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Influence of the Sr modification and post-treatment on corrosion resistance of oxide layer of cast Al-(low)Si alloys
Jönköping University, Sweden.
University of Trento, Italy.
Jönköping University, Sweden.
RISE - Research Institutes of Sweden, Safety and Transport, Electronics. Jönköping University, Sweden.ORCID iD: 0000-0002-7095-1907
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2017 (English)In: EUROCORR 2017 - The Annual Congress of the European Federation of Corrosion, 20th International Corrosion Congress and Process Safety Congress 2017, Asociace koroznich inzenyru z.s.- AKI - Czech Association of Corrosion Engineers , 2017Conference paper, Published paper (Refereed)
Abstract [en]

The current development of casting process makes it possible to cast low Si content aluminium alloys, which open the gate for the application of anodising on cast aluminium components. This paper aims to investigate the influence of Sr modification as well as the post-treatment on corrosion resistance of oxide layer of low Si content cast Al alloys. In the present study, designed Al-Si alloys with 5.45 wt-% Si were studied by performing electrochemical impedance spectroscopy (EIS) in 3 wt-% NaCl solution. The morphology of Si particle was determined by controlling the level of Sr. The microstructure features were evaluated by optical microscopy and scanning electron microscopy (SEM). Furthermore, focus ion beam-SEM (FIB-SEM) equipped with energy-dispersive X-ray spectroscopy (EDXS) was applied to exam the corrosion morphology and the anodised layer with Si rich eutectic phases. The EIS study revealed that the corrosion resistance of the oxide layer on cast Al alloys can be significantly influenced by the morphology of Si particle and the post-treatment. It was found that the change of Si particle morphology from flake-like to fibrous by Sr addition can substantially improve the corrosion resistance of the oxide layer in the unsealed condition due to the formation of the more compacted oxide layer with less defects. Normally, the application of a sealing step such as the hydrothermal sealing can improve the corrosion protection of the oxide layer. However, in the current study, it was found the hydrothermal sealing step leads to a significant reduce of the corrosion protection due to the generation of cracks into the oxide layer, and the hydrothermal sealing step can counteract the improvement of the corrosion protection by Sr addition. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.

Place, publisher, year, edition, pages
Asociace koroznich inzenyru z.s.- AKI - Czech Association of Corrosion Engineers , 2017.
Keywords [en]
Anodising, Cast Al-Si alloys, Corrosion resistance, EIS, FIB-SEM, Aluminum alloys, Corrosion protection, Corrosion resistant alloys, Electrochemical corrosion, Electrochemical impedance spectroscopy, Energy dispersive spectroscopy, Ion beams, Morphology, Scanning electron microscopy, Silicon alloys, Sodium chloride, Strontium, Casting process, Corrosion morphology, Energy dispersive x-ray spectroscopy, FIB SEM, Hydrothermal sealing, Sr modification, Aluminum corrosion
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-38115Scopus ID: 2-s2.0-85052280685OAI: oai:DiVA.org:ri-38115DiVA, id: diva2:1294732
Conference
Joint European Corrosion Congress 2017, EUROCORR 2017 and 20th International Corrosion Congress and Process Safety Congress 2017, 3 September 2017 through 7 September 2017
Available from: 2019-03-08 Created: 2019-03-08 Last updated: 2019-08-13Bibliographically approved

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Leisner, Peter

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