Corrosion resistance in chloride solution of the AlSi10Mg alloy obtained by means of LPBF

Cabrini, Marina; Lorenzi, Sergio; Pastore, Tommaso; Testa, Cristian; Manfredi, Diego; Cattano, Giulio; Calignano, Flaviana

doi:10.1002/sia.6601

Cited by 19 publications

(18 citation statements)

References 19 publications

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“…SKPFM data are in agreement with the corrosion behavior previously reported for the AlSi10Mg manufactured by LPBF [ 6 , 7 ] UT and 2h-300 specimens are susceptible to selective attack along the melt pool boundaries, as showed by the yellow dotted line in Figure 7 ; the white dotted line in ( Figure 7 c) evidences a porosity in the correspondence of the prior edge of the melt pool, whereas the melt pools disappeared after the heat treatment. The selective attack of the edge of the melt pool is promoted by galvanic coupling due to the high Volta potential difference between the Si and α-Al phases [ 7 ].…”

Section: Resultssupporting

confidence: 90%

“…In the last few years many studies have investigated the effect of heat treatment on the corrosion behavior of AlSi10Mg alloy obtained by means of laser powder bed fusion (LPBF) [ 6 , 7 ], also known with trade names as direct metal laser sintering (DMLS) [ 8 , 9 , 10 , 11 ] or selective laser melting (SLM) [ 10 , 12 , 13 , 14 , 15 ]. The corrosion resistance of the LPBF alloys is affected by different factors including the effect of the 3D printed surface [ 16 , 17 ] and that of the microstructure [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Heat Treatment on Microstructure and Selective Corrosion of LPBF-AlSi10Mg by Means of SKPFM and Exo-Electron Emission

et al. 2021

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The paper deals with the evolution of the microstructure of AlSi10Mg alloy obtained by laser powder bed fusion (LPBF), as a function of the post-processing heat treatment temperature. This was approached by complementary methods including FE-scanning electron microscopy, scanning Kelvin probe force microscopy and exo-electron emission techniques. The fast cooling rate of the LPBF process as compared to traditional casting produces a very fine microstructure with high mechanical properties and corrosion resistance. However, the LPBF-AlSi10Mg alloy can be susceptible to selective corrosion at the edge of the melt pools generated by the laser scan tracks. Post-process thermal treatments of the Al alloy induce a marked modification of the silicon network at melt pool edges, in particular at high temperature such as 400 °C. It was found that this is associated to a more homogeneous distribution of Volta potential. Analysis of exo-electron emission confirms the silicon diffusion during thermal treatment. The modification of the silicon network structure of the LPBF-AlSi10Mg during thermal treatment reduces the susceptibility to selective corrosion.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Microstructure and Selective Corrosion of LPBF-AlSi10Mg by Means of SKPFM and Exo-Electron Emission

et al. 2021

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“…The SLM of the following aluminium alloys has been investigated: Al-Cu, [156][157][158] Al-Zn, 159 AlSi12, [160][161][162][163] AlSi50, 164 and AlSi10Mg, 70,115,[165][166][167][168][169][170][171][172] with AlSi10Mg receiving the most attention.…”

Section: Al-based Alloysmentioning

confidence: 99%

Corrosion of metallic materials fabricated by selective laser melting

Kong

2019

npj Mater Degrad

186

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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 negative consequence of this issue is prevented by a shoot peening applied to surface [38]. Cabrini et al [82] performs potentiodynamic tests on a AlSi10Mg alloy obtained by LPBF process, observing that an increase of chloride solution concentration provokes a reduction of the pitting potential, with a logarithmic correlation, as indicative of a prone localized corrosion. The authors also detail the positive effect of high temperature post-processing heat treatment to selective dissolution of the α-Al phase stimulated by galvanic coupling with noble silicon precipitates wherein the corrosion morphology of localized attack modifies due to the different distribution and size of silicon phases induced by the heat treatment.…”

Section: Corrosion Resistance Of Cast Aluminum Alloys Obtained By Addmentioning

confidence: 99%

Corrosion of Cast Aluminum Alloys: A Review

Labari

Biezma

Rivero

2020

Metals

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Research on corrosion resistance of cast aluminum alloys is reviewed in this article. The effect of the main microstructural features of cast aluminum alloys such as secondary dendrite arm spacing (SDAS), eutectic silicon morphology, grain size, macrosegregation, microsegregation, and intermetallic compounds is discussed. Moreover, the corrosion resistance of cast aluminum alloys obtained by modern manufacturing processes such as semi-solid and additive manufacturing are analyzed. Finally, the protective effects provided by different coatings on the aluminum cast alloys—such as anodized, plasma electrolytic oxidation (PEO), and laser—is reviewed. Some conclusions and future guidelines for future works are proposed.

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Corrosion resistance in chloride solution of the AlSi10Mg alloy obtained by means of LPBF

Cited by 19 publications

References 19 publications

Effect of Heat Treatment on Microstructure and Selective Corrosion of LPBF-AlSi10Mg by Means of SKPFM and Exo-Electron Emission

Effect of Heat Treatment on Microstructure and Selective Corrosion of LPBF-AlSi10Mg by Means of SKPFM and Exo-Electron Emission

Corrosion of metallic materials fabricated by selective laser melting

Corrosion of Cast Aluminum Alloys: A Review

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