Difference in the Precursory Process of the Intergranular Corrosion of Aged Al-Cu and Al-Cu-Mg Alloys in 0.1 M NaCl

Hiroki Yoshida, Masashi Nishimoto, Izumi Muto, Mai Takaya, Yoshihiko Kyo, Tadashi Minoda, Yu Sugawara

研究成果: ジャーナルへの寄稿学術論文査読

1 被引用数 (Scopus)

抄録

Real-time in situ optical microscopy observations of the initiation behavior of intergranular corrosion on artificially aged Al-4.5Cu and Al-4.5Cu-1.5Mg were performed in naturally aerated 0.1 M NaCl at pH 6.0. For both alloys, the discoloration of intermetallic particles occurred before intergranular corrosion, and a discolored coarse intermetallic particle on the grain boundary acted as the initiation site for intergranular corrosion (Al2Cu for Al-4.5Cu and Al2CuMg for Al-4.5Cu-1.5Mg). The discoloration of Al2Cu particles was localized and occurred only on a small number of particles. However, almost all Al2CuMg particles were discolored; the overall surface of the particles was discolored uniformly. The discoloration of Al2Cu on Al-4.5Cu led to micropitting. In contrast, the discoloration of Al2CuMg on Al-4.5Cu-1.5Mg caused the trenching of particles. The difference in the initiation behavior of intergranular corrosion was discussed in terms of these precursory phenomena.

本文言語英語
論文番号111501
ジャーナルJournal of the Electrochemical Society
170
11
DOI
出版ステータス出版済み - 2023

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