Influence of Si Content on the Microstructure and Corrosion Behavior of Additive Manufactured Al-Si Alloys

Revilla, Reynier I.; Graeve, Iris De

doi:10.1149/2.0101814jes

Cited by 43 publications

(68 citation statements)

References 32 publications

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“…This correlated with the coarse structure in the borders that led to the higher driving force for the galvanic corrosion and induced the corrosion attacks along the borders, where the heat-affected zones (HAZ) exhibited broken Si borders (Revilla et al, 2020). The observed corrosion mechanism is in agreement with (Revilla and Graeve, 2018), who reported the initiation of corrosion at the MPB followed by superficial spreading of the corrosion attack to adjacent zones, including the HAZ. The SR process did not notably change the macrostructure of the melting pools, therefore, the form of corrosion attack is similar to that of the untreated as-built samples but with a higher corroded area.…”

Section: Corrosion Mechanismssupporting

confidence: 72%

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: Corrosion Mechanismssupporting

confidence: 72%

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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“…9. [173][174][175] The potential of the aluminium phase was lower than that of the silicon phase, leading to galvanic corrosion and Fig. 9d displays the intercellular network of silicon in the corroded areas for the SLMed AlSi10Mg alloy in chloride solution.…”

Section: Al-based Alloysmentioning

confidence: 99%

Corrosion of metallic materials fabricated by selective laser melting

Kong

2019

npj Mater Degrad

182

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Additive manufacturing is an emerging technology that challenges traditional manufacturing methods. However, the corrosion behaviour of additively manufactured parts must be considered if additive techniques are to find widespread application. In this paper, we review relationships between the unique microstructures and the corresponding corrosion behaviour of several metallic alloys fabricated by selective laser melting, one of the most popular powder-bed additive technologies for metals and alloys. Common issues related to corrosion in selective laser melted parts, such as pores, molten pool boundaries, surface roughness and anisotropy, are discussed. Widely printed alloys, including Ti-based, Al-based and Fe-based alloys, are selected to illustrate these relationships, and the corrosion properties of alloys produced by selective laser melting are summarised and compared to their conventionally processed counterparts.

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“…The fitting results indicate the polished samples have better corrosion resistance by comparing the value of R ct , but the value of R f for the unpolished samples are larger than the polished samples, it can be inferred that the rougher surface leads to the larger area of the actual surface [86]. The EIS results in the study of Revilla et al revealed that the corrosion resistance is improved with the increasing content of Si [89].…”

Section: Electrochemical Impedance Spectrummentioning

confidence: 95%

“…During the anodic polarizati ve film might form on the electrode surface in a small potential range at which the cu ty remains constant with the growing potential, so the occurrence of the passive film ove the corrosion resistance of matrix [80]. The investigation of Revilla et al suggests tha sion potential is increasing with higher content of Si [89]. hang et al studied the polarization curves of SLM Al-12Si aluminum alloy.…”

Section: 13 X For Peer Review 11mentioning

confidence: 99%

Corrosion Behaviors of Selective Laser Melted Aluminum Alloys: A Review

Chen

Zhang

Jia

et al. 2020

Metals

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Selective laser melting (SLM) is an ideal method to directly fabricate products with high geometrical complexity. With low density and good corrosion resistance, aluminum alloys are widely used as important structural materials. Microstructures and mechanical properties of SLMed aluminum alloys have been recently widely studied. Corrosion behavior as a vital concern during the service of SLMed aluminum alloy parts has also drawn many attentions. Previous studies have found that SLM-processed aluminum alloys exhibit better corrosion resistance compared to the casted and wrought counterparts for both Al-Si alloys and high strength 2xxx Al alloys, which is mainly due to the unique microstructure features of SLMed Al alloys. For Al-Si alloys, with different shapes of Si networks, the different building planes show discrepant corrosion behaviors. Owing to the rougher surface with relatively larger numbers of defects, the as-printed surface is vulnerable to corrosion than the polished. Heat treatment has a negative effect on corrosion resistance due to the breakup of Si networks. The microstructure features correlated with the corrosion behaviors were also reviewed in this paper. Some suggestions on the future study of corrosion behaviors of SLMed Al alloys were put forward.

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Influence of Si Content on the Microstructure and Corrosion Behavior of Additive Manufactured Al-Si Alloys

Cited by 43 publications

References 32 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

Corrosion of metallic materials fabricated by selective laser melting

Corrosion Behaviors of Selective Laser Melted Aluminum Alloys: A Review

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