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Journal of Magnesium and Alloys 2024年第4期12卷 1386-1405页

作者： Peng Xie Carsten Blawert Maria Serdechnova Natalia Konchakova tatsiana shulha Ting Wu Mikhail L.Zheludkevich Institute of Surface Science Helmholtz-Zentrum HereonMax-Planck Strasse 121502 GeesthachtGermany Institute for Materials Science Faculty of EngineeringKiel UniversityKaiserstrasse 224143 KielGermany

In this paper,the formation process,morphology,and electrochemical performance of PEO coatings on AM50 magnesium alloy prepared in low concentration phosphate,aluminate,and phosphate-aluminate electrolytes were systematically *** results show that the coatings prepared from the phosphate electrolytes have a higher thickness and better corrosion resistance properties compared to the other *** coatings prepared from low concentration phosphate-aluminate mixed electrolytes have slightly thinner thickness,a similar coating structure and an order of magnitude lower value of electrochemical impedance compared with phosphate electrolyte *** Coatings prepared from low concentration aluminate electrolytes have the lowest thickness and the worst corrosion resistance properties which gets close to corrosion behavior of the bare AM50 under the same test *** application,coatings prepared from single low concentration phosphate electrolytes and low concentration phosphate-aluminate electrolytes have greater potential than single low concentration aluminate ***,reducing the electrolyte concentrations of coating forming ions too much has negative influence on the coating growth rate.

关键词： Plasma electrolytic oxidation Low concentration electrolytes Corrosion resistance AM50 magnesium alloy

LDH sealing for PEO coated friction stir welded AZ31/AA5754 materials

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Nano Materials Science 2024年第4期6卷 428-442页

作者： tatsiana shulha Maria Serdechnova Ting Wu Thymoty Naacke Gert Wiese Carsten Blawert Mikhail L.Zheludkevich Institute of Surface Science Helmholtz-Zentrum HereonMax-Planck-StraBe 121502GeesthachtGermany Faculty of Engineering CAU Kiel UniversityKaiserstraße 224143KielGermany

The need to combine various metals in light-weight constructions requires the development of coatings that prevent galvanic *** double hydroxides(LDHs)can be an example of such coatings,which were previously successfully obtained in situ on individual *** addition,the possibility of LDH growth(including LDH growth in the presence of chelating agents)on the surface of plasma electrolytic oxidation(PEO)-coated metals was previously *** PEO+LDH combination could improve both corrosion and mechanical characteristics of the *** possibility of LDHs formation in situ on the surface of PEO-coated friction stir welded(FSW)magnesium-aluminum materials(AZ31/AA5754 system was selected as a model one)was demonstrated in the presence of 1,3-diamino-2-hydroxypropane-N,N,N',N'-tetraacetic acid(DHPTA)as a chelating agent,which was selected based on analysis of respective metal-ligand compounds *** growth was achieved under ambient pressure without addition of carbonates in the *** effectiveness of the resulting coating is shown both for corrosion resistance and hardness.

关键词： Layered double hydroxides(LDHs) Plasma electrolytic oxidation(PEO) Chelating agent Welded magnesium-aluminum materials Functional coatings

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

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