Corrosion Characteristics in Weld Heat-affected Zone of Al-Zn-Mg Alloy(Materials, Metallugy & Weldability)

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概要

• 論文の詳細を見る

• Relation between pitting potential and microstructure in weld heat-affected zone (HAZ) of a commercial Al-Zn-Mg alloy (7NO1-T6 alloy) was investigated by means of resistivity measurement, transmission electron microscopy and anodic polarization measurement in 1M NaCl solution. As the specimens solution-treated at 653K were aged at 483K and 523K for various times, the resistivity change due to the precipitation of η' phase and η phase was related to the pitting potential in anodic polarization measurement. As the 7NO1-T6 alloy was heated at various temperatures for 60 sec, the pitting potential also decreased with increasing heating temperature. This result means that the pitting potential increased with decreasing solute concentration of Zn and Mg in the matrix. The specimen was welded by using DCSP TIG welding procedure in helium gas at the heat input of 2300KJ/m. The resistivity measurement was carried out by using isochronal annealing technique for the specimen in each part of the HAZ. The resistivity in the region at 0-25 mm from the bond region was higher than that of base metal (T6), and the solute concentration of Zn and Mg in the region was high. The pitting potential in each part of the HAZ was also measured, and the potential in the region of 0-25 mm away from the bond region was lower than that of base metal.

• 大阪大学の論文

著者

• KURODA Toshio

  Osaka University

• ENJO Toshio

  Osaka University

• Enjo T

  Osaka University

• Enjo Toshio

  Welding Research Institute Osaka University

• Kuroda T

  Osaka University

• KANAMITSU Shinya

  Osaka University

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