Difference in the Precursory Process of the Intergranular Corrosion of Aged Al-Cu and Al-Cu-Mg Alloys in 0.1 M NaCl
Year: 2023
Type: article
Abstract: 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 (Al 2 Cu for Al-4.5Cu and Al 2 CuMg for Al-4.5Cu-1.5Mg). The discoloration of Al 2 Cu particles was localized and occurred only on a small number of particles. However, almost all Al 2 CuMg particles were discolored; the overall surface of the particles was discolored uniformly. The discoloration of Al 2 Cu on Al-4.5Cu led to micropitting. In contrast, the discoloration of Al 2 CuMg 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.
Institutions: Tohoku University, UACJ Corporation (Japan)
Language: English
Subfield: Metals and Alloys
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $1,785
Awards: Creation of Smart Alloys with Anticorrosion Functions: A Change in Concept from Solid Solution of Corrosion-Resistant Elements to Secondary Phases, Development of high corrosion resistant stainless steels utilizing second phase and analysis of electrochemical reactions at the nanometer level
OpenAlex ID: W4387899360