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Effect of Carboxymethyl Cellulose(CMC) Functionalization on Dispersion, Mechanical, and corrosion properties of CNT/Epoxy Nanocomposites

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Chinese Journal of Polymer Science 2023年第8期41卷 1277-1286,I0010页

作者： Da-Wei Zhang Leonard Chia Ying Huang Department of Civil Construction and Environmental EngineeringNorth Dakota State UniversityFargo 58108USA

Carbon nanotube(CNT)/epoxy nanocomposites have a great potential of possessing many advanced properties.However,the homogenization of CNT dispersion is still a great challenge in the research field of nanocomposites.This study applied a novel dispersion agent,carboxymethyl cellulose(CMC),to functionalize CNTs and improve CNT dispersion in epoxy.The effectiveness of the CMC functionalization was compared with mechanical mixing and a commonly used surfactant,sodium dodecylbenzene sulfonate(Na DDBS),regarding dispersion,mechanical and corrosion properties of CNT/epoxy nanocomposites with three different CNT concentrations(0.1%,0.3%and 0.5%).The experimental results of Raman spectroscopy,particle size analysis and transmission electron microscopy showed that CMC functionalized CNTs reduced CNT cluster sizes more efficiently than Na DDBS functionalized and mechanically mixed CNTs,indicating a better CNT dispersion.The peak particle size of CMC functionalized CNTs reduced as much as 54%(0.1%CNT concentration)and 16%(0.3%CNT concentration),compared to mechanical mixed and Na DDBS functionalized CNTs.Because of the better dispersion,it was found by compressive tests that CNT/epoxy nanocomposites with CMC functionalization resulted in 189%and 66%higher compressive strength,224%and 50%higher modulus of elasticity than those with mechanical mixing and Na DDBS functionalization respectively(0.1%CNT cencentration).In addition,electrochemical corrosion tests also showed that CNT/epoxy nanocomposites with CMC functionalization achieved lowest corrosion rate(0.214 mpy),the highest corrosion resistance(201.031Ω·cm^(2)),and the lowest porosity density(0.011%).

关键词： CNT/epoxy composites Carboxymethyl cellulose Dispersion Mechanical properties corrosion properties

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In vitro corrosion properties of HTHEed Mg-Zn-Y-Nd alloy microtubes for stent applications:Influence of second phase particles and crystal orientation

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Journal of Magnesium and Alloys 2022年第5期10卷 1286-1295页

作者： Peihua Du Di Mei Tsuyoshi Furushima Shijie Zhu Liguo Wang Yifan Zhou Shaokang Guan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Advanced magnesium Alloys Zhengzhou 450002China Key Laboratory of Advanced Materials Processing and Mold Ministry of Education Zhengzhou 450002China Department of Mechanical and Biofunctional Systems Institute of Industrial ScienceThe University of Tokyo4-6-1KomabaMeguroTokyo 153-8505Japan Magnesium Innovation Centre-MagIC Institute of Materials ResearchHelmholtz-Zentrum GeesthachtGeesthacht 21502Germany

Magnesium(Mg)alloys are promising materials for cardiovascular stent applications due to their good biocompatibility and biodegradability.However,in vitro and in vivo corrosion tests reveal that Mg alloy stents suffer from a rapid corrosion rate and severe localized corrosion,which is limiting their widespread application.To solve the problem of uneven degradation of stents,a HTHE(long-time and high-temperature heat treatment,large-reduction-ratio hot extrusion)process is used to manufacture Mg-Zn-Y-Nd alloy microtubes in this study.The heat treatment is to dissolve alloying elements and reduce the size of SPPs,and the hot extrusion is to acquire fine-grained and strongly textured microtubes.The microstructural characterization shows that coarse second phases in as-cast alloy are refined and uniformly distributed in matrix of microtubes.After hot extrusion,microtubes show strong texture with basal plain oriented parallel to the longitudinal section(LS).The corrosion testing indicates that severe localized corrosion occurs on the cross section(CS)while localized corrosion is alleviated on the LS.Based on the different corrosion properties of the LS and CS,HTHEed microtubes are promising for solving the problems of rapid corrosion rate and severe localized corrosion of Mg alloy stents.

