Characterization of localized corrosion of heat treated Er‐ and Zr‐containing A356 alloys in 3.5 wt% NaCl aqueous solution

Colombo, Marco; Buzolin, Ricardo Henrique; Gariboldi, Elisabetta; Vallant, Rudolf; Sommitsch, Christof

doi:10.1002/maco.201810383

Cited by 7 publications

(6 citation statements)

References 33 publications

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“…In general, the potential difference of the intermetallics present in the microstructure of E3 was comparable or lower than that the intermetallic compounds in A356 to the matrix. The reduced electrochemical potential differences measured between the Al matrix and the intermetallic compounds explain the lower tendency for corrosion localization, as observed in Figure and in previous investigations …”

Section: Resultssupporting

confidence: 83%

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SKPFM investigations of intermetallic compounds of innovative Er‐ and Zr‐containing Al–Si–Mg alloys and their influence on corrosion localization in saline solution

Colombo

Gariboldi

Morri

et al. 2019

Materials & Corrosion

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The paper aims at characterizing the influence of intermetallic compounds on the corrosion localization of innovative Al–Si–Mg Er‐ and Zr‐containing casting alloys. Samples of the investigated materials were studied by means of optical and scanning electron microscope micrographs, immersion tests, and scanning Kelvin probe force microscope (SKPFM) analyses in the T6 temper. Combination of immersion tests and SKPFM analyses allowed to identify those classes of intermetallic compounds promoting localization of the corrosion process. It was found that intermetallic compounds richer in Fe were the most critical for corrosion localization; furthermore, additions of Er caused a marked decrease of the potential difference of intermetallic compounds with respect to the Al matrix and a consequent less intense microgalvanic coupling, which translates into slower corrosion kinetics. Further, Zr additions slightly increased the potential difference of intermetallic compounds with the Al matrix, promoting a faster corrosion process.

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Section: Resultssupporting

confidence: 83%

“…It is evident that Zr‐enrichment in the measured chemical composition of the intermetallic compounds increased the potential difference with respect to the Al matrix and this could be suggested as the cause of the reduced corrosion resistance of EZ35 emerged in Colombo et al…”

Section: Resultsmentioning

confidence: 99%

SKPFM investigations of intermetallic compounds of innovative Er‐ and Zr‐containing Al–Si–Mg alloys and their influence on corrosion localization in saline solution

Colombo

Gariboldi

Morri

et al. 2019

Materials & Corrosion

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“…The effect of the corrosion resistance of Er and Zr on an A-356 alloy obtained by permanent metal mold was studied by Colombo et al [13]. By performing immersion corrosion tests, they observed that the addition of Er decreased the corrosion rate from 45.8 µg/cm 2 d to 4.2 µg/cm 2 d and they associated this improvement with the modification of the morphology of eutectic silicon from The corrosion resistance of an AlSi5Cu1Mg alloy with different La additions (0.3%, 0.6%, and 0.9%) was examined [12].…”

Section: Influence Of Addition Of Rare Earths On Corrosion Resistancementioning

confidence: 99%

“…The effect of the corrosion resistance of Er and Zr on an A-356 alloy obtained by permanent metal mold was studied by Colombo et al [13]. By performing immersion corrosion tests, they…”

Section: Corrosion Resistance Of Coatings Obtained By Different Surfamentioning

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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“…Recently, research on A356 is focused on performance improvements via multi-element microalloying and the subsequent heat treatment processes [4][5][6][7][8]. Meanwhile, rare earth elements, such as erbium, lanthanum, scandium, cerium, and europium, have been studied extensively [9][10][11][12][13]. These elements are chemically very active, and by doping them into the aluminum alloy, alloy purification, degass-ing, grain refinements, and mitigation of harmful effects from impurities could be achieved.…”

Section: Introductionmentioning

confidence: 99%

Effect of chromium content on microstructure and properties of casting Al‐7Si‐0.35Mg‐0.02Sr alloy

Ling

Shi

et al. 2022

Materialwissenschaft Werkst

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The effect of the addition of chromium between 0.1 % and 0.3 % on the structure and properties of Al-7Si-0.35Mg-0.02Sr alloy was studied. The results show that as the chromium content increases, the alloy grains are refined, and the grains appear fine equiaxed after 0.2 % chromium addition. At the same time, chromium combines with iron to form AlCrFeSi phase, which significantly improves the iron phase morphology, making it change from needle shape to fish bone shape. In the aging stage, the Al 13 Cr 4 Si 4 phase is dispersed in the alloy, and its phase relationship with the matrix is semi-coherent and non-coherent. When the chromium content continues to increase, the degree of dispersion of the Al 13 Cr 4 Si 4 phase is higher, but the performance of the alloy decreases, because the chromium containing precipitate phase consumes magnesium and silicon solute atoms from the nearby melt, making the amount of magnesium silicide decrease. The Al-7Si-0.35Mg-0.02Sr alloy with 0.2 % chromium showed the best mechanical properties (ultimate tensile strength, yield strength, elongation and hardness).

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Characterization of localized corrosion of heat treated Er‐ and Zr‐containing A356 alloys in 3.5 wt% NaCl aqueous solution

Cited by 7 publications

References 33 publications

SKPFM investigations of intermetallic compounds of innovative Er‐ and Zr‐containing Al–Si–Mg alloys and their influence on corrosion localization in saline solution

SKPFM investigations of intermetallic compounds of innovative Er‐ and Zr‐containing Al–Si–Mg alloys and their influence on corrosion localization in saline solution

Corrosion of Cast Aluminum Alloys: A Review

Effect of chromium content on microstructure and properties of casting Al‐7Si‐0.35Mg‐0.02Sr alloy

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