<p>To date, the surface microstructure of lead anodes has been recognized as a critical factor influencing their electrochemical and mechanical properties during the zinc electrowinning process. Comparative experiments were conducted on industrial Pb-Ag and Pb-Ag-Ca anodes, with and without sandblasting, using 60-mesh SiC sand and 60-mesh Al<sub>2</sub>O<sub>3</sub> sand. The corresponding mechanical and electrochemical properties were systematically investigated and analyzed. The results demonstrate that sandblasting significantly improves the mechanical properties of the alloy surface, with tensile strength increasing by 2.84 to 11.66%. In addition, the surface of the sandblasted lead anode is uniformly distributed with SiC and Al<sub>2</sub>O<sub>3</sub> particles, which enhances its initial corrosion resistance, increases surface roughness, promotes the formation of lead oxide, and facilitates the oxygen evolution reaction during practical applications. However, the uneven distribution of lead oxide on the anode surface reduces the corrosion resistance of the sandblasted anodes once the film layer begins to corrode. This leads to further increases in surface roughness and accelerates the corrosion process.</p>

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Surface treatment improving the mechanism and electrochemical properties of lead anodes by sandblasting

  • Yiwen Chen,
  • Yi Tao,
  • Buming Chen,
  • Jun Guo,
  • Ruidong Xu,
  • Zhongcheng Guo

摘要

To date, the surface microstructure of lead anodes has been recognized as a critical factor influencing their electrochemical and mechanical properties during the zinc electrowinning process. Comparative experiments were conducted on industrial Pb-Ag and Pb-Ag-Ca anodes, with and without sandblasting, using 60-mesh SiC sand and 60-mesh Al2O3 sand. The corresponding mechanical and electrochemical properties were systematically investigated and analyzed. The results demonstrate that sandblasting significantly improves the mechanical properties of the alloy surface, with tensile strength increasing by 2.84 to 11.66%. In addition, the surface of the sandblasted lead anode is uniformly distributed with SiC and Al2O3 particles, which enhances its initial corrosion resistance, increases surface roughness, promotes the formation of lead oxide, and facilitates the oxygen evolution reaction during practical applications. However, the uneven distribution of lead oxide on the anode surface reduces the corrosion resistance of the sandblasted anodes once the film layer begins to corrode. This leads to further increases in surface roughness and accelerates the corrosion process.