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Cu/Li Ratio on the Microstructure Evolution and corrosion behaviors of Al–xCu–yLi–Mg Alloys

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Acta Metallurgica Sinica(English Letters) 2020年第9期33卷 1201-1216页

作者： Dan-Yang Liu Jin-Feng Li Yong-Cheng Lin Peng-Cheng Ma Yong-Lai Chen Xu-Hu Zhang Rui-Feng Zhang School of Materials Science and Engineering Central South UniversityChangsha 410083China School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education Central South UniversityChangsha 410083China Aerospace Research Institute of Materials and Processing Technology Beijing 100076China

The microstructure evolution and the corrosion feature of Al–x Cu– y Li–Mg alloys( x : y = 0.44, 1.65 and 4.2) were systematically investigated under the same artificial aging conditions. The relationships between types of precipitates and mechanical performance, as well as electrochemical behaviors, were discussed. Our results show that different types of precipitates can be obtained in alloys with different Cu/Li mass ratios, which significantly influences the mechanical performance of the alloys and substantial corrosion behaviors. Specifically, the analogous corrosion evolution in the aging Al– x Cu– y Li–Mg alloys was first ascertained to be derived from the growth mechanism of the precipitates at the grain boundary(GB). Moreover, a small number of GB precipitates can be obtained in the aged alloy with the lowest Cu/Li mass ratio, thereby resulting in the largest intergranular corrosion resistance. A higher proportion of the GB T1 phase in the continuous precipitates induces higher corrosion sensitivity in alloy with a high Cu/Li mass ratio.

关键词： Al–Cu–Li–Mg alloy Cu/Li mass ratio Microstructure evolution corrosion behaviors

Effects of trace Ca/Sn addition on corrosion behaviors of biodegradable Mg-4Zn-0.2Mn alloy

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Journal of Magnesium and Alloys 2018年第1期6卷 1-14页

作者： Wenbo Du Ke Liu Ke Ma Zhaohui Wang Shubo Li College of Materials Science and Engineering Beijing University of TechnologyBeijing 100124PR China

The effects of alloying elements of Ca/Sn on corrosion behaviors of the as-cast Mg-4Zn-0.2Mn alloy were investigated by immersion tests and electrochemical *** results indicated that the average corrosion rate value of the Mg-4Zn-0.2Mn-Ca alloy was∼0.31 mm/year in Hank’s physiological solution for 40 days,and corrosion resistance increased for the specimens containing Ca element rather than that containing Sn because of the higher breakdown potential value,lower current density and deactivated corrosion rate,which was ascribed to a formation of the uniformly distributed Mg-Zn-Ca ternary phase.

关键词： Mg-Zn-Mn alloy corrosion behaviors Hank’s physiological solution Electrochemical test

The corrosion behaviors of Mg-7Gd-5Y-1Nd-0.5Zr alloy under(NH4)_(2)SO_(4),NaCl and Ca(NO_(3))_(2)salts spray condition

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Journal of Magnesium and Alloys 2013年第3期1卷 230-234页

作者： Quantong Jiang Kui Zhang Xinggang Li Yongjun Li Minglong Ma Guoliang Shi Jiawei Yuan State Key Lab for Non-ferrous Metals and Process Beijing General Research Institute for Non-ferrous MetalsBeijing 100088China

The corrosion behaviors of Mg–7Gd–5Y–1Nd–0.5Zr alloys after T5 treatment under(NH4)_(2)SO_(4),NaCl and Ca(NO_(3))_(2)salt spray condition were investigated by weight loss rates,residual mechanical properties,scanning electron microscope(SEM),X-ray Diffraction(XRD)and potentiodynamic polarization *** corrosion degree of Mg–7Gd–5Y–1Nd–0.5Zr alloys in Ca(NO_(3))_(2)salt spray was very shallow by corrosion morphology and the corrosion route was extended along the surface in texture-like shape,while the alloy in NaCl and(NH4)_(2)SO_(4)salt spray were major local corrosion and there were serious corrosion pits on the *** weight loss rates in(NH4)_(2)SO_(4),NaCl and Ca(NO_(3))_(2)salt spray was respectively 0.4147,0.1618 and 0.0725 mg/(cm2 d−1).The results of residual mechanical properties indicated that the corrosion order in salts spray of Mg–7Gd–5Y–1Nd–0.5Zr alloys is NH4SO4>NaCl>Ca(NO_(3))_(2),which was consistent with the results of potentiodynamic polarization *** type of the salts will play a vital role in the initiation of the corrosion of EW75 alloy when they are used in the atmosphere *** salts with the smaller PH value after dissolution will have a stronger impact on the corrosion of EW75 magnesium alloys.

