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<p>This study investigates the impact of laser shock peening (LSP) on the corrosion behavior of Wire Arc Additive Manufactured (WAAM) Monel-400 in a 3.5% NaCl environment. Monel-400 (Ni-Cu alloy) was selected for its exceptional corrosion resistance and high strength. The LSP process, applied at pulse energies of 2.5&#xa0;J and 3.5&#xa0;J, improves surface properties by inducing compressive residual stresses, enhancing microstructure, and refining grain boundaries. Electrochemical analysis revealed significant improvements in corrosion resistance after LSP treatment, impedance measurements confirmed enhanced corrosion resistance, with charge transfer resistance increasing from 2.740 kΩ cm<sup>2</sup> (untreated) to 8.200 kΩ cm<sup>2</sup> (LSP 3.5&#xa0;J). Microstructural analysis showed that LSP treatment led to grain refinement, higher dislocation density, and improved surface hardness. Surface roughness was reduced from 10.2&#xa0;µm (untreated) to 2.10&#xa0;µm (LSP 3.5&#xa0;J), and residual compressive stresses contributed to a more stable passive film and reduced corrosion product formation. These results revealed that LSP significantly enhances the corrosion resistance and mechanical properties of WAAM Monel-400, making it suitable for harsh marine environments.</p>

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Influence of Laser Shock Peening on Corrosion Behavior and Surface Integrity of Wire Arc Additive Manufactured Ni-Cu Alloy in Chloride Environments

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Munusamy Sivakumar

摘要

This study investigates the impact of laser shock peening (LSP) on the corrosion behavior of Wire Arc Additive Manufactured (WAAM) Monel-400 in a 3.5% NaCl environment. Monel-400 (Ni-Cu alloy) was selected for its exceptional corrosion resistance and high strength. The LSP process, applied at pulse energies of 2.5 J and 3.5 J, improves surface properties by inducing compressive residual stresses, enhancing microstructure, and refining grain boundaries. Electrochemical analysis revealed significant improvements in corrosion resistance after LSP treatment, impedance measurements confirmed enhanced corrosion resistance, with charge transfer resistance increasing from 2.740 kΩ cm2 (untreated) to 8.200 kΩ cm2 (LSP 3.5 J). Microstructural analysis showed that LSP treatment led to grain refinement, higher dislocation density, and improved surface hardness. Surface roughness was reduced from 10.2 µm (untreated) to 2.10 µm (LSP 3.5 J), and residual compressive stresses contributed to a more stable passive film and reduced corrosion product formation. These results revealed that LSP significantly enhances the corrosion resistance and mechanical properties of WAAM Monel-400, making it suitable for harsh marine environments.