关键词： Mg-Zn-Y-Nd alloy Microtubes Heat treatment Hot extrusion corrosion properties Cardiovascular stent

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Effect of Solution Treatment on Microstructure and corrosion properties of Mg–4Gd–1Y–1Zn–0.5Ca–1Zr Alloy

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Acta Metallurgica Sinica(English Letters) 2018年第8期31卷 865-872页

作者： Jian-Wei Dai Xiao-Bo Zhang Yang Fei Zhang-Zhong Wang Huai-Ming Sui School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167China Yangzhou Fengming Optronic New Material Co. LtdYangzhou 225117China

The as-cast multi-element Mg–4Gd–1Y–1Zn–0.5Ca–1Zr alloy with low rare earth additions was prepared, and the solution treatment was applied at different temperatures. The microstructural evolution of the alloy was characterized by optical microscopy and scanning electron microscopy, and corrosion properties of the alloy in 3.5% NaCl solution were evaluated by immersion and electrochemical tests. The results indicate that the as-cast alloy is composed of the a-Mg matrix,lamellar long-period stacking-ordered（LPSO） structure and eutectic phase. The LPSO structure exists with more volume fraction in the alloy solution-treated at 440 °C, but disappears with the increase in the solution temperature. For all the solution-treated alloys, the precipitated phases are detected. The corrosion rates of the alloys decrease first and then increase slightly with the increase in the solution temperature, and the corrosion resistance of the solution-treated alloys is more than four times as good as that of the as-cast alloy. In addition, the alloy solution-treated at 480 °C for 6 h shows the best corrosion property.

关键词： Magnesium alloy Solution treatment Microstructure corrosion properties

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Addition Al and/or Ti Induced Modifi cations of Microstructures, Mechanical properties, and corrosion properties in CoCrFeNi High-Entropy Alloy Coatings

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Acta Metallurgica Sinica(English Letters) 2021年第8期34卷 1087-1102页

作者： Guoliang Ma Yong Zhao Hongzhi Cui Xiaojie Song Mingliang Wang Kwangmin Lee Xiaohua Gao Qiang Song Canming Wang School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Solidifi cation Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China School of Materials Science and Engineering Chonnam National UniversityGwangju 61186Korea

The purpose of this work is to study the influences of Al and/or Ti addition on the microstructures, mechanical properties and corrosion properties of CoCrFeNi-(Al, Ti) high entropy alloy(HEA) coatings. Three coatings, AlCoCrFeNi(Ⅰ), CoCrFeNiTi_(0.5)(Ⅱ) and AlCoCrFeNiTi_(0.5)(Ⅲ), were fabricated by laser cladding successfully. The AlCoCrFeNi(Ⅰ) coating exhibited a simple body-centered cubic(BCC) solid-solution structure, whereas the CoCrFeNiTi_(0.5)(Ⅱ) alloy exhibited a face-centered cubic(FCC) solid-solution and a small amount of Laves phase. The BCC phases in AlCoCrFeNiTi _(0.5)(Ⅲ) coating were characterized as Fe–Cr rich disordered BCC phases(A2) and Al-Ni–Ti-rich ordered BCC phases(L2_1) separately. The AlCoCrFeNiTi_(0.5)(Ⅲ) coating with dual-phase BCC structure showed the optimal performance of both mechanical and corrosion properties, which was superior to BCC-based AlCoCrFeNi(Ⅰ) and FCC-based CoCrFeNiTi_(0.5)(Ⅱ) coatings. Nanoindentation tests and quantitative investigations on the strengthening mechanisms of AlCoCrFeNiTi_(0.5)(Ⅲ) coating were conducted, suggesting that the precipitation strengthening is the dominant strengthening mechanism. In short, the addition of moderate amount of Al and Ti in CoCrFeNi HEA shows potential for the development of a high strength and corrosion-resistant coating.

