Microstructure and corrosion of AZ91 with small amounts of cerium

被引：0

作者：

Zander, D. ^{[1
]}

Heilig, M. ^{[1
,2
]}

Hort, N. ^{[3
]}

Klaus, G. ^{[4
]}

Buehrig-Polaczek, A. ^{[4
]}

Groebner, J. ^{[5
]}

Schmid-Fetzer, R. ^{[5
]}

机构：

[1] TU Dortmund, Dept Biochem & Chem Engn, D-44221 Dortmund, Germany

[2] Colorado Sch Mines, Dept Met & Mat Engn, Golden, CO 80401 USA

[3] GKSS Forschungszentrum Geesthacht GmbH, D-21502 Geesthacht, Germany

[4] Foundary Inst RWTH Aachen, D-52056 Aachen, Germany

[5] Tech Univ Clausthal, Inst Met, D-38678 Clausthal Zellerfeld, Germany

来源：

MAGNESIUM TECHNOLOGY 2010 | 2010年

关键词：

AZ91; rare earth elements; corrosion; microstructure; MAGNESIUM ALLOYS; SODIUM-CHLORIDE; BEHAVIOR;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 gamma-Al12Mg17 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 pH11. 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.

引用

页码：187 / +

页数：2

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