Woo-Hyuk Lee, Geon-il Kim, Myeong-Cheol Kim, S. Ko, Yoon-Ho Lee, Ju-Seung Song, Jung-Gu Kim
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Effect of Tri-Metallic Micro-galvanic Corrosion on Localized Corrosion Based on Numerical Simulation: Geometric Effect of Intermetallic Compounds
This study investigated the corrosion behavior of ADC12 and A365 aluminum alloys for automotive parts in the context of the growing use of aluminum parts in electric vehicles. Only ADC12 exhibited the formation of Al(OH)3 particle layer after corrosion, which was attributed to the micro-galvanic effect influenced by the geometry characteristics of its microstructure. Results revealed that ADC12 was prone to the formation of Al(OH)3 particle layers due to the geometric effects of Si and θ-Al2Cu, which facilitates the isolation of α-Al. The distribution of band-shaped galvanic currents, concentrated in a small α-Al matrix region, was primarily governed by the geometry of Si, creating a preferred structure for α-Al isolation. Additionally, the geometry of θ-Al2Cu contributed to a significant increase in electrochemical kinetics, particularly at the tri-metallic coupled region, further enhancing the susceptibility of the isolation. As a result, the formation of the Al(OH)3 particle layer was attributed to the corrosion of isolated α-Al particles, generated through the synergistic effect of micro-galvanic corrosion. Moreover, the corrosion attack progressed along the eutectic Si network, accompanied by θ-Al2Cu. Overall, the corrosion mechanism of ADC12 and A365 alloy was proposed.
期刊介绍:
CORROSION is the premier research journal featuring peer-reviewed technical articles from the world’s top researchers and provides a permanent record of progress in the science and technology of corrosion prevention and control. The scope of the journal includes the latest developments in areas of corrosion metallurgy, mechanisms, predictors, cracking (sulfide stress, stress corrosion, hydrogen-induced), passivation, and CO2 corrosion.
70+ years and over 7,100 peer-reviewed articles with advances in corrosion science and engineering have been published in CORROSION. The journal publishes seven article types – original articles, invited critical reviews, technical notes, corrosion communications fast-tracked for rapid publication, special research topic issues, research letters of yearly annual conference student poster sessions, and scientific investigations of field corrosion processes. CORROSION, the Journal of Science and Engineering, serves as an important communication platform for academics, researchers, technical libraries, and universities.
Articles considered for CORROSION should have significant permanent value and should accomplish at least one of the following objectives:
• Contribute awareness of corrosion phenomena,
• Advance understanding of fundamental process, and/or
• Further the knowledge of techniques and practices used to reduce corrosion.