Influence of cerium on the formation of micro-galvanic corrosion elements of AZ91
Publikation: Beiträge in Sammelwerken › Aufsätze in Konferenzbänden › Forschung › begutachtet
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Influence of cerium on the formation of micro-galvanic corrosion elements of AZ91. / Zander, Daniela; Heilig, Meredith; Hort, Norbert et al.
Light Metals Technology V. Hrsg. / Hajo Dieringa; Nobert Hort; Karl Ulrich Kainer. Trans Tech Publications Ltd, 2011. S. 381-384 (Materials Science Forum; Band 690).Publikation: Beiträge in Sammelwerken › Aufsätze in Konferenzbänden › Forschung › begutachtet
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TY - CHAP
T1 - Influence of cerium on the formation of micro-galvanic corrosion elements of AZ91
AU - Zander, Daniela
AU - Heilig, Meredith
AU - Hort, Norbert
AU - Klaus, Gerald
AU - B̈hrig-Polaczek, Andreas
AU - Gröbner, Joachim
AU - Schmid-Fetzer, Rainer
PY - 2011
Y1 - 2011
N2 - Investigations of AZ91D revealed a strong influence of mainly the following microstructural parameters on corrosion: porosity, the eutectic, the Al-content of the Mg-phase as well as the volume fraction and distribution of gamma-Al12Mg17. Further an improved corrosion resistance was observed by the addition of rare earth elements. The influence of Ce on microstructure and corrosion of sand cast and high pressure die cast AZ91D with 0.5-2.0 wt.% Ce was investigated by SEM before and after potentiodynamic polarization measurements in pH7.5 (bi-distilled water adjusted with KOH). It was observed that Ce significantly improved the corrosion resistance by changing the microstructure. A strong influence of Ce on the average grain size, the fraction of the eutectic, changes in morphology and/or volume fraction of gamma Al12Mg17 and formation of a Cerich intermetallic phase was observed. Therefore, not only the chemical composition but also the change of microstructure and the formation of micro-galvanic elements influence the local corrosion mechanism of AZ91D with cerium.
AB - Investigations of AZ91D revealed a strong influence of mainly the following microstructural parameters on corrosion: porosity, the eutectic, the Al-content of the Mg-phase as well as the volume fraction and distribution of gamma-Al12Mg17. Further an improved corrosion resistance was observed by the addition of rare earth elements. The influence of Ce on microstructure and corrosion of sand cast and high pressure die cast AZ91D with 0.5-2.0 wt.% Ce was investigated by SEM before and after potentiodynamic polarization measurements in pH7.5 (bi-distilled water adjusted with KOH). It was observed that Ce significantly improved the corrosion resistance by changing the microstructure. A strong influence of Ce on the average grain size, the fraction of the eutectic, changes in morphology and/or volume fraction of gamma Al12Mg17 and formation of a Cerich intermetallic phase was observed. Therefore, not only the chemical composition but also the change of microstructure and the formation of micro-galvanic elements influence the local corrosion mechanism of AZ91D with cerium.
KW - AZ91D
KW - Cerium
KW - Corrosion
KW - Microstructure
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=79960424144&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/MSF.690.381
DO - 10.4028/www.scientific.net/MSF.690.381
M3 - Article in conference proceedings
AN - SCOPUS:79960424144
SN - 9783037851807
T3 - Materials Science Forum
SP - 381
EP - 384
BT - Light Metals Technology V
A2 - Dieringa, Hajo
A2 - Hort, Nobert
A2 - Kainer, Karl Ulrich
PB - Trans Tech Publications Ltd
ER -