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Clarifying the influence of albumin on the initial stages of magnesium corrosion in Hank's balanced salt solution

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Journal of Magnesium and Alloys 2021年第3期9卷 805-817页

作者： Di Mei Cheng Wang Sviatlana V.lamaka mikhail l.zheludkevich Magnesium Innovation Centre-MagIC Institute of Materials ResearchHelmholtz-Zentrum GeesthachtGeesthacht 21502Germany Institute for Materials Science Faculty of EngineeringKiel UniversityKiel 24103Germany

The corrosion behavior of Mg,a promising biodegradable metallic material,in protein-containing pseudophysiological environment is still not fully *** this work,the influence of albumin on the corrosion behavior of commercially pure magnesium(CP Mg)is investigated during short-term tests in Hank’s Balanced Salt Solution(HBSS).This work focuses on the reactions at the Mg/medium interface from the perspective of the interactions among albumin,media components and *** evolution tests demonstrate that the physiological amount of albumin(40 g l^(-1))accelerates Mg corrosion in HBSS during the first few hours but slows down the degradation *** presence of albumin decreases the concentration of free Ca^(2+)in HBSS and delays formation of protective co-precipitation products on Mg *** evolution of local pH(differs from typically monitored bulk pH)near Mg/medium interface in albumincontaining HBSS is reported for the first *** of local and bulk pH values elucidates the pH buffering effect of albumin during the immersion *** on these results,adsorption,chelating and pH buffering effects are summarized as three important aspects of albumin influence on Mg ***,constant replenishment of medium components is shown to be an influential factor during the Mg corrosion tests.

关键词： Magnesium Corrosion Albumin Biodegradable local pH

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

Exploring the contribution of oxygen reduction reaction to Mg corrosion by modeling assisted local analysis

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Journal of Magnesium and Alloys 2023年第1期11卷 100-109页

作者： Cheng Wang Wen Xu Daniel Höche mikhail l.zheludkevich Sviatlana V.lamaka Institute of Surface Science Helmholtz-Zentrum HereonGeesthacht 21502Germany Institute for Materials Science Faculty of EngineeringKiel UniversityKiel 24103Germany

Oxygen reduction reaction(ORR)has been disclosed in recent studies as a significant secondary cathodic process during magnesium *** work elaborates on the contribution of ORR to the total corrosion process of pure Mg at different impurity levels in NaCl electrolyte with the assistance of local techniques.A finite element based numerical model taking into account the contribution of ORR during the corrosion of the Mg test materials has been designed in this study considering the local oxygen *** computational simulations were calibrated based on the experimental data and evaluated ***,the simultaneous monitoring of local concentration of H_(2) and O_(2),and the combined modeling study reveal the relation between ORR and hydrogen evolution reaction.

关键词： local oxygen concentration Oxygen reduction reaction Mg corrosion NaCl electrolyte Hydrogen evolution reaction Numerical model

Effect of low concentration electrolytes on the formation and corrosion resistance of PEO coatings on AM50 magnesium alloy

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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

Self-cleaning property of AZ31 Mg alloy during plasma electrolytic oxidation process

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Progress in Natural Science:Materials International 2019年第1期29卷 94-102页

作者： Jiaping Han Carsten Blawert Junjie Yang Xiaopeng lu Jin Hu mikhail l.zheludkevich National Key laboratory for Precision Hot Processing of Metals School of Materials Science and Engineering Harbin Institute of Technology Magnesium Innovation Centre-MagIC Institute of Materials Research Helmholtz-Zentrum Geesthacht Corrosion and Protection Division Shenyang National Laboratory for Materials Science Northeastern University

The rolling of metal sheet often leads to strong contamination of the resulting surface. The present work reports the effects of the surface contamination remaining after rolling of AZ31 Mg alloy on plasma electrolytic oxidation(PEO) treatment of the resulting sheet material. Results indicate that most of the contaminants on the surface of as-rolled AZ31 Mg alloy are removed in the early stages of PEO process. The contaminations slightly influence the phase composition of PEO coating. Non-uniform distribution of contaminations results in aggregation of pores on the surface of PEO samples. On the bare substrate the contaminations are responsible for poor wear and corrosion resistance but final PEO coatings reveals similar performance on contaminated substrate compared to the abraded one. A self-cleaning property of the PEO and possibility of one step process,avoiding pre-cleaning stages, is suggested.

关键词： Intermetallics Mechanochemical processing Corrosion Electrochemical impedance spectroscopy Scanning electron microscopy

Influence of secondary phases of AlSi9Cu3 alloy on the plasma electrolytic oxidation coating formation process

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Journal of Materials Science & Technology 2020年第15期47卷 75-85页

作者： Ting Wu Carsten Blawert mikhail lzheludkevich MagIC-Magnesium Innovation Centre Helmholtz-Zentrum Geesthacht21502 GeesthachtGermany Institute of Materials Science Faculty of EngineeringKiel UniversityKaiserstrasse 224143 KielGermany

To understand the formation and growth of plasma electrolytic oxidation(PEO) coatings in presence of different secondary phases in a substrate,PEO treatment was carried out on AlSi9 Cu3 alloy at different treatment times ranging from 15 s to 480 *** coating formation and evolution process was traced by surface and cross-sectional observation of the layers on the different phases of the *** results demonstrated a sequential involvement of the different phases in the plasma discharges:firstly,discharges start on the α-Al matrix,then on the intermetallic Al2 Cu and β-Al5 FeSi phases at the same time and finally on the eutectic *** presence of intermetallic Al2 Cu remarkably affects the initial dissolution,the deposition of conversion products and the ignition of discharges at the early stages of *** Si in the substrate exhibits the highest electrochemical stability at all stages and contributes in the beginning to a distinct coating morphology *** resultant PEO coating tends to be uniform if processing times are longer and a double-layer structure appears in the coating.

关键词： Plasma electrolytic oxidation Aluminum alloy Secondary phases

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

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

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