关键词： High entropy alloy Laser cladding corrosion properties Mechanical properties

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Effects of Zn content on the microstructure and the mechanical and corrosion properties of as-cast low-alloyed Mg–Zn–Ca alloys

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International Journal of Minerals,Metallurgy and Materials 2018年第7期25卷 800-809页

作者： hong-xiang li shi-kai qin ying-zhong ma jian wang yun-jin liu ji-shan zhang state key laboratory for advanced metals and materials university of science and technology beijingbeijing 100083China

The effects of Zn content on the microstxucture and the mechanical and corrosion properties of as-cast low-alloyed Mg-xZn~.2Ca alloys （x = 0.6wt%, 2.0wt%, 2.5wt%, hereafter denoted as 0.6Zn, 2.0Zn, and 2.5Zn alloys, respectively） axe investigated. The results show that the Zn content not only influences grain refinement but also induces different phase precipitation behaviors. The as-cast microstxucture of the 0.6Zn alloy is composed of ct-Mg, Mg2Ca, and Ca2Mg6Zn3 phases, whereas 2.0Zn and 2.5Zn alloys only contain ct-Mg and Ca2Mg6Zn3 phases, as revealed by X-ray diffraction （XRD） and txonsmission electron microscopy （TEM） analyses. Moreover, with in- creasing Zn content, both the ultimate tensile strength （UTS） and the elongation to fracture first increase and then decrease. Among the three investigated alloys, the largest UTS （178 MPa） and the highest elongation to fracture （6.5%） are obtained for the 2.0Zn alloy. In addition, the corrosion rate increases with increasing Zn content. This paper provides on updated investigation of the alloy composi- tion-microstxucture-property relationships of different Zn-containing Mg-Zn-Ca alloys.

关键词： Mg-Zn-Ca alloy s as-cast micro stxucture mechanical properties corrosion properties

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Microstructure evolution and corrosion properties of Mg-Dy-Zn alloy during cooling after solution treatment

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Journal of Rare Earths 2016年第9期34卷 931-937页

作者：毕广利姜静张帆房大庆李元东马颖郝远 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Key Laboratory of Nonferrous Metal Alloys and Processing Ministry of EducationLanzhou University of Technology College of Materials Science and Engineering Taiyuan University of Science and Technology

Microstructure evolution and corrosion properties of Mg-2Dy-0.5Zn （at.%） alloy during cooling after solution treatment were investigated. The microstructure of alloy in the solid solution state （530 oC, 12 h） was composed ofα-Mg and small amounts of （Mg, Zn）xDy phases. During cooling at a cooling rate of 2 oC/min, the 14H-type LPSO phase gradually precipitated in the grain inte-rior and its volume fraction increased with increasing cooling time. The alloy cooled for 20 min exhibited the highest hardness value. In addition, electrochemical and immersion test results indicated that the alloy cooled for 5 min exhibited small corrosion current and low corrosion rate. The good corrosion resistance of alloy was mainly attributed to the continuous distribution of LPSO phase along the grain boundary.

关键词： Mg-Dy-Zn alloy LPSO phase cooling microstructure evolution corrosion properties rare earths

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The effect of sodium silicate concentration on microstructure and corrosion properties of MAO-coated magnesium alloy AZ31 in simulated body fluid

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Journal of Magnesium and Alloys 2014年第1期2卷 72-77页

作者： B.Salami A.Afshar A.Mazaheri Department of Materials and Engineering Sharif University of TechnologyP.O.Box 11155-9466TehranIran

In recent years,magnesium and its alloys are considered as biodegradable implants.However magnesium implants may rapidly corrode before the natural healing process of the tissue is completed.In this investigation,micro arc oxidation process has been studied for avoiding primary corrosion of the magnesium alloy in simulated body fluid.Anodized coating was formed on AZ31 alloy in nontoxic silicate-alkaline solution at constant current.The effects of silicate concentration and conductivity of electrolyte solution on microstructure and corrosion properties of coating were evaluated.Scanning electron microscopy showed that a thick and condensed coating is formed after enough anodizing period.Energy dispersive spectroscopy showed that Si,O and Mg are the main components of the coating.corrosion resistance of the coated and uncoated samples was assessed using potentiodynamic polarization and electrochemical impedance spectroscopy tests in SBF at 37℃ and pH of 7.4.Maximum corrosion resistance was achieved at 30 g/L concentration of sodium silicate in anodizing solution.It was observed that further increase in silicate concentration decreased the corrosion resistance.

