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Influence of LDH conversion coatings on the adhesion and corrosion protection of friction spot-joined AA2024-T3/CF-PPS

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Journal of materials Science & Technology 2021年第8期67卷 197-210页

作者： A.C.Bouali N.m.Andre m.R.Silva Campos m.serdechnova J.F.dos Santos S.T.Amancio-Filho m.L.Zheludkevich Institute of materials Research Helmholtz-Zentrum G eesthacht.Magnesium Innovation CentreCorrosion and Surface TechnologyMax-Planck-Straβe 121502 CeesthachtGermany Institute of materials Research Helmholtz-Zentrum GeesthachtMaterials MechanicsSolid State Joining ProcessesMax-Planck-Straβe 121502 CeesthachtGermany Graz University of Technology-TU Graz Institute of Materials Sciencejoining and FormingBMK Endowed Professorship for AviationKopemikusgasse 24/18010 GrazAustria Faculty of Engineering University of KielKaiserstrasse 224143 KielGermany

Layered double hydroxide(LDH)conversion coatings loaded with corrosion inhibitors were suggested for the surface treatment of the aluminum alloy 2024-T3,prior to friction spot joining with carbon-fiber reinforced polyphenylene sulfide(AA2024-T3/CF-PPS).Vanadate was used as a model corrosion *** shear testing method revealed an increase of approx.20%of the joint’s adhesion performance when treated with LDH and before exposure to salt *** evaluation of the joints after exposure to salt spray demonstrated a significant difference in the corrosion behavior of the joints when the AA2024-T3 is treated with LDH loaded with nitrate and vanadate *** LDH intercalated with nitrate revealed a clear improvement in the mechanical and corrosion resistance performance of the joints,even after 6 weeks of salt ***,the LDH intercalated with vanadate failed in providing protection against corrosion as well as preserving the mechanical properties of the *** effect of the galvanic corrosion was further investigated by zero resistance ammeter(ZRA)measurements as well as localized scanning vibrating electrode technique(SVET).

关键词： Friction spot joining Layered double hydroxide Galvanic couple Corrosion protection Adhesion

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Plasma electrolytic oxidation of AZ31 and AZ91 magnesium alloys:Comparison of coatings formation mechanism

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Journal of magnesium and Alloys 2020年第3期8卷 587-600页

作者： A.G.Rakoch E.P.monakhova Z.V.Khabibullina m.serdechnova C.Blawert m.L.Zheludkevich A.A.Gladkova aDepartment of metal Protection and Surface Treatment National University of Science and Technology‘MISiS’Leninskiy prospekt 4119049 MoscowRussia Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research GmbHMax-Plank Str.l21502 GeesthachtGermany Faculty of Engineering Kiel UniversityKaiserstrasse 224143 KielGermany

The growth kinetics of PEO coatings on AZ31 and AZ91 magnesium alloys were studied and correlated with their structure,compositions(phase and elemental)and corrosion *** was established that the coatings have a two-(outer and anodic)or three-layer structure(outer,inner and anodic)depending on the treatment ***,at short treatment time only an anodic layer and outer layer *** of the outer PEO layer takes place due to the micro discharges,which occur in vertical pores and voids with spherical *** the time is increasing,and electrolyte inside of the pores is heating-up,etching of the mg substrate and oxide film becomes more dominant and horizontal pores in the interface between coating and metal are *** the pores new anodic layer will form and at this time the formation of the third inner layer *** growth of the inner layer happens via the anodic film as a result of micro discharge ignition in the horizontal pores,accompanied by formation of plasma in numerous micro-voids of this *** coatings formed on AZ91 alloy are denser,than those on AZ31,which is related to the difference in the rates of inner layer growth and dissolving of oxides which are located at the bottom of the horizontal *** of the lower Al content,the AZ31 substrate itself and the also the oxide films are less stable and tend to dissolve at a higher rate compared to ***,it was demonstrated that a good corrosion resistance of the coatings was only obtained on AZ91 and if the average thickness of the coating is around 50μm,correlating with the formation of a sufficiently dense inner laye-Knowing this mechanism,a new two-step treatment was suggested,combining the standard PEO treatment with a subsequent PEO process in an electrolyte supporting the inner film *** concept was successfully applied and a further improved corrosion resistance was obtained compared to the single stage PEO *** improvement of corrosion re

关键词： Plasma electrolytic oxidation magnesium alloys Coating formation Coating growth Corrosion resistance.

