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Microstructure-corrosion interrelations in new low-lead and lead-free brass alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2017 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In new low-lead and lead-free brass alloys, it is not understood how the corrosion properties,such as dezincification, are related to material composition as well as annealing temperatureand duration. This study aims to fill this knowledge gap by mapping sixteen annealingconditions and three different brass alloy compositions to their respective microstructure anddezincification performance. It was found that high dezincification depth was a result ofannealing temperatures at 300°C – 400°C, which promoted precipitation of intermetallicAlAs-particles along grain boundaries, twins and lead particles as well as precipitation of β-phase along grain boundaries. Their presence was correlated to high micro additions ofaluminium or iron in the material composition. An additional compositional factorcontributing to precipitation of high amount of β-phase was low copper/zinc-ratio.

Place, publisher, year, edition, pages
2017. , 78 p.
Keyword [en]
Brass, dezincification, annealing, detrimental phases, heat treatment, microstructure
National Category
Metallurgy and Metallic Materials Corrosion Engineering
Identifiers
URN: urn:nbn:se:kth:diva-217355OAI: oai:DiVA.org:kth-217355DiVA: diva2:1155886
External cooperation
Swerea KIMAB
Educational program
Master of Science in Engineering - Materials Design and Engineering
Presentation
2017-09-08, Bergsmanssalen, Isafjordsgatan 28 A, Kista, Sverige, 15:00 (English)
Supervisors
Examiners
Available from: 2017-11-14 Created: 2017-11-09 Last updated: 2017-11-14Bibliographically approved

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Metallurgy and Metallic MaterialsCorrosion Engineering

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CiteExportLink to record
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  • apa
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