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Founded in 1987， Bimonthly
Supervisor：Jiangxi University Of Science And Technology
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Jiangxi Nonferrous Metals Society
ISSN：1674-9669
CN：36-1311/TF
CODEN YJKYA9
Volume 14 Issue 4
Aug.  2023
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ZHU Bingyao, JIA Xiaobo. Study on microstructure and corrosion resistance of an in situ Al2O3(p)/7075 alloy for automotive parts prepared by ultrasonic vibration[J]. Nonferrous Metals Science and Engineering, 2023, 14(4): 511-517. DOI: 10.13264/j.cnki.ysjskx.2023.04.009
Citation: ZHU Bingyao, JIA Xiaobo. Study on microstructure and corrosion resistance of an in situ Al2O3(p)/7075 alloy for automotive parts prepared by ultrasonic vibration[J]. Nonferrous Metals Science and Engineering, 2023, 14(4): 511-517. DOI: 10.13264/j.cnki.ysjskx.2023.04.009
shu

Study on microstructure and corrosion resistance of an in situ Al2O3(p)/7075 alloy for automotive parts prepared by ultrasonic vibration

  • 1.

    Department of Mechanical and Automotive Engineering, Liuzhou City Vocational College, Liuzhou 545006, Guangxi, China

  • 2.

    School of Microelectronics and Materials Engineering, Guangxi University of Science and Technology, Liuzhou 545006, Guangxi, China

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  • Received Date: May 06, 2022
  • Revised Date: August 24, 2022
  • Available Online: August 23, 2023
    Graphical Abstract
    • Abstract
  • SiO2 was added into 7075 alloys by ultrasonic vibration to form Al2O3 particles in situ. The microstructure, phase composition and corrosion resistance of the alloy were studied and analyzed by XRD, SEM, TEM, immersion corrosion tests and electrochemical tests, respectively. The results showed that ultrasonic vibration and in situ formation of Al2O3 particles could refine the microstructure of the alloy and disperse the agglomerated Al2O3 particles evenly, and Al2O3 particles could be used as the core of heterogeneous nucleation to improve the nucleation rate. The Al2O3(p)/7075 alloys with ultrasonic vibration are mainly composed of Al, Al2O3, Al7Cu2Fe, Al2CuMg and Mg2Zn phases. Compared with the 7075 alloys, its weight loss corrosion rate and hydrogen evolution corrosion rate decreased, the white corrosion products reduced, and the degree of pitting and intergranular corrosion weakened. The self-corrosion potential (Ecorr) and pitting potential (Ep)increased, and the corrosion current density (Icorr) decreased. The improvement in the corrosion resistance of the Al2O3(p)/7075 alloy with ultrasonic vibration is due to the coordination of the slowing corrosion rate caused by microstructure refinement and the increase in corrosion potential caused by the in situ formation of Al2O3 particles.
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    • References (25)
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