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<p>This study examines the impact of Nickel-Phosphorus (NiP) coatings on 17-4PH stainless steel manufactured by fused filament fabrication (FFF) additive manufacturing, analyzing the impacts of heat treatments at 400 and 600&#xa0;°C with wrought 17-4PH. The research thoroughly investigated the microstructural, mechanical, and corrosion features of an autocatalytic coating process with mechanical agitation using microhardness tests, x-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical analysis. Significant findings indicated improved coating crystallinity with a predominant Ni<sub>3</sub>P phase at high temperatures, conforming to VDI 3198 adhesion criteria, and demonstrating a slight 2% improvement in microhardness following 600&#xa0;°C heat treatment. Electrochemical impedance spectroscopy revealed a 10% enhancement in corrosion resistance, although erosion tests underscored the coating's brittle properties at 30° and 90°. By showing the potential of cutting-edge surface modification techniques for engineered materials, the study offers insightful information about the performance of NiP coatings on additively manufactured 17-4PH stainless steel, with promising applications in the biomedical implants, aerospace, chemical processing, and food processing industries.</p>

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Interfacial Behavior of NiP Coatings on Fused Filament-Fabricated 17-4PH: Insights into Corrosion and Erosion

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • G. Prabu ram,
  • K. Lingadurai

摘要

This study examines the impact of Nickel-Phosphorus (NiP) coatings on 17-4PH stainless steel manufactured by fused filament fabrication (FFF) additive manufacturing, analyzing the impacts of heat treatments at 400 and 600 °C with wrought 17-4PH. The research thoroughly investigated the microstructural, mechanical, and corrosion features of an autocatalytic coating process with mechanical agitation using microhardness tests, x-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical analysis. Significant findings indicated improved coating crystallinity with a predominant Ni3P phase at high temperatures, conforming to VDI 3198 adhesion criteria, and demonstrating a slight 2% improvement in microhardness following 600 °C heat treatment. Electrochemical impedance spectroscopy revealed a 10% enhancement in corrosion resistance, although erosion tests underscored the coating's brittle properties at 30° and 90°. By showing the potential of cutting-edge surface modification techniques for engineered materials, the study offers insightful information about the performance of NiP coatings on additively manufactured 17-4PH stainless steel, with promising applications in the biomedical implants, aerospace, chemical processing, and food processing industries.