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<p>The differences in corrosion behavior of EW75 Mg alloy treated at different aging temperatures were investigated using surface analysis, scanning Kelvin probe microscopy (SKPM), and electrochemical tests. The results show that as the aging temperature increases from 260&#xa0;°C to 350&#xa0;°C, the second phases in the EW75 alloy transform from a dispersed distribution to a tight arrangement, and then the second phases coarsen with decrease of tightness degree. The dense product films are formed on T6 alloy during micro-galvanic corrosion process, resulting in uniform corrosion instead of pitting corrosion. The corrosion resistance of the T6 EW75 Mg alloy is greatly associated with the continuity and tightness of the second phases. Among the five aging EW75 alloys, the T6-310&#xa0;°C alloy exhibits the best corrosion resistance due to the most tightly arranged second phases and densest product film.</p>

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The corrosion evolution of EW75 Mg alloys at different aging temperatures

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Xiaozhen Liu,
  • Fuchun Chang,
  • Yingwei Song,
  • Kaihui Dong,
  • Yong Cai,
  • Yufei Sun,
  • Ting Li,
  • En-Hou Han

摘要

The differences in corrosion behavior of EW75 Mg alloy treated at different aging temperatures were investigated using surface analysis, scanning Kelvin probe microscopy (SKPM), and electrochemical tests. The results show that as the aging temperature increases from 260 °C to 350 °C, the second phases in the EW75 alloy transform from a dispersed distribution to a tight arrangement, and then the second phases coarsen with decrease of tightness degree. The dense product films are formed on T6 alloy during micro-galvanic corrosion process, resulting in uniform corrosion instead of pitting corrosion. The corrosion resistance of the T6 EW75 Mg alloy is greatly associated with the continuity and tightness of the second phases. Among the five aging EW75 alloys, the T6-310 °C alloy exhibits the best corrosion resistance due to the most tightly arranged second phases and densest product film.