关键词： Magnesium alloy Micro arc oxidation Sodium silicate Conductivity corrosion properties

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Effect of Mn and MnS on corrosion properties of domestic pipeline steels and welds

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China Welding 2004年第2期13卷 123-127页

作者：李云涛杜则裕陶勇寅李建军 School of Materials Science and Engineering Tianjin University Tianjin 300072 Hebei Institute of Petroleum and Technology Langfang 065000

Base metals of domestic pipeline steels were used to study the effect of Mn on corrosion properties of SSCC(Sulfide Stress corrosion Cracking), and welds were carried out to study the effect of MnS on corrosion properties of HIC (Hydrogen Induced Cracking) both in solutions with wet hydrogen sulfide(H_2S). They were respectively conducted by referring to the standards of SSCC and HIC. Testing results revealed that with the increase of content Mn, the resistance of SSCC will be decreased, from the point of metallurgic view, and it is Mn element not C element to lead to the testing results of SSCC. Meanwhile, even under the condition without inclusions MnS, HIC in welds still occurred. That is to say, MnS is not necessary for HIC, the presence of local banded structures in which Mn and P are inclined to aggregate cause to the phenomena of HIC.

关键词： domestic pipeline steels welds Mn MnS corrosion properties

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corrosion behavior of a Mg-Zn-Ca-La alloy in 3.5 wt%NaCl solution

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Journal of Magnesium and Alloys 2022年第2期10卷 567-580页

作者： Yuzhou Du Xin Wang Dongjie Liu Wanting Sun Bailing Jiang School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China Shaanxi Province Engineering Research Center for Magnesium Alloys Xi’an University of TechnologyXi’an 710048China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China

The present study investigates the corrosion behavior of a Mg–Zn–Ca–La alloy.Results indicate that the corrosion resistance is enhanced by rolling deformation and subsequent annealing treatment significantly.The microstructure,distribution of second phase and grain orientation are the main factors affecting corrosion properties.The second phase with semi-continuous network in the as-cast alloy gives rise to the penetration of corrosion into the matrix.However,the dispersed second phase after deformation results in uniform corrosion.The formation of dense corrosion layer at the initial stage of corrosion is favorable for the improvement of corrosion resistance.The sample withplane oriented towards surface exhibits good corrosion resistance,which is ascribed to the homogeneous microstructure and strong basal texture.

关键词： Mg–Zn–Ca–La Rolling Second phase Texture corrosion properties

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Impressive strides in amelioration of corrosion and wear behaviors of Mg alloys using applied polymer coatings on PEO porous coatings:A review

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Journal of Magnesium and Alloys 2022年第5期10卷 1171-1190页

作者： Arash Fattah-alhosseini Razieh Chaharmahali Kazem Babaei Department of Materials Engineering Bu-Ali Sina UniversityHamedan 65178-38695Iran

Magnesium(Mg)and its alloys have received much attention in a lot of areas due to their special chemical and physical properties.Nevertheless,high corrosion rates are a limiting factor.The plasma electrolytic oxidation(PEO)technique is a simple approach to place an oxide film on the surface of light metals like Mg alloys.This method has been considered for controlling the rate of corrosion and improving some other properties.On the other hand,PEO coatings cannot make enough protection of Magnesium alloys for a long time due to porosity and fine cracks.Therefore,PEO-based composite coatings are used to make adequate corrosion protection on the Mg alloys surface.The popularity of these coatings is due to their good corrosion resistance,simplicity,high coating capability,and cost-effectiveness in complex segments.Formation of an organic layer on the surface of PEO coating is one of the effective methods to close the defects and thus prevent the corrosive species penetration into the substrate.Coating the PEO coating with a polymer layer can be a good solution to control the amount of damage and improve the corrosion and abrasion resistance.In addition,PEO coating can eliminate the problems of insufficient adhesion of polymer coatings and is considered as a suitable base for composite coatings.This review paper presents the corrosion and abrasion behavior of the PEO/Polymer dual coating system on Mg alloys.Given the fundamental role of coatings thickness and morphology in wear and corrosion behavior,these aspects have been highly discussed in this study.

关键词： Composite coating Mg alloys PEO Polymer corrosion properties Wear resistance

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