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mg-Ti hybrid joints:Surface modification,corrosion studies and 3D-pore investigation using synchrotron-based microtomography

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Journal of magnesium and Alloys 2024年第8期12卷 3142-3158页

作者： m.Fazel V.m.Garamus m.serdechnova Fabian Wilde F.Wieland E.Nidadavolu T.Wu T.Ebel C.Blawert R.Willumeit-Römer m.L.Zheludkevich Institute of metallic Biomaterials Helmholtz-Zentrum HereonGeesthacht 21502Germany Institute of Surface Science Helmholtz-Zentrum HereonGeesthacht 21502Germany Institute of materials Physics Helmholtz-Zentrum HereonGeesthacht 21502Germany Faculty of Engineering Institute of Materials ScienceKiel UniversityKaiserstraße 2Kiel 24143Germany

A new direction toward the future of orthopedic implants is to combine biodegradable mg alloys with permanent Ti to produce selectively biodegradable hybrid joints for advanced tissue ***,the strong galvanic corrosion between mg and Ti is a major issue to be *** work aims to explore plasma electrolytic oxidation(PEO)as a single-step coating treatment to allow for an acceptable degradation behavior of mgTi hybrid *** this end,mgTi hybrid joints were produced through the heat treatment of mg-0.6Ca and commercially pure Ti specimens at 640°C for 8 h.A single-step PEO treatment was then employed to create a protective layer on the surface of hybrid *** though the scanning electron microscopy(SEm)images showed only a porosity of 6%and 12%within the PEO layers on single mg and mgTi couples,3D investigation of the synchrotron-based microtomography data demonstrated a porosity of 18%and 30%with a considerable number of interconnected *** to the electrochemical impedance spectroscopy measurements,the impedance modulus at all frequencies on coated mgTi coupled specimens was lower than that on the coated single mg-0.6Ca and pure ***,the application of PEO treatment significantly decreased the strong galvanic degradation of mg-0.6Ca in contact with *** results of hydrogen evolution tests revealed that PEO-treated mgTi couples showed a similar degradation behavior as the single alloy during the first day of immersion.

关键词： mg-Ti hybrid implants Plasma electrolytic oxidation Synchrotron microtomography Galvanic corrosion

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In situ formation of LDH-based nanocontainers on the surface of AZ91 magnesium alloy and detailed investigation of their crystal structure

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Journal of magnesium and Alloys 2022年第5期10卷 1268-1285页

作者： Tatsiana Shulha m.serdechnova m.H.Iuzviuk I.A.Zobkalo P.Karlova N.Scharnagl D.C.F.Wieland S.V.Lamaka A.A.Yaremchenko C.Blawert m.L.Zheludkevich Helmholtz-Zentrum Hereon Institute of Surface ScienceMax-Planck-Straβe 1Geesthacht 21502Germany Condensed matter Department Petersburg Nuclear Physics Institute Named by B.P.Konstantinov of National Research Center“Kurchatov Institute”MKR Orlova roshcha 1Gatchina 188300Russian Federation Helmholtz-Zentrum Hereon Institute of Metallic BiomaterialsMax-Planck Straβe 1Geesthacht 21502Germany Department of materials and Ceramic Engineering CICECO–Aveiro Institute of MaterialsUniversity of AveiroAveiro 3810-193Portugal Faculty of Engineering University of KielKaiserstraβe 2Kiel 24143Germany

