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<p>Additive manufacturing is a groundbreaking technique to fabricate the structural components in near-net format. However, additive manufacturing frequently involves the introduction of metallurgical defects such as dislocation cells, trapped gas pores, rough surfaces, and even microcracks. In this contribution, we propose to elevate the corrosion resistance of 304L steel fabricated by selective laser melting via corrosion inhibition technology. The synergistic inhibitory impact and mechanism of phytic acid (PA) and trisodium phosphate (TSP) in mitigating the corrosion of SLM 304L steel in 3.5&#xa0;wt% NaCl are analyzed without impairing mechanical performance. The results from the deployed electrochemical impedance spectroscopy and potentiodynamic polarization techniques indicate that either TSP (46.30%) or PA (65.63%) exhibits moderate inhibitive efficiency, whereas the synergistic effect demonstrates the highest inhibitive efficiency (92.35%). Analysis using X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy validate the development of a protective layer on the surface of the synergistic inhibited SLM 304L steel. Chronoamperometry findings in the aggressive electrolyte assessed the inhibitory film’s electrochemical stability, significantly affecting anti-corrosion. A series of metallurgical microscopy, atomic force microscopy, and scanning electron microscopy with energy-dispersive X-ray analysis revealed a smoother morphology and changes in elemental alignment in the presence of blend, indicating a more pronounced inhibitory effect. Upon further examination of the additional benefits presented by the target corrosion inhibitors (phosphate and phytate), including their excellent water solubility and minimal toxicity, one can anticipate a significant potential for application in various additively manufactured steels.</p>

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Synergistic impact of phytic acid and sodium phosphate on the corrosion inhibition of additively manufactured 304L steel in a 3.5 wt% NaCl medium

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Uppalapati Pramod Kumar,
  • Bin Bin He

摘要

Additive manufacturing is a groundbreaking technique to fabricate the structural components in near-net format. However, additive manufacturing frequently involves the introduction of metallurgical defects such as dislocation cells, trapped gas pores, rough surfaces, and even microcracks. In this contribution, we propose to elevate the corrosion resistance of 304L steel fabricated by selective laser melting via corrosion inhibition technology. The synergistic inhibitory impact and mechanism of phytic acid (PA) and trisodium phosphate (TSP) in mitigating the corrosion of SLM 304L steel in 3.5 wt% NaCl are analyzed without impairing mechanical performance. The results from the deployed electrochemical impedance spectroscopy and potentiodynamic polarization techniques indicate that either TSP (46.30%) or PA (65.63%) exhibits moderate inhibitive efficiency, whereas the synergistic effect demonstrates the highest inhibitive efficiency (92.35%). Analysis using X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy validate the development of a protective layer on the surface of the synergistic inhibited SLM 304L steel. Chronoamperometry findings in the aggressive electrolyte assessed the inhibitory film’s electrochemical stability, significantly affecting anti-corrosion. A series of metallurgical microscopy, atomic force microscopy, and scanning electron microscopy with energy-dispersive X-ray analysis revealed a smoother morphology and changes in elemental alignment in the presence of blend, indicating a more pronounced inhibitory effect. Upon further examination of the additional benefits presented by the target corrosion inhibitors (phosphate and phytate), including their excellent water solubility and minimal toxicity, one can anticipate a significant potential for application in various additively manufactured steels.