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Influence of size and distribution of intermetallic particles in Al-Si cast alloys on the cerium conversion coating deposition
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0003-2924-137X
2019 (English)In: Electrochem 2019, Glasgow: Abstracts book, 2019, p. 99-99Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Aluminium alloys are susceptible to corrosion due to microgalvanic coupling of the Al matrix and intermetallic particles (IMP). Among different protection strategies, conversion coatings can be selectively deposited on more noble sites. Cerium conversion coatings (CeCC) have been proven to inhibit the cathodic reaction by preferentially depositing on the cathodic IMP. Their spontaneous deposition achieved by immersion of aluminium substrate in Ce-ion containing baths is a consequence of the localised pH increase because of oxygen reduction reaction at local cathodic sites of the microstructure. The influence of bath process parameters (like cerium salt type, cerium ion concentration, pH etc.) have been widely investigated primarily on AA2024 and AA7075, but the more general role of microstructure remains to be clearly understood. Due to the localised nature of deposition reactions, the microstrucutre, in the sense of chemical composition, size and distribution of the second phase or IMP play a crucial role in the deposition behaviour. This research investigates the role of IMP size and distribution in the microstructure, i.e. how far or close they are spaced from each other, on the deposition of CeCC. Two model cast Al-7wt.% Si alloys are selected with 2wt.% Cu and 1wt.% Fe respectively. Different IM distribution in the microstructure is achieved by implementing slow and fast cooling rates for solidification of these hypoeutectic Al-Si alloys. CeCC coatings are spontaneously deposited by immersion in cerium chloride salt solutions. Bare metal and CeCC deposited microstructure is characterized with optical microscopy, scanning electron microscopy and energy dispersive x-ray spectroscopy.

Place, publisher, year, edition, pages
2019. p. 99-99
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-47182OAI: oai:DiVA.org:hj-47182DiVA, id: diva2:1381049
Conference
Electrochem 2019 Annual Meeting, 26-28 August, Glasgow, United Kingdom
Available from: 2019-12-20 Created: 2019-12-20 Last updated: 2019-12-20Bibliographically approved

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Sainis, SalilZanella, Caterina

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