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<p>The present study deals with the impact of laser shock peening (LSP) on the microstructure and corrosion behavior of AA5083 alloy, using optical microscopy, scanning electron microscopy (SEM), weight loss corrosion tests, open circuit potential (OCP), and Tafel polarization tests. LSP improved the microstructure by reducing grain size and uniformizing the distribution of alloying elements. Optical and SEM analyses revealed smoother surfaces and smaller, uniformly distributed precipitates, which improved the passive oxide layer’s stability. Weight loss tests revealed improved corrosion resistance in LSP-treated samples, decreasing weight loss from 0.066&#xa0;mg in the base alloy to 0.043&#xa0;mg after SP. Similarly, OCP measurements revealed a positive shift in corrosion potential from − 822 to − 416&#xa0;mV, indicating improved electrochemical stability. Tafel test results confirmed the superior corrosion resistance of SP-treated samples, resulting in a significant shift in corrosion potential from − 1167&#xa0;mV to − 602&#xa0;mV. LSP produced compressive residual stresses and refined surface morphology, which reduced stress-corrosion cracking and localized corrosion. This comprehensive study identifies LSP as an effective surface treatment for improving the corrosion resistance and microstructural integrity ofAA5083 alloy, making it suitable for use in marine, aerospace, and automotive applications.</p>

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Role of Laser Shock Peening in Refining Microstructure and Mitigating Corrosion in AA5083 Alloy

  • 期刊论文

  • 发表日期：

    2025年1月26日

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  • Chitturi Ram Prasad,
  • Ayinala Naga Sai,
  • Praveen Mathi,
  • V. V. M. J. Satish Chembuly,
  • Rama Bhadri Raju Chekuri,
  • Ravi Varma Penmetsa,
  • Kumar Raja Gudaru

摘要

The present study deals with the impact of laser shock peening (LSP) on the microstructure and corrosion behavior of AA5083 alloy, using optical microscopy, scanning electron microscopy (SEM), weight loss corrosion tests, open circuit potential (OCP), and Tafel polarization tests. LSP improved the microstructure by reducing grain size and uniformizing the distribution of alloying elements. Optical and SEM analyses revealed smoother surfaces and smaller, uniformly distributed precipitates, which improved the passive oxide layer’s stability. Weight loss tests revealed improved corrosion resistance in LSP-treated samples, decreasing weight loss from 0.066 mg in the base alloy to 0.043 mg after SP. Similarly, OCP measurements revealed a positive shift in corrosion potential from − 822 to − 416 mV, indicating improved electrochemical stability. Tafel test results confirmed the superior corrosion resistance of SP-treated samples, resulting in a significant shift in corrosion potential from − 1167 mV to − 602 mV. LSP produced compressive residual stresses and refined surface morphology, which reduced stress-corrosion cracking and localized corrosion. This comprehensive study identifies LSP as an effective surface treatment for improving the corrosion resistance and microstructural integrity ofAA5083 alloy, making it suitable for use in marine, aerospace, and automotive applications.