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Effects of RE and N on Properties of corrosion resistance and Oxidation resistance of Gray Cast Iron

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Journal of Rare Earths 1998年第3期16卷 30-33页

作者：曾奇翟启杰 Foundry Institute University of Science and Technology Beijing Beijing 100083 China

By means of ladle inoculating, the effects of RE and N on the properties of corrosion resistance and oxidation resistance of gray cast iron were studied. The results show that the properties of both corrosion resistance and oxidation resistance are improved by adding suitable amount of RE, while RE and N are added as a multi inoculant, the oxidation resistance of gray cast iron is remarkably increased.

关键词： Rare earths Nitrogen Gray cast iron corrosion resistance Oxidation resistance

Advances in Medical Magnesium Alloy Surface Modification for corrosion resistance Improvement

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稀有金属材料与工程 2024年第11期53卷 3084-3100页

作者： Zhao Chen Mu Weiyi Ji Shouchang Li Huan He Fei Jing Lei Xu Bowen Liang Lisi School of Metallurgical Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Northwest Institute for Nonferrous Metal Research Xi'an 710016China Northwest Nonferrous Metal Baoji Innovation Research Institute Baoji 721013China Shaanxi Key Laboratory of Biomedical Metal Materials Northwest Institute for Nonferrous Metal ResearchXi'an 710016China

Since the magnesium and magnesium alloys have good load transmission,exceptional biosafety,unique biodegradability,etc,they have significant application possibilities in the field of medical ***,excellent corrosion resistance is one of the paramount prerequisites for magnesium and magnesium alloys as medical ***,magnesium alloys exhibit poor corrosion resistance,leading to rapid degradation in physiological environments due to high corrosion *** premature degradation,before completing their intended service life,compromises their structural integrity,severely limiting their clinical *** modification treatment of magnesium alloy to improve corrosion resistance has become a research hotspot of medical magnesium *** study primarily focused on the research advancements in the corrosion resistance enhancement of medical magnesium *** developmental trajectory and characteristics of medical magnesium alloys were ***,surface modification techniques such as micro-arc oxidation and ion implantation,as well as microstructure and properties of magnesium alloy surfaces after surface modification were *** formation mechanisms of various coatings were discussed,and their structures and properties were *** impact of coatings on the degradation rate of magnesium alloys was elucidated,aiming to identify key issues and potential solutions in the implementation and application of surface modification for medical magnesium *** were also provided,presenting the research directions for surface modification of medical magnesium alloys.

关键词： magnesium alloys surface modification degradation ratio corrosion resistance

New FeNiCrMo(P, C, B) high-entropy bulk metallic glasses with unusual thermal stability and corrosion resistance

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Journal of Materials Science & Technology 2020年第8期36卷 32-39页

作者： Yanhui Li Siwen Wang Xuewei Wang Meiling Yin Wei Zhang Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian116024China

New Fe(20–35) Ni(20) Cr(20–30) Mo(5–15)(P(0.6) C(0.2) B(0.2))(20) bulk metallic glasses with excellent thermal stability,strength, and corrosion resistance have been developed through the high-entropy alloy design *** high-entropy bulk metallic glasses(HE-BMGs) possess larger supercooled liquid regions of ~69 K,higher crystallization onset temperatures of ~852 K, larger undercoolings of ~109 K, and more sluggish crystallization process upon heating than the conventional metallic glass benefited from the high mixing entropy effect. The HE-BMGs also exhibit ultrahigh strength of ~3.4 GPa, Vickers hardness of ~1107,and superior corrosion resistance in acids and Na Cl solutions by formation of highly stable Cr-and Moenriched passive films. The new metal-metalloid HE-BMG system and exceptional properties give the alloys good promise for both scientific and engineering applications.

关键词： High-entropy bulk metallic glasses Thermal stability Crystallization corrosion resistance FeNiCrMo(P,C,B)alloys

corrosion resistance and Antifouling Bioinspired Coating with Doped Polyaniline and TO@CA Self-Healing Nanocapsules

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Journal of Bionic Engineering 2023年第6期20卷 2826-2839页

作者： Hongli Tian Wenbo Du Yuchao Zhan Limei Tian Jie Zhao Jiyu Sun Key Laboratory of Bionic Engineering(Ministry of Education China)Jilin UniversityChangchun130022China National Key Laboratory for Remanufacturing Army Academy of Armored ForcesBeijing100000China

In this study,an integrative bioinspired coating system for antifouling and corrosion resistance was investigated,in which self-healing nanocapsules(tung oil calcium alginate,TO@CA),doped polyaniline and nano-titanium dioxide nanocomposites(SPAn–TiO_(2))and a biostructure metal surface were *** antifouling property of the bioinspired coating resulted from the synergistic antifouling effect of nano-TiO_(2)and acid-doped polyaniline in SPAn–TiO_(2).The protonated nitrogen with a positive charge in SPAn–TiO_(2)and the intrinsic bactericidal property of nano-TiO_(2)could damage negatively charged single-celled chlorella,endowing the composite coating with good antifouling performance(less algae attached on the surfaces after a 90-day antifouling test and a conductivity test).The composite bioinspired coating had excellent corrosion resistance,which was due to the good synergistic anticorrosion barrier effect of SPAn–TiO_(2)with TO@CA nanocapsules and the repairing ability of microcracks of TO@CA nanocapsules during the corrosion *** bioinspired coating with 2 wt%SPAn–TiO_(2)and 2 wt%TO@CA nanocapsules exhibited a better adhesion,corrosion resistance and antifouling performance than the other coatings did.

