Effect of different post-treatments on the corrosion resistance and tribological properties of AZ91D magnesium alloy coated PEO

Castellanos, Alejandra; Altube, A.; Vega, Jesús Manuel; García-Lecina, Eva; Díez, Javier López; Grande, Hans‐Jürgen

doi:10.1016/j.surfcoat.2015.07.017

Cited by 70 publications

(22 citation statements)

References 43 publications

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“…The AZ31 sample coated with HA for 400 V and 40 min exhibited the highest corrosion resistance . The properties of MAO‐treated surfaces can be enhanced with pretreatments, posttreatments, or if used with a combination of other coating methods . Corrosion resistance and bioactivity of Mg alloy AZ31 were improved by hydrothermally treating the MAO‐treated surface.…”

Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

“…The MAO coated Mg surfaces are often further treated with different techniques including dip coating, the sol–gel method, hydrothermal treatment, and so forth to improve the surface properties . The results have shown that MAO coatings exhibit better adhesion when coupled with the above‐mentioned surface treatment techniques.…”

Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

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The current trends of Mg alloys in biomedical applications—A review

2018

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Magnesium (Mg) has emerged as an ideal alternative to the permanent implant materials owing to its enhanced properties such as biodegradation, better mechanical strengths than polymeric biodegradable materials and biocompatibility. It has been under investigation as an implant material both in cardiovascular and orthopedic applications. The use of Mg as an implant material reduces the risk of long-term incompatible interaction of implant with tissues and eliminates the second surgical procedure to remove the implant, thus minimizes the complications. The hurdle in the extensive use of Mg implants is its fast degradation rate, which consequently reduces the mechanical strength to support the implant site. Alloy development, surface treatment, and design modification of implants are the routes that can lead to the improved corrosion resistance of Mg implants and extensive research is going on in all three directions. In this review, the recent trends in the alloying and surface treatment of Mg have been discussed in detail. Additionally, the recent progress in the use of computational models to analyze Mg bioimplants has been given special consideration.

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Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

Section: Coating Techniques Applied For Mg Alloysmentioning

confidence: 99%

The current trends of Mg alloys in biomedical applications—A review

2018

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“…In this case, the micro-porous oxide coating obtained by the PEO process can be further sealed by adding a hybrid inorganic-organic polymeric (Si-O-Si) sol-gel coating on top to provide an adequate corrosion protection on the metal surfaces [11][12][13][14][15] . Some researchers, as Tan et al 16 , Malayoglu et al 17 and Castellanos et al 18 , have addressed this strategy for the protection of Mg alloys, reporting an improvement of the corrosion resistance after a post-treatment including the deposition of a sol-gel coating. In particular, Guo et al 19 studied a sol-gel film based on GPTMS (3-Glycidyloxypropyl) trimethoxysilane), TETA (triethylenetetramine) and TEOS (tetraethoxysilane) for sealing the porous PEO layer on magnesium.…”

Section: Introductionmentioning

confidence: 99%

Integrated corrosion‐resistant system for AZ31B Mg alloy via plasma electrolytic oxidation (PEO) and sol‐gel processes

Merino

Durán

Castro

2021

Int J of Appl Glass Sci

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In this work, an integrated system that combines anodizing process with the deposition of a hybrid SiO 2 sol-gel coating was developed with the aim of improving the corrosion resistance of AZ31B Mg alloy. The optimization of the anodizing conditions using an alkaline electrolyte (NaOH) modified with different concentrations of sodium metasilicate pentahydrate were explored together with the preparation and deposition of a SiO 2 sol obtained by hydrolysis and condensation of TEOS (tetraethoxysilane), GPTMS (3-Glycidyloxypropyl) trimethoxysilane), colloidal SiO 2 nanoparticles, and 1-Methylimidazole (MI). The surface morphology, coating thickness and composition were evaluated. The anodized coatings thickness was between 1.1 and 1.7 µm with composition corresponding to magnesium oxide and low silicon content. The corrosion performance was tested in 3.5% NaCl solution. The results revealed a good corrosion resistance behaviour after the anodizing of the Mg alloys. However, the best corrosion resistance was reached when the porous PEO layer was sealed with a hybrid silica sol-gel film. A decrease in the corrosion current density of three orders of magnitude is observed between Mg alloy (1.54E-06 A/cm 2 ) and multilayer system (2.80E-8 A/cm 2 ). Moreover, the polarization resistance for 8AF+SG samples showed a quite high value (31546.8 Ω cm 2 ) compared to Mg alloy (207.3 Ω cm 2 ).

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“…One possibility of improving the wear resistance of porous PEO layers on SiC reinforced AMCs could be the infiltration of pores by sol-gels or nanoparticle reinforced polymers. Similar process combinations were recently applied to porous PEO coatings on magnesium alloys in order to improve their corrosion and wear resistance [10]. Furthermore, the application of an aluminum layer by thermal spraying enables the formation of compact wear resistant coatings on numerous substrates that are not well suited for PEO treatment [11].…”

Section: Coating Propertiesmentioning

confidence: 99%

Plasma electrolytic oxidation of AMCs

Morgenstern

Sieber

Lampke

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Aluminum Matrix Composites (AMCs) consisting of high-strength alloys and ceramic reinforcement phases exhibit a high potential for security relevant lightweight components due to their high specific mechanical properties. However, their application as tribologically stressed components is limited because of their susceptibility against fatigue wear and delamination wear. Oxide ceramic protective coatings produced by plasma electrolytic oxidation (PEO) can solve these problems and extend the possible applications of AMCs. The substrate material was powder metallurgically processed using alloy EN AW 2017 and SiC or Al 2 O 3 particles. The influence of material properties like particle type, size and volume fraction on coating characteristics is clarified within this work. An alkaline silicate electrolyte was used to produce PEO coatings with technically relevant thicknesses under bipolar-pulsed current conditions. Coating properties were evaluated with regard to morphology, chemical composition, hardness and wear resistance. The particle type proved to have the most significant effect on the coating properties. Whereas compactness and thickness are not deteriorated by the incorporation of thermodynamically stable alumina particles, the decomposition of silica particles during the PEO processes causes an increase of the porosity. The higher silica particle content decreases also the coating thickness and hardness, which leads in particular to reduction of the wear resistance of the PEO coatings. Finally, different approaches for the reduction of the coating porosity of silica reinforced AMCs are discussed.

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Effect of different post-treatments on the corrosion resistance and tribological properties of AZ91D magnesium alloy coated PEO

Cited by 70 publications

References 43 publications

The current trends of Mg alloys in biomedical applications—A review

The current trends of Mg alloys in biomedical applications—A review

Integrated corrosion‐resistant system for AZ31B Mg alloy via plasma electrolytic oxidation (PEO) and sol‐gel processes

Plasma electrolytic oxidation of AMCs

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