Microstructure and corrosion of AZ91 with small amounts of cerium
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Microstructure and corrosion of AZ91 with small amounts of cerium. / Zander, D.; Heilig, M.; Hort, N. et al.
Magnesium Technology 2010 - Held During TMS 2010 Annual Meeting and Exhibition. Hrsg. / Sean R. Agnew; Neale R. Neelameggham; Eric A. Nyberg; Wim H. Sillekens. John Wiley & Sons Inc., 2010. S. 187-191 (Magnesium Technology).Publikation: Beiträge in Sammelwerken › Aufsätze in Konferenzbänden › Forschung › begutachtet
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TY - CHAP
T1 - Microstructure and corrosion of AZ91 with small amounts of cerium
AU - Zander, D.
AU - Heilig, M.
AU - Hort, N.
AU - Klaus, G.
AU - Buehrig-Polaczek, A.
AU - Grbbner, J.
AU - Schmid-Fetzer, R.
PY - 2010
Y1 - 2010
N2 - Recent investigations of magnesium-aluminum alloys revealed a strong influence of four key microstructural parameters on corrosion: porosity, volume fraction, distribution and Al-content of the γ-Al12Mg 17 phase. Additionally, an improved corrosion resistance was observed by the addition of rare earth elements. The influence of cerium on the casting skin, inner microstructure, and corrosion of sand-cast and die-cast AZ91D with 0.5-2.0 wt.% cerium was investigated by SEM before and after potentiodynamic measurements and electrochemical impedance spectroscopy in pH8 and pHll. Cerium significantly improved the corrosion resistance through formation of a passive layer. Strong influences of cerium on the microstructure (average grain size, changes in morphology and/or volume fraction of Mg17Al12 particles, and formation of cerium-rich intermetallic phases) were observed. Microstructural influences as well as the change in chemical composition alter the local corrosion mechanism and passive layer formation in AZ91D augmented with cerium.
AB - Recent investigations of magnesium-aluminum alloys revealed a strong influence of four key microstructural parameters on corrosion: porosity, volume fraction, distribution and Al-content of the γ-Al12Mg 17 phase. Additionally, an improved corrosion resistance was observed by the addition of rare earth elements. The influence of cerium on the casting skin, inner microstructure, and corrosion of sand-cast and die-cast AZ91D with 0.5-2.0 wt.% cerium was investigated by SEM before and after potentiodynamic measurements and electrochemical impedance spectroscopy in pH8 and pHll. Cerium significantly improved the corrosion resistance through formation of a passive layer. Strong influences of cerium on the microstructure (average grain size, changes in morphology and/or volume fraction of Mg17Al12 particles, and formation of cerium-rich intermetallic phases) were observed. Microstructural influences as well as the change in chemical composition alter the local corrosion mechanism and passive layer formation in AZ91D augmented with cerium.
KW - AZ91
KW - Corrosion
KW - Microstructure
KW - Rare earth elements
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=77952362158&partnerID=8YFLogxK
M3 - Article in conference proceedings
AN - SCOPUS:77952362158
SN - 9780873397469
T3 - Magnesium Technology
SP - 187
EP - 191
BT - Magnesium Technology 2010 - Held During TMS 2010 Annual Meeting and Exhibition
A2 - Agnew, Sean R.
A2 - Neelameggham, Neale R.
A2 - Nyberg, Eric A.
A2 - Sillekens, Wim H.
PB - John Wiley & Sons Inc.
T2 - Magnesium Technology 2010 - TMS 2010 Annual Meeting and Exhibition
Y2 - 14 February 2010 through 18 February 2010
ER -