Hard Anodizing and Plasma Electrolytic Oxidation of an Additively Manufactured Al-Si alloy

Mora-Sanchez, Hugo; Olmo, R. del; Rams, J.; Torres, B.; Mohedano, M.; Matykina, E.; Arrabal, R.

doi:10.1016/j.surfcoat.2021.127339

Cited by 37 publications

(18 citation statements)

References 60 publications

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“…Closer to the PEO outer surface, the Si-rich phase appears, and it is completed by the sponge-like structure with a high Si-O-content (yellow). This is in agreement with recent findings for PEO on Al10Si1Mg SLM alloys (Mora-Sanchez et al, 2021). Moreover, all of the coated samples exhibit good adhesion to the substrate within the cross-sectional view.…”

Section: Examination Of the Surfacessupporting

confidence: 92%

“…These values are somewhat lower than reported in (Aboulkhair et al, 2016;Cabrini et al, 2016a;Trevisan et al, 2017), and more comparable to values reported for SR and WQ treatment, whereas the WQ treatment includes an annealing step (Cabrini et al, 2016a). The E-modulus E IT seems to be almost unaffected by the SR treatment and in the rage reported in the literature (Mora-Sanchez et al, 2021). All observed PEO coatings exhibit comparable displacement curves with a clear decrease of depth (lower panel of Figure 5).…”

Section: Mechanical Characterization Of the Surfacessupporting

confidence: 81%

“…Here, an instrumented universal hardness tester (Helmut Fischer, Sindelfingen, Germany, HM 2000) operated with a Vickers pyramid was used according to ISO 14577-1 by operating in the load-controlled mode by applying a maximal load of 100 mN for 20 s. From the disloading curve the intrusion modulus E it was determined taking into account the Poisson's ratio of 0.34 for Al and 0.22 for Al 2 O 3 , as it is described in (Mora-Sanchez et al, 2021) and references therein. All data presented are the mean values of ten measurements.…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the crystallinity and microhardness of the 3Dcoated sample were reported to be slightly higher than those of the corresponding cast alloy. Recently, it was reported that PEO coatings on Al10Si1Mg AM alloys are more uniform in comparison with those produced on the cast alloy (Mora-Sanchez et al, 2021). Furthermore, these PEO coatings showed superior mechanical properties to those of the bare surface or the hard anodized coatings, suggesting that the PEO technique is a promising solution to improving the wear of SLM printed components.…”

Section: Introductionmentioning

confidence: 99%

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Advanced Corrosion Protection of Additive Manufactured Light Metals by Creating Ceramic SurfaceThrough CERANOD® Plasma Electrolytical Oxidation Process

Jantimapornkij¹,

Zerrer²,

Buling³

2021

Front. Chem. Eng.

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Lightweight structures produced by additive manufacturing (AM) technology such as the selective laser melting (SLM) process enable the fabrication of 3D structures with a high degree of freedom. A printed component can be tailored to have specific properties and render possible applications for industries such as the aerospace and automotive industries. Here, AlSi10Mg is one of the alloys that is currently used for SLM processes. Although the research with the aim improving the strength of AM aluminum alloy components is rapidly progressing, corrosion protection is scarcely addressed in this field. Plasma electrolytic oxidation (PEO) is an advanced electrolytical process for surface treatment of light metals such as aluminum, magnesium, and titanium. This process produces an oxide ceramic-like layer, which is extremely hard but also ductile, and significantly improves the corrosion and wear behavior. The aim of this study is to understand the corrosion behavior of 3D-printed AlSi10Mg alloy and to improve its corrosion resistance. For this reason, the properties of CERANOD®—PEO coating on an AlSi10Mg alloy produced by SLM were investigated on different AM surfaces, i.e., as-built, polished and stress relieved specimens. The corrosion performance of these surfaces was analyzed using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, and long-term immersion tests. Moreover, the microstructure and morphology of the resulting coatings were characterized by SEM/EDS, taking into account the corrosive attacks. The results exhibited a high amount of localized corrosion in the case of the uncoated specimens, while the PEO process conducted on the aluminum AM surfaces led to enclosed homogeneous coatings by protecting the material’s pores, which are typically observed in AM process. Thereby, high corrosion protection could be achieved using PEO surfaces, suggesting that this technology is a promising candidate for unleashing the full potential of 3D light metal printing.

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Section: Examination Of the Surfacessupporting

confidence: 92%

Section: Mechanical Characterization Of the Surfacessupporting

confidence: 81%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Advanced Corrosion Protection of Additive Manufactured Light Metals by Creating Ceramic SurfaceThrough CERANOD® Plasma Electrolytical Oxidation Process

Jantimapornkij¹,

Zerrer²,

Buling³

2021

Front. Chem. Eng.

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“…This is very important for applications of the structure as a catalyst support. From an industrial point of view, PEO is preferable because it does not require a special pretreatment of the metallic material [19,20].…”

Section: Introductionmentioning

confidence: 99%

CO Oxidation over Pd Catalyst Supported on Porous TiO2 Prepared by Plasma Electrolytic Oxidation (PEO) of a Ti Metallic Carrier

et al. 2022

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A porous TiO2 layer was prepared with the plasma electrolytic oxidation (PEO) of Ti. In a further step, Pd was deposited on the TiO2 surface layer using the adsorption method. The activity of the Pd/TiO2/Ti catalyst was investigated during the oxidation of CO to CO2 in a mixture of air with 5% CO. The structure of the catalytic active layer was studied using a scanning electron microscope equipped with an energy dispersive spectrometer (SEM-EDS), time-of-flight secondary ion mass spectrometry (TOF-SIMS), inductively coupled plasma mass spectrometry (ICP-MS), and X-ray diffraction (XRD). The PEO process provided a porous TiO2 layer with a uniform thickness in the range of 5–10 µm, which is desirable for the production of Pd-supported catalysts. A TOF-SIMS analysis showed the formation of Pd nanoparticles after the adsorption treatment. The conversion of CO to CO2 in all samples was achieved at 150–280 °C, depending on the concentration of Pd. The composition of Pd/ TiO2/Ti was determined using ICP-MS. The optimum concentration of Pd on the surface of the catalyst was approximately 0.14% wt. This concentration was obtained when a 0.4% PdCl2 solution was used in the adsorption process. Increasing the concentration of PdCl2 did not lead to a further improvement in the activity of Pd/ TiO2/Ti.

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Investigation of plasma electrolytic oxidation coating formed on two Al–Si–Mg alloys via advanced X-ray computed tomography

Li,

Zhang,

et al. 2023

J Mater Sci

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Hard Anodizing and Plasma Electrolytic Oxidation of an Additively Manufactured Al-Si alloy

Cited by 37 publications

References 60 publications

Advanced Corrosion Protection of Additive Manufactured Light Metals by Creating Ceramic SurfaceThrough CERANOD® Plasma Electrolytical Oxidation Process

Advanced Corrosion Protection of Additive Manufactured Light Metals by Creating Ceramic SurfaceThrough CERANOD® Plasma Electrolytical Oxidation Process

CO Oxidation over Pd Catalyst Supported on Porous TiO2 Prepared by Plasma Electrolytic Oxidation (PEO) of a Ti Metallic Carrier

Investigation of plasma electrolytic oxidation coating formed on two Al–Si–Mg alloys via advanced X-ray computed tomography

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