Galvanic weld metal-base metal corrosion in AZ31 magnesium weldments

C. E. Cross, P. Xu, D. Eliezer, G. Ben-Hamu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

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.

Original languageEnglish
Title of host publicationCorrosion, Processes and Advanced Materials in Industry
PublisherTrans Tech Publications Ltd
Pages39-42
Number of pages4
ISBN (Print)0878492895, 9780878492893
DOIs
StatePublished - 1 Jan 2010
Event3rd (Israel) International Conference Corrosion, Advanced Materials and Processes in Industry - Beer-Sheva, Israel
Duration: 29 May 200731 May 2007

Publication series

NameAdvanced Materials Research
Volume95
ISSN (Print)1022-6680

Conference

Conference3rd (Israel) International Conference Corrosion, Advanced Materials and Processes in Industry
Country/TerritoryIsrael
CityBeer-Sheva
Period29/05/0731/05/07

Keywords

  • Alloy AZ31
  • Galvanic corrosion
  • Magnesium
  • Weld zones

ASJC Scopus subject areas

  • Engineering (all)

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