J. Mater. Sci. Technol. ›› 2025, Vol. 228: 172-188.DOI: 10.1016/j.jmst.2024.12.025

• Research article • Previous Articles     Next Articles

Influence of in-situ precipitation on corrosion behaviors of wire arc directed energy deposited Al-Mg(-Sc-Zr)

Yubin Zhoua, Zewu Qia,b,*, Baoqiang Conga, Yuan Zhaoa, Wei Guoa, Zihao Jianga, Hongwei Lia,c, Chaofang Dongd, Yucheng Jid, Xing Hee, Haibo Wangf, Sanbao Linb, Xiaoyu Caib, Bojin Qia,*   

  1. aSchool of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China;
    bState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;
    cBeijing Hangxing Machinery Manufacturing Co.Ltd, Beijing 100013, China;
    dBeijing Advanced Innovation Center for Materials Genome Engineering, Key Laboratory for Corrosion and Protection (MOE), Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;
    eKey Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;
    fSchool of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144, China
  • Received:2024-09-27 Revised:2024-12-18 Accepted:2024-12-31 Published:2025-09-01 Online:2025-09-01
  • Contact: *E-mail addresses: qizewu@buaa.edu.cn (Z. Qi), qbj@buaa.edu.cn (B. Qi)

Abstract: The influence of in-situ precipitation on corrosion behaviors of wire arc directed energy deposited (WADED) Al-Mg-(Sc-Zr) was studied. WADED Al-Mg showed a homogeneous microstructure with coarse equiaxed grains. WADED Al-Mg-Sc-Zr exhibited fine equiaxed grains along the molten pool boundary (MPB) and inter-layer zone (ITZ) while coarse equiaxed grains were inside the molten pool. The in-situ precipitation resulted in the primary Al3(Sc, Zr) aggregated along MPB and ITZ while minor-sized secondary Al3(Sc, Zr) existed inside the molten pool. WADED Al-Mg-Sc-Zr showed improved electrochemical behavior than Al-Mg. WADED Al-Mg presented random pittings that occurred near dispersed β-Al3Mg2. WADED Al-Mg-Sc-Zr exhibited pittings along MPB and ITZ, where Al3(Sc, Zr) aggregated and induced galvanic corrosion. Corrosion anisotropy was obvious in Al-Mg-Sc-Zr since more MPBs and ITZs make the XOZ plane susceptive to localized corrosion.

Key words: In-situ precipitating behavior, Layered corrosion, Corrosion anisotropy, Microstructure, WADED Al-Mg-Sc-Zr alloy