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LDH conversion films for active protection of AZ31 mg alloy

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Journal of magnesium and Alloys 2023年第1期11卷 201-216页

作者： B.Pillado B.mingo R.del Olmo E.matykina A.m.Kooijman Y.Gonzalez−Garcia R.Arrabal m.mohedano Departamento de Ingeniería Química y de materiales Facultad de Ciencias QuímicasUniversidad ComplutenseMadrid 28040Spain Department of materials University of ManchesterOxford RoadManchester M139PLUK Institute of Optoelectronics Military University of Technology2 Kaliskiego Str.Warsaw 00-908Poland materials Science and Engineering Department Delft University of TechnologyMekelweg 2Delft 2628 CDthe Netherlands

Zinc aluminium(Zn-Al)and lithium aluminium(Li-Al)–layered double hydroxides(LDH)coatings with incorporated inhibitors(Li-,mo-and W-based)were successfully synthesized on AZ31 mg ***-Al LDH W and Li-Al LDH Li showed the highest corrosion resistance and were selected for further *** cross-section examination revealed a bi-layer structure composed of an outer part with loose flakes and a denser inner ***,FTIR,and XPS analysis confirmed the incorporation of the ***-treatments with corrosion inhibitors containing solutions resulted in the selective dissolution of the most external layer of the LDH coating,reducing the surface roughness,hydrophilicity and paint adhesion of the *** corrosion properties were confirmed by SVET evaluation for the Zn-Al LDH W *** proposed active corrosion mechanism involves the ion-exchange of aggressive Cl-ions,deposition of hydroxides and competitive adsorption of W-rich corrosion inhibitors.

关键词： AZ31 magnesium Layered double hydroxides Corrosion inhibitors Active corrosion protection

Recent advances in energy efficient PEO processing of aluminium alloys

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Transactions of Nonferrous metals Society of China 2017年第7期27卷 1439-1454页

作者： E.mATYKINA R.ARRABAL m.mohedano B.mINGO J.GONZALEZ A.PARDO m.C.mERINO Departamento de Ciencia de materiales Facultad de Ciencias QuímicasUniversidad Complutense28040 MadridSpain Helmholtz.Zentrum Geesthacht Magnesium Innovation CentreInstitute of Materials ResearchMax-Planck-Str.1D-21502 GeesthachtGermany

Plasma electrolytic oxidation(PEO)coatings developed under voltage-controlled mode on various commercial wrought,gravity cast and rheocast aluminium alloys were discussed with respect to enhancement of their tribological and corrosionperformance and minimization of the PEO energy *** is demonstrated that use of conventional porous anodic filmprecursors reduces the PEO energy consumption by up to50%.The wear of6082alloy with PEO coatings with addedα-Al2O3particles is two times lower compared with electrolytic hard *** long-term corrosion resistance of the PEO-coatedA356rheocast alloy is enhanced via use of a precursor and hydrophobic post-treatment.

关键词： aluminium anodizing plasma electrolytic oxidation wear corrosion

Quasi-in vivo corrosion behavior of AZ31B mg alloy with hybrid mWCNTs-PEO/PCL based coatings

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Journal of magnesium and Alloys 2022年第11期10卷 3217-3233页

作者： morteza Daavari masoud Atapour marta mohedano Hugo mora Sánchez Juan Rodríguez-Hernández Endzhe matykina Raul Arrabal Aboozar Taherizadeh Department of materials Engineering Isfahan University of Technology84156-83111 IsfahanIran Departamento de Ingeniería Química y de materiales Facultad de Ciencias QuímicasUniversidad Complutense28040 MadridSpain Institute of Polymer Science and Technology(CSIC) Polymer Functionalization GroupMadrid 28006Spain

This study investigated the effects of multi-walled carbon nanotubes(mWCNTs) and polycaprolactone(PCL) on the quasi-in vivo corrosion behavior of AZ31B mg alloy treated by plasma electrolytic oxidation(PEO). Thin(~2 μm, PCTPCL4) and thick(~60 μm, PCTPCL6) PCL layers were applied only onto the mWCNTs-PEO coating(PCT) as it showed better corrosion performance. Findings reveal that incorporation of mWCNTs induced several structural and functional modifications in the PEO coating, such as increased roughness, a thicker inner barrier layer, and reduced ***-in vivo corrosion testing was carried out under controlled temperature, p H, and fluid flow in simulated body fluid(SBF) by electrochemical impedance spectroscopy(EIS) and hydrogen evolution experiments. EIS results revealed that, after 48 h immersion, a diffusion process controlled hydration of the ceramic coatings. Comparison of the collected hydrogen after 15 days of immersion in the quasi-in vivo environment revealed that the PEO and PCT ceramic coatings decreased hydrogen generation by up to 74% and 91%, respectively, compared to non-coated ***6 coating exhibited the lowest amount of collected hydrogen(0.2 m L/cm^(2)). The thick PCL layer delayed the onset of substrate corrosion for at least 120 h, reducing the corrosion rate by 85% compared with the PCT.

关键词： AZ31B mg alloy Plasma electrolyte oxidation(PEO) multi-walled carbon nanotubes(mWCNTs) Quasi-in vivo condition Polycaprolactone(PCL)