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This study characterizes the wear of spark plug electrodes in 1570 kg SUVs using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Two engine models (1.4 and 2.0 T) were analyzed to compare electrode degradation after 60,000 km of service. Additionally, electrodes from 1570 and 1940 kg SUVs (both 2.0 T) were evaluated to assess weight-related wear. New electrodes were characterized as a baseline for comparison, focusing on iridium (Ir), platinum (Pt), and copper (Cu) compositions. Results show that Ir-Pt electrodes exhibit high oxidation resistance and stability under extreme conditions, with minimal variation in Ir/Pt content despite increased Pt-Ca deposits in heavier vehicles. In contrast, Cu electrodes accumulated carbon and oil residues after 60,000 km, indicating significant wear and potential performance decline. The findings highlight the durability of Ir-Pt electrodes under varying loads and emphasize the need for material-specific wear assessments to maintain engine efficiency.

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Comparative Study of the Wear of Spark Plugs with Different Electrode Compositions in Average-Use Turbocharged Four-Stroke Gasoline Engines

  • 章节

  • 发表日期：

    2026年

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  • Aczayacatlh González-Mendoza,
  • José Roberto Contreras-Bárbara,
  • Gilgamesh Luis Raya,
  • Diego A. Fabila-Bustos,
  • Macaria Hernández-Chávez

摘要

This study characterizes the wear of spark plug electrodes in 1570 kg SUVs using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Two engine models (1.4 and 2.0 T) were analyzed to compare electrode degradation after 60,000 km of service. Additionally, electrodes from 1570 and 1940 kg SUVs (both 2.0 T) were evaluated to assess weight-related wear. New electrodes were characterized as a baseline for comparison, focusing on iridium (Ir), platinum (Pt), and copper (Cu) compositions. Results show that Ir-Pt electrodes exhibit high oxidation resistance and stability under extreme conditions, with minimal variation in Ir/Pt content despite increased Pt-Ca deposits in heavier vehicles. In contrast, Cu electrodes accumulated carbon and oil residues after 60,000 km, indicating significant wear and potential performance decline. The findings highlight the durability of Ir-Pt electrodes under varying loads and emphasize the need for material-specific wear assessments to maintain engine efficiency.