Corrosion behaviour of zinc–cerium alloys: Role of intermetallic phases

[Display omitted] ► Synthesis and casting of ZnCe alloys up to 5 wt.% Ce. ► Cerium is exclusively present in Zn 11Ce phase, dispersed in the zinc matrix. ► Zn 11Ce phase acts as a tank of cerium to form a Ce-enriched passive layer. ► The optimum Ce concentration is about 1.5 wt.%. New zinc–cerium al...

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Bibliographic Details
Published in:Corrosion science 2011-05, Vol.53 (5), p.1639-1645
Main Authors: Guessoum, Khadoudj, Veys-Renaux, Delphine, Rocca, Emmanuel, Belhamel, Kamel
Format: Article
Language:English
Subjects:
A. Intermetallics
A. Rare earth elements
A. Zinc
Alloys
Applied sciences
B. EIS
C. Passive films
Cerium
Corrosion
Corrosion environments
Exact sciences and technology
Intermetallic phases
Joining
Metals. Metallurgy
Optimization
Protective
Tanks
Zinc
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Summary:[Display omitted] ► Synthesis and casting of ZnCe alloys up to 5 wt.% Ce. ► Cerium is exclusively present in Zn 11Ce phase, dispersed in the zinc matrix. ► Zn 11Ce phase acts as a tank of cerium to form a Ce-enriched passive layer. ► The optimum Ce concentration is about 1.5 wt.%. New zinc–cerium alloys (up to 5 wt.%) was synthesized and their corrosion behaviour was studied in a reference corrosive media. Metallographic analyses show that cerium is exclusively present in a Zn 11Ce intermetallic phase, homogeneously dispersed in the zinc matrix. With an optimal concentration at around 1.5 wt.%, the Zn 11Ce phase acts as a tank of cerium to form a protective Ce-enriched passive layer. Nevertheless, at high Ce content, the benefit in terms of corrosion resistance obtained by the incorporation of Ce in the corrosion layer is shaded by the galvanic coupling between the intermetallic phase and the matrix.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2011.01.006