TY - GEN
T1 - Galvanic weld metal-base metal corrosion in AZ31 magnesium weldments
AU - Cross, C. E.
AU - Xu, P.
AU - Eliezer, D.
AU - Ben-Hamu, G.
PY - 2010/1/1
Y1 - 2010/1/1
N2 - Arc welds were made on wrought AZ31 magnesium plate using a variable polarity gas-tungsten arc process with AZ61 filler wire. The aluminum content of the weld metal was systematically varied using inserts pre-placed in the weld joint, machined from magnesium die-cast alloys AM20, AM50, AM60, and AZ91. When immersed in 3.5% NaCl + Mg(OH)2 solution at room temperature, pitting corrosion was found to initiate in the weld heat affected zone, spread briefly to the weld metal, and then concentrate in the base metal. Galvanic couples were examined between wrought AZ31 and die-cast alloys to further examine galvanic behavior between wrought and cast materials. Results showed that the cast material was anodic relative to the wrought material over long periods of time, unlike what was observed for weldments. Details of this study will be presented and results will be related to alloy aluminum content and the ability to passivate.
AB - Arc welds were made on wrought AZ31 magnesium plate using a variable polarity gas-tungsten arc process with AZ61 filler wire. The aluminum content of the weld metal was systematically varied using inserts pre-placed in the weld joint, machined from magnesium die-cast alloys AM20, AM50, AM60, and AZ91. When immersed in 3.5% NaCl + Mg(OH)2 solution at room temperature, pitting corrosion was found to initiate in the weld heat affected zone, spread briefly to the weld metal, and then concentrate in the base metal. Galvanic couples were examined between wrought AZ31 and die-cast alloys to further examine galvanic behavior between wrought and cast materials. Results showed that the cast material was anodic relative to the wrought material over long periods of time, unlike what was observed for weldments. Details of this study will be presented and results will be related to alloy aluminum content and the ability to passivate.
KW - Alloy AZ31
KW - Galvanic corrosion
KW - Magnesium
KW - Weld zones
UR - http://www.scopus.com/inward/record.url?scp=76449105695&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/amr.95.39
DO - 10.4028/www.scientific.net/amr.95.39
M3 - Conference contribution
AN - SCOPUS:76449105695
SN - 0878492895
SN - 9780878492893
T3 - Advanced Materials Research
SP - 39
EP - 42
BT - Corrosion, Processes and Advanced Materials in Industry
PB - Trans Tech Publications Ltd
T2 - 3rd (Israel) International Conference Corrosion, Advanced Materials and Processes in Industry
Y2 - 29 May 2007 through 31 May 2007
ER -