In the presented work, the possibility of direct synthesis of LDH(layered double hydroxide) on the AZ91 surface in the presence of a chelating agent(diethylenetriaminepentaacetic acid-DTPA) is reported. Conversion layer of LDH nanocontainers were formed under ambient pressure conditions without carbonate addition in the electrolyte. The obtained LDH was characterized using experimental(SEm,XRD, TGA, XPS, Raman, etc.) and computational methods(thermodynamic calculation, modeling of possible LDH crystal structures). A comparison of three possible LDHs(LDH-OH,-NO_(3) and-CO_(3)) was performed. Based on the experimental results and crystal simulation approach, it was confirmed, that the mixed LDH-OH/CO_(3) is grown on the surface in the presence of DTPA pentasodium salt.

关键词： Layered double hydroxides magnesium alloy Chelating agent Functional coating

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Difference in formation of plasma electrolytic oxidation coatings on mgLi alloy in comparison with pure mg

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Journal of magnesium and Alloys 2021年第5期9卷 1745-1760页

作者： Ting Wu Carsten Blawert Xiaopeng Lu maria serdechnova mikhail L.Zheludkevich Institute of Surface Science Helmholtz-Zentrum Hereon21502 GeesthachtGermany Shenyang National Laboratory for materials Science Northeastern University110819 ShenyangChina Institute for materials Science Faculty of EngineeringKiel UniversityKaiserstrasse 224143 KielGermany

In order to study the substrate lattice structure(Li addition)on the growth of plasma electrolytic oxidation(PEO)coatings,mg Li alloy(11.36 wt.%of Li,cubic)and pure mg(hexagonal)were treated under a pulsed direct PEO mode in a phosphate electrolyte for different periods of *** results revealed that the presence of Li and Li-rich phases in the cubic mg alloy seems to be essential for the treatment result rather than the original lattice structure.A modified discharge behavior of mg Li alloy finally led to a different microstructure of the *** unstable coatings of mg Li alloy tended to dissolve rapidly though shared the similar composition to that of pure *** was incorporated only in the primary conversion products at the interface of coating/mg *** spite of the advanced efficiency of energy input during processing,the more porous and thinner PEO coatings on the mg Li alloy were less resistant to abrasion and corrosion.

关键词： Plasma electrolytic oxidation magnesium lithium alloy Pure magnesium microstructure

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Incorporation of LDH nanocontainers into plasma electrolytic oxidation coatings on mg alloy

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Journal of magnesium and Alloys 2023年第4期11卷 1236-1246页

作者： Yan Li Xiaopeng Lu maria serdechnova Carsten Blawert mikhail L.Zheludkevich Kun Qian Tao Zhang Fuhui Wang Shenyang National Laboratory for materials Science Northeastern University3-11 Wenhua RoadShenyang 110819China Institute of Surface Science Helmholtz-Zentrum HereonGeesthacht 21502Germany Institute of materials Research Faculty of EngineeringUniversity of KielKaiserstraβe 2Kiel 24143Germany School of materials Science and Engineering Southeastern UniversityNanjing 211189China

In-situ incorporation of layered double hydroxides(LDH)nanocontainers into plasma electrolytic oxidation(PEO)coatings on AZ91 mg alloy has been achieved in the present *** was selected as mg corrosion inhibitor for exchange and intercalation into the nanocontainers,which were subsequently incorporated into the *** was found that the thickness and compactness of the coatings were increased in the presence of LDH *** corrosion protection performance of the blank PEO,LDH containing PEO and inhibitor loaded coatings was evaluated by means of polarization test and electrochemical impedance spectroscopy(EIS).The degradation process and corrosion resistance of PEO coating were found to be greatly affected by the loaded inhibitor and nanocontainers by means of ion-exchange when corrosion occurs,leading to enhanced and stable corrosion resistance of the substrate.

