microstructures and mechanical properties of the WAAM alloy were investigated and compared with those of the as-cast samples produced using a metal *** results indicate that the WAAM Mg-6Si is harder and stronger than the as-cast *** microhardness of the WAAM Mg-6Si increases by 36.6%in comparison to that of as-cast Mg-6Si ***,the average tensile strengths at room temperature and 150°C increases by 63.4%and 21.3%,*** refines both the Mg2Si phase and the overall grains,resulting in a homogeneous morphology and improved mechanical *** granular Mg2Si phase,characterized by fine particles with a diffused distribution,shows a significant increase in *** acicular Mg2Si phase is distributed along the grain boundaries,and its concentration significantly *** average grain size of the Mg2Si phase is about 9.20μm,about 5 times *** refinement and distribution of the granular Mg2Si phase,as well as the reduction in the amount of needle-like Mg2Si particles,are the key factors for improving the mechanical properties of WAAM Mg-6Si alloy.

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Effect of Ce-rich misch metal addition on squeeze cast microstructure and mechanical properties of AZ81 alloy

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中国有色金属学会会刊：英文版 2008年第A01期18卷 44-49页

作者：廖慧敏龙思远郭存宝朱志兵 College of Mechanical engineering Chongqing University national engineering research Center for magnesium alloys

The effect of cerium-rich misch metal addition on the microstructure and properties of squeeze cast magnesium alloys AZ81 was empirically *** results indicate that the addition of cerium-rich misch metal modifies the microstructure *** the increase of the RE addition,the amount of Mg_(17)Al_(12) decreases while that of Al_(11)(RE)_3 increases,accompanied by grain *** the addition reaches 1.5%,the grain refinement becomes ***,when the addition exceeds 2.0%, Al_(11)(RE)_3 phase coarsens into rod shape and the grain size *** tensile properties of the AZ81 at both room temperature and 150℃increase with the addition,and reach their optimal values with the addition of 1.5%.Further increase of the addition to above 2.0%decreases the tensile properties *** tensile fracture of the alloy is characterized by the cleavage of the brittle second phases and ductile dimples of the matrix.

关键词： AZ81合金挤压微观结构金属合金

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Hot compression deformation characteristics of Mg-Mn alloys

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Transactions of Nonferrous Metals Society of China 2010年第10期20卷 1841-1845页

作者：方超张静廖爱林薛绍展袁付庆潘复生 College of Materials Science and engineering Chongqing University national engineering research Center for magnesium alloys

The hot deformation behaviors of solution treated Mg-1.8Mn-0.4Er-0.2Al alloys were investigated by means of compression tests on Gleeble-1500 in strain rate range of 0.01-10s-1,deformation temperature range of 250-450℃ and a true strain of *** constitutive relationships among flow stress,strain rate and deformation temperature were described by Arrhenius-type equations,based on the fact that the material constants could be calculated under a wide range of *** results show that the flow stress of the experimental alloy decreases with temperature increasing and strain rate *** the experimental conditions,the products of constant α and n in the constitutive equation are stable within certain strains,and the deformation activation energy ranges from 160 to 220 kJ/*** is proved that the values of calculated flow stress are close to the experimental results with average error of 2.01%.

关键词： magnesium alloy thermal deformation flow stress constitutive equation

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Influence of impurities on microstructure and mechanical properties of ZK60 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2010年第7期20卷 1299-1304页

作者：潘复生毛建军陈先华彭建王敬丰 College of Materials Science and engineering Chongqing University national engineering research Center for magnesium alloys Chongqing University

The influence of impurity content on the microstructure and mechanical properties of ZK60 magnesium alloys was investigated by optical microscopy,scanning electron microscopy and tensile ***60 alloys were prepared by changing holding time of alloy melt during semi-continuous casting in order to control the content of impurity *** alloy with lower purity content is found to have less second precipitates and larger grain size in the as-cast ***,in the as-extruded state,reducing impurities brings about a decrease in grain size and an increase in yield strength from 244 MPa to 268 MPa,while the elongations in the as-extruded alloys with different contents of impurities are almost the *** T5 treatment,impurity content is found to have more obvious effect on the yield strength of ZK60 *** yield strength of ZK60-45 alloys with low impurity content is increased up to 295 MPa after T5 treatment.

关键词： ZK60 magnesium alloy impurities mechanical properties microstructure extrusion T5 treatment

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Hydriding/dehydriding properties of Mg-Ni-based ternary alloys synthesized by mechanical grinding

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Transactions of Nonferrous Metals Society of China 2010年第B07期20卷 624-629页

作者：陈玉安杨丽玲林嘉靖程绩潘复生 College of Materials Science and engineering Chongqing University national engineering research Center for magnesium alloys Chongqing University

The Mg-Ni-based ternary alloys Mg2-xTixNi(x=0,0.2,0.4)and Mg2Ni1-xZrx(x=0,0.2,0.4)were successfully synthesized by mechanical *** phases in the alloys and the hydriding/dehydriding properties of the alloys were ***2Ni and Mg are the main hydrogen absorption phases in the alloys by XRD *** kinetics curves of the alloys indicate that the hydrogen absorption rate increases after partial substitution of Ti for Mg and Zr for *** to the measurement of pressure-concentration-isotherms and Van't Hoff equation,the relationship between ln p(H2)and 1 000/T was *** is found that while increasing the content of correspondingly substituted elements at the same temperature,the equilibrium pressure of dehydriding increases,the enthalpy change and the stability of the alloy hydride decrease.

