TY - JOUR

T1 - Corrosion properties of secondary AZ91 alloys

AU - Blawert, C.

AU - Morales, E.

AU - Dietzel, W.

AU - Hort, N.

AU - Kainer, K. U.

AU - Scharf, C.

AU - Ditze, A.

AU - Endres, F.

N1 - Conference code: 134

PY - 2005

Y1 - 2005

N2 - The corrosion properties of AZ91 alloys are determined by the amount of impurities, enriching the alloy during the recycling process. However within reasonable costs the recycling of magnesium scrap metal results only in AZ91B quality and respectively poor corrosion behavior can be expected. This influence on the corrosion resistance was studied by controlled additions of Fe, Ni, Cu, and Si to AZ91D alloy. The corrosion properties of the gravity permanent mold castings were studied by various corrosion tests and correlated to the observed microstructure and phase composition. Most of the impurities were found as, or in, intermetallic phases. The influence on the corrosion resistance was found to be depending on the solidification behavior of the particular intermetallic phase. Altogether the corrosion test results indicate a much higher tolerance against the impurities than expected. Effects on the possible use of secondary AZ91 alloys are discussed.

AB - The corrosion properties of AZ91 alloys are determined by the amount of impurities, enriching the alloy during the recycling process. However within reasonable costs the recycling of magnesium scrap metal results only in AZ91B quality and respectively poor corrosion behavior can be expected. This influence on the corrosion resistance was studied by controlled additions of Fe, Ni, Cu, and Si to AZ91D alloy. The corrosion properties of the gravity permanent mold castings were studied by various corrosion tests and correlated to the observed microstructure and phase composition. Most of the impurities were found as, or in, intermetallic phases. The influence on the corrosion resistance was found to be depending on the solidification behavior of the particular intermetallic phase. Altogether the corrosion test results indicate a much higher tolerance against the impurities than expected. Effects on the possible use of secondary AZ91 alloys are discussed.

KW - Corrosion

KW - Impurities

KW - Magnesium alloy AZ91

KW - Secondary Alloys

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=24944515090&partnerID=8YFLogxK

M3 - Conference article in journal

AN - SCOPUS:24944515090

VL - 2005

SP - 447

EP - 450

JO - Magnesium Technology

JF - Magnesium Technology

SN - 1545-4150

T2 - 134th TMS Annual Meeting 2005

Y2 - 13 February 2005 through 17 February 2005

ER -