关键词： magnesium Layered double hydroxides Inhibitor Plasma electrolytic oxidation Nanocontainer

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In-situ LDHs growth on PEO coatings on AZ31 magnesium alloy for active protection:Roles of PEO composition and conversion solution

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Journal of magnesium and Alloys 2023年第7期11卷 2376-2391页

作者： Gen Zhang Liang Wu maria serdechnova Aitao Tang Cheng Wang Carsten Blawert Fusheng Pan mikhail L.Zheludkevich Nuclear Power Institute of China ChengduSichuan 610213China College of materials Science and Engineering Chongqing UniversityChongqing 400044China Institute of Surface Science Helmholtz-Zentrum HereonMax-Planck Str.1Geesthacht 21502Germany National Engineering Research Center for magnesium Alloys Chongqing UniversityChongqing 400044China Institute for materials Science Faculty of EngineeringUniversity of KielKaiserstraße 2Kiel 24143Germany

In this work,plasma electrolytic oxidation(PEO)coatings were produced on magnesium alloy AZ31 in aluminate,silicate and phosphate-based electrolytes,and followed by hydrothermal treatments in order to synthesis layered double hydroxides(LDHs)based *** synthesis was done in three different growth solutions(deionized water,sodium nitrate and aluminum nitrate containing solution).In frame of this work it was shown,that it was difficult to form LDHs on Si-based PEO coating,due to more stable silicate phases in comparison with aluminate and phosphate phases in respective PEO *** obtained hybrid LDH/PEO coatings were characterized using SEm,EDS and GDOES,and then the corrosion protection was further investigated by *** on the obtained results,it was confirmed that,the hydrothermal treatments in Al^(3+)containing solution played an important role on overall corrosion resistance for phosphate and silicate-based PEO coatings,but not for Al-based PEO coatings.

关键词： Layered double hydroxides Plasma electrolytic oxidation Corrosion resistance magnesium alloys

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micro-arc oxidation of magnesium alloys:A review

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Journal of materials Science & Technology 2022年第23期118卷 167-189页

作者： Wenhui Yao Liang Wu Jingfeng Wang Bin Jiang Dingfei Zhang maria serdechnova Tatsiana Shulha Carsten Blawert mikhail L.Zheludkevich Fusheng Pan College of materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for magnesium Alloys Chongqing UniversityChongqing 400044China Institute of Surface Science Helmholtz-Zentrum HereonMax-Planck Str.1Geesthacht 21502Germany Institute of materials Science Faculty of EngineeringCAU Kiel UniversityKaiser Str.2Kiel 24143Germany

magnesium(mg)and its alloys present great potential to be extensively applied in different ***,the relatively poor resistance to corrosion and wear significantly restricts their applications in *** one of strategies of surface treatment,micro-arc oxidation(mAO)process attracts a lot of attention,since it does not use neither expensive equipment,nor complicated *** review systematically discusses mAO mechanism and some typical models,which still need to be further developed to provide a better understanding and guide for future ***,main influencing factors of mAO process are analyzed in ***,some popular applications of mAO coatings are respectively reviewed,including biomedical application,decoration,thermal control,corrosion and wear resistance,and industrial applications in *** existing issues and future perspectives are finally discussed to further accelerate extensive applications of mg alloys.

关键词： micro-arc oxidation magnesium alloys Review main mAO applications Existing issues and future perspective

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“Smart”micro/nano container-based self-healing coatings on magnesium alloys:A review

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Journal of magnesium and Alloys 2023年第7期11卷 2230-2259页

作者： Yonghua Chen Liang Wu Wenhui Yao Jiahao Wu maria serdechnova Carsten Blawert mikhail L.Zheludkevich Yuan Yuan Zhihui Xie Fusheng Pan National Engineering Research Center for magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044China State Key Laboratory of mechanical Transmission Chongqing UniversityChongqing 400044China Institute of Surface Science Helmholtz-Zentrum HereonMax-Planck Str.121502 GeesthachtGermany Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China