关键词： Mg-Ni-based hydrogen storage alloy mechanical grinding p-C-T measurement hydriding properties enthalpy change

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Effects of Sn addition on microstructure and mechanical properties of Mg-Zn-Al alloys

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Progress in Natural Science:Materials International 2017年第6期27卷 695-702页

作者： Bo Wang Xianhua Chen Fusheng Pan Jianjun Mao College of Materials Science and engineering Chongqing University national engineering research Center for magnesium alloys Chongqing University

The effects of Sn addition（0, 0.5, 1.0, 2.0 and 3 wt%） on microstructure of Mg-4Zn-1.5Al alloy in cast and extruded states were investigated, and the mechanical properties of as-extruded Mg-4Zn-1.5Al-xSn studied. The experimental results showed that the as-cast Mg-4Zn-1.5Al alloy was composed of two phases α-Mg and Mg;（Al, Zn）;, while Sn-containing alloys consisted of α-Mg, Mg;（Al, Zn）;and Mg;Sn phases, and Mg;（Al, Zn）;was not detected after extruding due to that the most of them dissolved into the matrix during the homogenized treatment. The addition of Sn refined the grains of as-cast and as-extruded Mg-Zn-Al alloys obviously. It was noted that the basal texture intensity reduced with increasing Sn content significantly in as-extruded Mg-Zn-Al alloys. The tensile tests results indicated that Sn addition improve the tensile strength of the extruded alloys,while it had a harmful effect on the ductility. When the addition of Sn was 2 wt%, the ultimate tensile strength（UTS）, yield strength（YS） and elongation（ε;） of the alloy were 280 MPa, 147 MPa and 17.4%, respectively.

关键词： magnesium alloys Sn addition Microstructure Texture Mechanical properties

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Influence of impurities on damping properties of ZK60 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2010年第7期20卷 1305-1310页

作者：陈先华毛建军潘复生彭建王敬丰 College of Materials Science and engineering Chongqing University national engineering research Center for magnesium alloys Chongqing University

The influence of impurities on damping capacities of ZK60 magnesium alloys in the as-cast,as-extruded and T4-treated states was investigated by dynamically mechanical analyzer at room *** and Lucke dislocation pinning model was employed to explain damping properties of the *** is found that reducing impurity content can decrease the amount of second-phase particles,increase grain size and improve damping capacity of the as-cast alloy *** as-extruded alloy with lower impurity content is found to possess obviously higher damping capacity in the relatively high strain region than that with higher impurity concentration,which appears to originate mainly from different dislocation *** variation tendency of damping property with change of impurity content after solution-treatment is also similar to that in the as-extruded and as-cast states. Meanwhile,the purification of the alloy results in an evident improvement in tensile yield strength in the as-extruded state.

关键词： ZK60 magnesium alloy impurities damping dislocation

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Tensile properties and microstructure of AZ31B magnesium alloy sheet processed by repeated unidirectional bending

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中国有色金属学会会刊：英文版 2010年第1期20卷 28-33页

作者：黄光胜李红成宋波张雷 College of Materials Science and engineering Chongqing University national engineering research Center for magnesium alloys Chongqing University

The mechanical properties of the AZ31B magnesium alloy sheet processed by repeated unidirectional bending (RUB) with a basal pole tilted in the rolling direction were systematically investigated at different temperatures. Compared with the as-received sheet exhibiting approximately the same average grain size, the fracture elongation increased while the proof stress decreased at room temperature. The initial texture had a significant influence on the mechanical properties at room temperature, while it showed a much weaker effect on the mechanical properties because of the activation of non-basal slips and initiation of dynamic recrystallization during deformation at elevated temperature.

关键词： AZ31B镁合金弯曲加工单向弯曲微观结构拉伸性能板材室温力学性能平均晶粒尺寸

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Effects of yttrium addition on microstructure and mechanical properties of as-extruded AZ31 magnesium alloys

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中国有色金属学会会刊：英文版 2008年第A01期18卷 1-6页

作者：潘复生陈美宝王敬丰彭建汤爱涛 national engineering research Center for magnesium alloys Chongqing University School of Safety engineering Chongqing University of Science and Technology

The effects of yttrium addition on microstructure and mechanical properties of as-extruded AZ31 magnesium alloys were investigated by OM,XRD and *** results show that the addition of yttrium results in the formation of a new phase,Al_2Y. When the addition of yttrium is higher than 1.48%-2.91%(mass fraction),another new phase,Al_3Y_5Mn_7,forms,and the amount ofβ-Mg_(17)Al_(12) phase in the AZ31 alloy decreases *** tensile test at room temperature indicates that the yield strength of as-extruded AZ31 alloys improves with the addition of yttrium,but the elongation decreases,which is possibly related to the formation of coarse blocky compounds containing yttrium and the grain coarsening in the alloys.

关键词：镁合金稀有金属微观结构调查研究

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