关键词： corrosion resistance Antifouling Self-healing Multifunctional bioinspired coating Doped polyaniline

Effect of cold working and sandblasting on the microhardness, tensile strength and corrosion resistance of AISI 316L stainless steel

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International Journal of Minerals,Metallurgy and Materials 2012年第12期19卷 1093-1099页

作者： Suyitno Budi Arifvianto Teguh Dwi Widodo Muslim Mahardika Punto Dewo Urip Agus Salim Center for Innovation of Medical Equipments and Devices (CIMEDs) Department of Mechanical and Industrial Engineering Faculty of Engineering Universitas Gadjah MadaJl. Grafika 2 Yogyakarta 55281 Indonesia

The aim of this work is to investigate the effect of cold working and sandblasting on the microhardness, tensile strength and corro-sion rate of AISI 316L stainless steel. The specimens were deformed from 17% to 47% and sandblasted for 20 min using SiC particles with a diameter of 500-700 μm and an air flow with 0.6-0.7 MPa pressure. The microhardness distribution and tensile test were conducted and a measurement on the corrosion current density was done to determine the corrosion rate of the specimens. The result shows that the cold working enhances the bulk microhardness, tensile and yield strength of the specimen by the degree of deformation applied in the treatment. The sandblasting treatment increases the microhardness only at the surface of the specimen without or with a low degree of deformation. In addition, the sandblasting enhances the surface roughness. The corrosion resistance is improved by cold working, especially for the highly deformed specimen. However the follow-up sandblasting treatment reduces the corrosion resistance. In conclusion, the cold working is prominent to be used for improving the mechanical properties and corrosion resistance of AISI 316L stainless steel. Meanwhile, the sandblasting subjected to the cold worked steel is only useful for surface texturing instead of improving the mechanical properties and corrosion resistance.

关键词： stainless steel cold working sandblasting microhardness tensile strength corrosion resistance

Formation of Fe-19 wt%Cr-9 wt%Ni Nanocrystalline Alloy with Excellent corrosion resistance: Phase Transition and Microstructure

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Acta Metallurgica Sinica(English Letters) 2021年第6期34卷 825-833页

作者： Chongfeng Sun Shengqi Xi Xiaofeng Dang Jianping Li Yongchun Guo Zhong Yang Yaping Bai School of Materials and Chemical Engineering Xi'an Technological UniversityXi'an 710021China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China

In this paper,microstructure characteristics and phase transitions of Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy are comprehensively studied during the mechanical alloying and hot pressing sintering *** resistance of the sintered Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy samples is further *** the mechanical alloying process,Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy powders mainly composed of metastable ferrite phase are obtained after mechanical alloying for 8,16 and 24 h,*** the subsequent hot pressing sintering process,the phase transitions(from ferrite to austenite)occur from 650 to 750°C for Fe-19 wt%Cr-9 wt%Ni alloy powders milled for 24 *** the sintering temperature is raised to 1050°C for 1 h,the ferrite phase has transformed into austenite phase completely,and the obtained grain size of sintered Fe-19 wt%Cr-9 wt%Ni alloy is around 40 *** test of the sintered Fe-19 wt%Cr-9 wt%Ni alloy has been operated in 0.5 mol L^(-1) H_(2)SO_(4) solution to show the corrosion resistance *** show that the sintered Fe-19 wt%Cr-9 wt%Ni alloy exhibits excellent corrosion resistance,which is proved by higher self-corrosion potential,lower self-corrosion current density and larger capacitive reactance,compared with that of commercial 304 stainless steel.

关键词： Mechanical alloying Hot pressing sintering Nanocrystalline alloy Phase transition corrosion resistance

Effect of samarium on microstructure and corrosion resistance of aged as-cast AZ92 magnesium alloy

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Journal of Rare Earths 2014年第7期32卷 663-671页

作者：吴道高颜世宏王志强张志琦苗睿瑛张小伟陈德宏 National Engineering Research Center for Rare Earth Materials of Grinm General Research Institute for Nonferrous MetalsGrirem Advanced Materials Co.Ltd.

