【公開日：2023.07.31】【最終更新日：2023.05.16】
課題データ / Project Data
課題番号 / Project Issue Number
22UT0387
利用課題名 / Title
その場断続陽極分極と機械学習法によるアルミニウム合金の局部腐食機構の解明と予測モデルの開発
利用した実施機関 / Support Institute
東京大学 / Tokyo Univ.
機関外・機関内の利用 / External or Internal Use
内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）その他/Others（副 / Sub）-
キーワード / Keywords
アルミニウム基合金,電子顕微鏡/Electron microscopy
利用者と利用形態 / User and Support Type
利用者名（課題申請者）/ User Name (Project Applicant)
WU KAIGE
所属名 / Affiliation
東京大学
共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes
ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes
利用形態 / Support Type
（主 / Main）機器利用/Equipment Utilization（副 / Sub）-
利用した主な設備 / Equipment Used in This Project
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
In this work, an intermittent anodic polarization (IAP) test approach was explored to study the linkage between the local microstructure and localized corrosion properties on aluminum alloy 5083 (AA5083). The unique test procedure allows periodical triggering and repassivation of single pit events at the different pitting potentials on the traceable different local microstructures. Therefore, the localized corrosion susceptibility of different local microstructures could be quantitatively compared according to the corresponding pitting potential.
実験 / Experimental
The general test procedure was conducted using the potentiodynamic polarization method based on electrochemical measurements. The anodic polarization was immediately interrupted when a pit was initiated, which was followed by the repassivation of the pit. Then, restarting the anodic polarization from the previous pitting potential will trigger another pit at a different microstructure. Likewise, different microstructures involved in localized corrosion were labeled by the different pitting potentials.
結果と考察 / Results and Discussion
Figure 1 shows the morphological analysis of different local microstructures of intermetallic particles (IMPs) and the involved corrosion events of pitting. Obviously, different local microstructure exhibits distinct resistance to localize corrosion. Suggestively, the localized corrosion susceptibility of metal is determined by various microstructural factors including electrical, chemical, electrochemical, and geometric parameters, which are under ongoing investigations.
図・表・数式 / Figures, Tables and Equations
Fig. 1 Analysis of different local microstructures involved in pitting corrosion at different pitting potential on AA5083 alloy in 3.5 wt.% NaCl solution at room temperature.
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
This work was partially supported by Grant-in-Aid from Japan Aluminium Association (JAA) and JSPS KAKENHI Grant Number JP21K14435.
成果発表・成果利用 / Publication and Patents
論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
- Kaige Wu, Manabu Enoki, Microstructure sequencing through an intermittent anodic polarization (IAP) approach for metal localized corrosion, The 171st JIM meeting, Fukuoka, Sep. 21, 2022.
- Kaige Wu, Nobu Yatagai, Kaita Ito, Takayuki Shiraiwa, Manabu Enoki, AE-driven insight into the critical steps in localized corrosion initiation of Mg and Al alloys, IAES26, Kawasaki, Nov. 2, 2022.
- Kaige Wu, Nobu Yatagai, Takayuki Shiraiwa, Manabu Enoki, Statistical analysis of local microstructures initiating pitting corrosion by particle analysis and intermittent anodic polarization, JIM Annual Spring Meeting 2023 (172nd), Tokyo, Japan, Sep. March 10, 2023.
特許 / Patents
特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件