Coating technologies are a commonly used way to protect metals against ***,with more and more severe service environments of materials,many protective coating systems often are not environmentally friendly or toxic as in the case of *** on the world’s abundant ideal magnesium(mg)and its alloy,the smart self-healing anticorrosive coating can autonomously restore the damaged part of the coating according to the environmental changes,strengthen the corrosion protection ability,and prolong its service *** paper reviews the research progress of smart self-healing coatings on mg *** coatings mostly contain suitable corrosion inhibitors encapsulated into micro/nano ***,the different self-healing mechanisms and functionalities of micro/nano containers are *** micro/nano containers range from inorganic nanocontainers such as mesoporous nanoparticles(silica(SiO_(2)),titanium dioxide(TiO_(2)),etc.),over inorganic clays(halloysite,hydrotalcite-like,zeolite),to organic nanocontainers such as polymer microcapsules,nanofibers,chitosan(CS)and cyclodextrin(CD),as well as,carbon materials such as graphene and carbon nanotubes and hybrids such as metal organic *** functioning of micro/nano containers can be divided in two principal groups:autonomous(based on defect filling and corrosion inhibition)and non-autonomous(based on dynamic bonds and shape memory polymers).moreover,multi functionalities and composite applications of various micro/nano containers are *** present,significant progress has been made in the preparation methods and technologies of micro/nano *** long-term self-healing properties of coatings sensing of coating failure and early warning after self-healing function failure can be expected as the main development direction of self-healing corrosion protection coatings in the future.

关键词： magnesium alloy Self-healing coating micro/nano containers mechanism Corrosion protection

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Improvement of corrosion resistance of PEO coated dissimilar Ti/mg0.6Ca couple

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Journal of magnesium and Alloys 2024年第7期12卷 2741-2755页

作者： Ting Wu mohammad Fazel maria serdechnova Vasil m.Garamus D.C.Florian Wieland Fabian Wilde Julian moosmann Thomas Ebel Regine Willumeit-Römer Carsten B.lawert mikhail L.Zheludkevich Institute of Surface Science Helmholtz Zentrum HereonMax-Planck Str.121502 GeesthachtGermany Institute of metallic Biomaterials Helmholtz Zentrum HereonMax-Planck Str.121502 GeesthachtGermany Institute of materials Physics Helmholtz Zentrum HereonMax-Planck Str.121502 GeesthachtGermany Institute for materials Science Faculty of EngineeringChristian-Albrechts-Universität zu KielKaiserstrasse 224143 KielGermany

With the growing demand for weight reduction,the application of joint lightweight structural materials is *** alloys feature low density,high specific strength and good formability,offering significant advantages for fuel efficiency and load *** with Ti,a dissimilar Ti/mg composite material provides great flexibility combining the properties of each ***,because of the great differences in chemical and electrochemical properties between mg and Ti,it is imperative to address the galvanic corrosion problem of such dissimilar Ti/mg *** work presents an investigation of the PEO processing of sintered Ti/mg0.6Ca couples,aiming to improve the corrosion resistance of such dissimilar alloy combinations using a phosphate-aluminate *** results show that uniform and continuous coatings can be formed on the dissimilar Ti/mg0.6Ca *** coating mainly contains mgO and mgAl_(2)O_(4)on the mg0.6Ca side,and Al_(2)TiO_(5)is the dominant phase on the Ti *** work also took advantage of synchrotron X-ray computed tomography(CT)scanning to achieve 3D reconstruction of the coating morphology,which can be a fast method to assess the porosity and compactness of the coating and further predict the coating corrosion *** coating effectively improved the corrosion resistance of the dissimilar Ti/mg0.6Ca couple.

关键词： Plasma electrolytic oxidation Galvanically couple material mix Corrosion resistance

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