关键词： EW75 magnesium alloy corrosion behaviors Salt spray PH value

Mechanical properties and corrosion behaviors of Mg-4Zn-0.2Mn-0.2Ca alloy after long term in vitro degradation

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Transactions of Nonferrous Metals Society of China 2020年第2期30卷 363-372页

作者： Yuan-fen CHENG Wen-bo DU Ke LIU Jun-jian FU Zhao-hui WANG Shu-bo LI Jin-long FU College of Materials Science and Engineering Beijing University of TechnologyBeijing 100124China

An extruded Mg-4Zn-0.2Mn-0.2Ca alloy was developed as potential biodegradable bone-plate due to its excellent *** term in vitro immersion in Hank’s solution and bending test were used to evaluate the degradability and the mechanical integrity of the *** results revealed that the degradation rate of the bone-plate increased in the first 7 days and then decreased with the prolonged immersion time before it finally reached a steady stage(about 0.84 mm/a)after immersion for 90 *** bending strength after immersion for 60 days was 67.6 MPa,indicating that the bone-plate could support certain mechanical load after long term *** formation of corrosion pits after degradation stemmed from the separation of the continuously distributed second phases from Mg matrix under the action of micro-galvanic *** a result,the mechanical performance of Mg-4Zn-0.2Mn-0.2Ca alloy was aggravated owing to the corrosion holes on its surface.

关键词： magnesium alloys bending strength corrosion behaviors in vitro degradation bone-plate

A Novel High-Entropy Amorphous Thin Film with High Electrical Resistivity and Outstanding corrosion Resistance

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Acta Metallurgica Sinica(English Letters) 2021年第11期34卷 1537-1545页

作者： Chuang-Shi Feng Tian-Wei Lu Tian-Li Wang Man-Zhen Lin Junhua Hou Wenjun Lu Wei-Bing Liao College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China

This study explores a novel WNbMoTaV high-entropy thin film(HETF)in amorphous structure via pulsed laser deposition *** formation of amorphous structure of this high-entropy alloy is ascribed to the high cooling rate during the deposition *** HETF shows a smooth surface with a height fl uctuation of less than 13 *** film has a high electrical resistivity of~320.6μΩ·cm and a low corrosion current density of 0.088μA/cm *** corrosion resistance of the HETF at ambient temperature is superior to the conventional AISI 316 L stainless *** high electrical resistivity and excellent corrosion resistance of the HETF are mainly attributed to its chemical disorder,cocktail effect and homogeneous amorphous *** experimental phenomenon not only provides a basis for the preparation of amorphous alloy films with low glass forming ability by pulsed laser deposition system,also promotes the potential application of WNbMoTaV HETF in the microelectronic components as resistivity sensors.

关键词： High-entropy alloys Thin films Electrical resistivity Microstructures corrosion behaviors

corrosion of Zinc Ferrite Based Inert Anodes in AlF_3-NaF-Al_2O_3 Melts Under Conditions of Anodic Polarization

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Journal of Rare Earths 2006年第z2期24卷 352-354页

作者：于先进张丽鹏董云会赵增典 School of Chemical Engineering Shandong University of Technology School of Materials and Metallurgy Northeast UniversityShenyang 110006China

ZnFe2O4-based inert anodes were made to conduct the aluminum electrolysis tests. The corrosion behaviors of the inert anodes were examined and discussed. Experiment results prove that: (1) ZnFe2O4-based inert anodes are good corrosion resistant to AlF3-NaF-Al2O3 melts under the conditions of anodic polarization; (2) High anodic current density ( > 1.5 A·cm-2), high alumina concentration and low ratio of NaF/AlF3 in the molten salts will be the most important conditions for using inert anode.

关键词： ZnFe2O4-based materials inert anode anodic polarization corrosion behaviors

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Effect of trace Ni addition on microstructure,mechanical and corrosion properties of the extruded Mg-Gd-Y-Zr-Ni alloys for dissoluble fracturing tools

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Journal of Magnesium and Alloys 2021年第5期9卷 1649-1660页

作者： J.Wang T.Li H.X.Li Y.Z.Ma K.N.Zhao C.L.Yang J.S.Zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Department of Petroleum Equipment of RIPED PetroChinaBeijing 100083China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China

Magnesium alloys,a novel functional material for the fabrication of fracturing tools,are being paid more and more attentions recently due to their relatively high mechanical properties and fast dissolubility ability after *** this study,the novel extruded Mg-10Gd-3Y-0.3Zr-xNi alloys will be reported and their microstructure,mechanical and corrosion behaviors will be also *** results show that Ni contents influence phase precipitation *** adding 0.2 wt%Ni,a large amount of Zr_(7)Ni_(10)phases will be precipitated insidesα-Mg matrix,directly leading to degradation of strength and large corrosion *** further increasing Ni contents,the precipitation phases can be changed from Mg_(5)RE to 18R-LPSO structure,resulting in higher mechanical properties and faster corrosion ***,adding Ni element also change the texture orientation by influencing the precipitation behavior of the *** alloys invented in this paper have attained the highest compressive and tensile properties among all the reported dissoluble magnesium *** work is beneficial in understanding the role of Ni in the magnesium alloys and provides more materials alternatives for the fabrication of dissoluble fracturing tools.

关键词： Dissoluble magnesium alloys Microstructure Mechanical properties corrosion behaviors Fracturing tools