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<p>The effects of aging treatment on the long-term salt spray corrosion resistance of 15-5PH stainless steel were studied using white light interferometer, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and electrochemical workstation. The results showed that after 2000 hours of salt spray exposure, the sample aged at 498&#xa0;°C for 1&#xa0;hour had the greatest weight loss, with the pit depth reaching 31.6&#xa0;<i>μ</i>m. In contrast, the pit depth of the sample aged at 580&#xa0;°C for 8 hours was only 18.1&#xa0;<i>μ</i>m. Electrochemical tests indicated that the <i>R</i><sub>p</sub> of the sample aged at 580&#xa0;°C for 8 hours was the highest (1.827 × 10<sup>6</sup> Ω&#xa0;cm<sup>2</sup>), and the pitting potential was positive (159&#xa0;mVSCE), suggesting that the sample had good pitting resistance. TEM analysis showed that the dislocation density of the sample aged at 498&#xa0;°C for 1 hour was the highest (1.16 × 10<sup>17</sup> m<sup>−2</sup>). High-density dislocations created more potential pitting areas in the matrix, reducing its pitting corrosion resistance. Conversely, the matrix of the sample aged at 580&#xa0;°C for 8 hours contained reversed austenite, enhancing its pitting corrosion resistance.</p>

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Effect of Aging Treatment on Long-Term Salt Spray Corrosion Resistance of 15-5PH Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • Chunlei Weng,
  • Junrong Tang,
  • Weichen Yu,
  • Zhenghua Tang,
  • Rui Qin

摘要

The effects of aging treatment on the long-term salt spray corrosion resistance of 15-5PH stainless steel were studied using white light interferometer, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and electrochemical workstation. The results showed that after 2000 hours of salt spray exposure, the sample aged at 498 °C for 1 hour had the greatest weight loss, with the pit depth reaching 31.6 μm. In contrast, the pit depth of the sample aged at 580 °C for 8 hours was only 18.1 μm. Electrochemical tests indicated that the Rp of the sample aged at 580 °C for 8 hours was the highest (1.827 × 106 Ω cm2), and the pitting potential was positive (159 mVSCE), suggesting that the sample had good pitting resistance. TEM analysis showed that the dislocation density of the sample aged at 498 °C for 1 hour was the highest (1.16 × 1017 m−2). High-density dislocations created more potential pitting areas in the matrix, reducing its pitting corrosion resistance. Conversely, the matrix of the sample aged at 580 °C for 8 hours contained reversed austenite, enhancing its pitting corrosion resistance.