The effects of samarium（Sm） on microstructure and corrosion resistance of AZ92 magnesium alloy were characterized and analyzed by scanning electronic microscopy, X-ray diffraction, mass loss test, electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy and potentio-dynamic polarization test. The results showed that the added Sm could promote continuous precipitation of β-Mg17Al12 phase in grains, and meanwhile restrain discontinuous precipitation of the same phase along the grain boundaries. Thus, the precipitations distributed more uniformly in the aged AZ92 magnesium alloys. When the content of Sm was 0.5 wt.%, the corrosion resistance of aged AZ92 alloy tended to be the best, which was due to the β-phase distributes more homogeneous reducing the galvanic corrosion. The corrosion product film had more integrality and compactness than AZ92 alloys without Sm. However, it resulted in worse corrosion resistance of AZ92 alloy because of the formation of mass cathodic Al2 Sm phase coming from excess Sm in AZ92 alloy.

关键词： AZ92 alloy samarium microstructure precipitation corrosion resistance rare earths

Microstructure and corrosion resistance of vanadium films deposited at different target-substrate distance by HPPMS

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Rare Metals 2014年第5期33卷 587-593页

作者： Chun-Wei Li Xiu-Bo Tian Tian-Wei Liu Jian-Wei Qin Chun-Zhi Gong State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology College of Engineering and Technology Northeast Forestry University State Key Laboratory of Surface Physics and Chemistry China Academy of Engineering Physics

High power pulsed magnetron sputtering（HPPMS）, a novel physical vapor deposition technology, was applied to prepare vanadium films on aluminum alloy substrate in this paper. The influence of target–substrate distance（Dt–s）（ranging from 8 to 20 cm） on phase structure, surface morphology, deposition rate, and corrosion resistance of vanadium films was investigated. The results show that the vanadium films are textured with a preferential orientation in the（111） direction except for that fabricated at 20 cm. With Dt–sincreasing, the intensity of（111） diffraction peak of the films decreases and there exists a proper distance leading to the minimum surface roughness of 0.65 nm. The deposition rate decreases with Dt–sincreasing. All the V-coated aluminum samples possess better corrosion resistance than the control sample. The sample fabricated at Dt–sof 12 cm demonstrates the best corrosion resistance with the corrosion potential increasing by 0.19 V and the corrosion current decreasing by an order of magnitude compared with that of the substrate. The samples gain further improvement in corrosion resistance after annealing, and if compared with that of annealed aluminum alloy, then the corrosion potential of the sample fabricated at 20 cm increases by 0.415 V and the corrosion current decreases by two orders of magnitude after annealed at 200 °C. If the annealing temperature further rises to 300 °C, then the corrosion resistance of samples increases less obviously than that of the control sample.

关键词： High power pulsed magnetron sputtering Vanadium films Target–substrate distance Microstructure corrosion resistance

corrosion resistance of Mg-Al-LDH steam coating on AZ80 Mg alloy:Effects of citric acid pretreatment and intermetallic compounds

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Journal of Magnesium and Alloys 2023年第8期11卷 2967-2979页

作者： Jin-Meng Wang Xiang Sun Liang Song M.Bobby Kannan Fen Zhang Lan-Yue Cui Yu-Hong Zou Shuo-Qi Li Rong-Chang Zeng corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China School of Engineering University of NewcastleCallaghanNew South Wales 2308Australia College of Science and Engineering James Cook UniversityTownsvilleQueensland 4811Australia College of Chemical and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

In this study,the effects of intermetallic compounds(Mg_(17)Al_(12)and Al_(8)Mn_(5))on the Mg-Al layered double hydroxide(LDH)formation mechanism and corrosion behavior of an in-situ LDH/Mg(OH)_(2)steam coatings on AZ80 Mg alloy were *** acid(CA)was used to activate the alloy surface during the pretreatment *** alloy was first pretreated with CA and then subjected to a hydrothermal process using ultrapure water to produce Mg-Al-LDH/Mg(OH)_(2)steam *** effect of different time of acid pretreatment on the activation of the intermetallic compounds was *** microstructure and elemental composition of the obtained coatings were analyzed using FE-SEM,EDS,XRD and *** corrosion resistance of the coated samples was evaluated using different techniques,i.e.,potentiodynamic polarization(PDP),electrochemical impedance spectrum(EIS)and hydrogen evolution *** results indicated that the CA pretreatment significantly influenced the activity of the alloy surface by exposing the intermetallic *** surface area fraction of Mg_(17)Al_(12)and Al_(8)Mn_(5)phases on the surface of the alloy was significantly higher after the CA pretreatment,and thus promoted the growth of the subsequent Mg-Al-LDH *** CA pretreatment for 30 s resulted in a denser and thicker LDH *** in the CA pretreatment time significantly led to the improvement in corrosion resistance of the coated AZ80 *** corrosion current density of the coated alloy was lower by three orders of magnitude as compared to the uncoated alloy.

关键词： Magnesium alloy Citric acid pretreatment Steam coating Layered double hydroxide Intermetallic compounds corrosion resistance