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WANG Yan, GUO Chun, KONG De-cheng, ZHAO Zhen-jiang, WANG Li, DONG Chao-fang. Microstructures and corrosion failure analysis of zinc anode[J]. Powder Metallurgy Technology, 2018, 36(5): 348-354. DOI: 10.19591/j.cnki.cn11-1974/tf.2018.05.005
Citation: WANG Yan, GUO Chun, KONG De-cheng, ZHAO Zhen-jiang, WANG Li, DONG Chao-fang. Microstructures and corrosion failure analysis of zinc anode[J]. Powder Metallurgy Technology, 2018, 36(5): 348-354. DOI: 10.19591/j.cnki.cn11-1974/tf.2018.05.005

Microstructures and corrosion failure analysis of zinc anode

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  • Corresponding author:

    WANG Yan, E-mail: penny0115@163.com

  • Received Date: February 21, 2018
  • A corrosion product layer in the thickness of about 1 mm was formed on the failed zinc anode surface, and the non-conducting corrosion product was strongly bonded to the substrate, leading to the failure of anode protection. The corrosion products of zinc anode surface showed the obvious layered structure, which was mostly in flake-like and partly in spherical. The sheet products were mainly Zn12(SO4)3Cl3(OH)5·5H2O and Zn4SO4(OH)6·5H2O, and the spherical products were mainly Zn5(OH)8Cl2·H2O; the contents of Pb, Cu, and Fe by mass were slightly exceeded standard in the failed zinc block, resulting in the decrease of zinc protection efficiency. If the sacrificial anode was disturbed by stray current, its surface would be deactivated by rapid polarization; when the sacrificial anode was polarized by the constant current of 0.1 mA·cm-2 for 10 h, the zinc surface would be in polarization passivation state soon, losing the sacrifice protection.
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