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Influence of Fe-rich intermetallics and their segregation on anodising properties of Al-Si-Mg rheocast alloys
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-8098-4788
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0003-2924-137X
2021 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 422, article id 127570Article in journal (Refereed) Published
Abstract [en]

During rheocasting of Al alloys, the component's surface can be enriched in Fe-rich intermetallics due to the surface liquid segregation or the interaction with the die material. Although this precipitates enrichment affects only the surface, it can have a big impact on the quality of the surface treatments or durability. In this paper, the effect of Fe-rich intermetallics on the hardness and corrosion resistance of the anodized layer of AlSiMg alloys was examined by using nanoindentation and electrochemical impedance spectroscopy (EIS) techniques. A sulfuric acid anodising process was performed on unground and mechanical ground surfaces of TX630 substrates produced by the rheocasting process. During anodising, Fe-rich intermetallics can be dissolved, leaving voids in the oxide during its growth. The anodised samples with two different oxide layer thickness (4 and 7 μm) were tested by EIS in 3 wt-% NaCl solution for 12 h. A comparison of the EIS results of unground and mechanically ground surfaces demonstrated that the mechanical grinding successfully removed the Fe enriched layer, improving corrosion protection of the anodised oxide. Moreover, the hardness measurements indicate that the oxide layer on the mechanically ground surface with low Fe content shows higher hardness than on the unground surface with high Fe content.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 422, article id 127570
Keywords [en]
Anodising, Corrosion protection, Fe-rich intermetallics, Rheocasting, Aluminum alloys, Aluminum corrosion, Corrosion resistance, Corrosion resistant alloys, Electrochemical corrosion, Electrochemical impedance spectroscopy, Hardness, Intermetallics, Magnesium alloys, Silicon alloys, Sodium chloride, Surface segregation, Surface treatment, Al-alloy, Al-Si-Mg, Electrochemical-impedance spectroscopies, Fe content, Ground surfaces, Liquid segregation, Properties of Al, Rheocast alloys
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-54243DOI: 10.1016/j.surfcoat.2021.127570ISI: 000685607200071Scopus ID: 2-s2.0-85111728867Local ID: HOA;;757646OAI: oai:DiVA.org:hj-54243DiVA, id: diva2:1585179
Funder
Knowledge Foundation, 20170066Available from: 2021-08-16 Created: 2021-08-16 Last updated: 2021-09-02Bibliographically approved

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Zhu, BaiweiZanella, Caterina

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