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<p>Corrosion and mechanical degradation represent significant threats to materials that are found in highly stressing conditions like in the aerospace, marine, and chemical processing industries. While stainless steel or SS316L has typically developed alloys with excellent corrosion properties, at extreme conditions, this calls for improvements in material compositions. In this work, research analyze two advanced functionally graded materials; these comprises “60% SS316L + 20% Inconel 625 + 20% Ti6Al4V and 60% SS316L + 20% Inconel 625 + 20% Inconel 718”, for their corrosion resistance as well as mechanical qualities when exposed under corrosive circumstances versus pure SS316L. The corrosion resistance of 3P FGMs was evaluated using salt spray tests in 5% NaCl solution at 35&#xa0;°C for 100&#xa0;h and 200&#xa0;h. But among all samples, the FGM sample used in our research revealed least weight loss and absence of deleterious surface change after 200&#xa0;h showing the highest corrosion resistance. Indeed, it was observed that the free standing “60% SS316L + 20% Inconel 625 + 20% Ti6Al4V” FGM specimen of the present study maintained only moderate corrosion resistance under the same exposure time, reflecting slight surface transformations, but not as severely as was the case with pure SS316L steel. Although such alloys are known for their outstanding high-performance capabilities, the concept of functionally graded forms combined with SS316L with a focus on enhanced durability has not been formally mentioned. Salt spray corrosion testing has been conducted for 100 to 200&#xa0;h in a 5% NaCl solution at 35&#xa0;°C. Mechanical properties, including tensile strength, hardness, and structural integrity, are tested after exposure to corrosive environments. The surface modification was evaluated through microstructural analyses. From the results, it was evident that FGMs are superior to base SS316L both in corrosion resistance as well as mechanical stability. Incorporation of Inconel alloys and Ti6Al4V in SS316L significantly improves its corrosion resistance and also the mechanical properties, and thus makes these FGMs highly ideal for high-stress and corrosive environment.</p>

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Investigation of corrosion resistance behavior of additive manufactured SS316L, Inconel 625, Inconel 718 and Ti6Al4V three-phase functionally graded material based on accelerated weight loss corrosion test using 5% NaCl solution

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  • 出版模式：

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  • 发表日期：

    2025年3月31日

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  • K. Sainath,
  • R. Karuppasamy,
  • S. Prabagaran

摘要

Corrosion and mechanical degradation represent significant threats to materials that are found in highly stressing conditions like in the aerospace, marine, and chemical processing industries. While stainless steel or SS316L has typically developed alloys with excellent corrosion properties, at extreme conditions, this calls for improvements in material compositions. In this work, research analyze two advanced functionally graded materials; these comprises “60% SS316L + 20% Inconel 625 + 20% Ti6Al4V and 60% SS316L + 20% Inconel 625 + 20% Inconel 718”, for their corrosion resistance as well as mechanical qualities when exposed under corrosive circumstances versus pure SS316L. The corrosion resistance of 3P FGMs was evaluated using salt spray tests in 5% NaCl solution at 35 °C for 100 h and 200 h. But among all samples, the FGM sample used in our research revealed least weight loss and absence of deleterious surface change after 200 h showing the highest corrosion resistance. Indeed, it was observed that the free standing “60% SS316L + 20% Inconel 625 + 20% Ti6Al4V” FGM specimen of the present study maintained only moderate corrosion resistance under the same exposure time, reflecting slight surface transformations, but not as severely as was the case with pure SS316L steel. Although such alloys are known for their outstanding high-performance capabilities, the concept of functionally graded forms combined with SS316L with a focus on enhanced durability has not been formally mentioned. Salt spray corrosion testing has been conducted for 100 to 200 h in a 5% NaCl solution at 35 °C. Mechanical properties, including tensile strength, hardness, and structural integrity, are tested after exposure to corrosive environments. The surface modification was evaluated through microstructural analyses. From the results, it was evident that FGMs are superior to base SS316L both in corrosion resistance as well as mechanical stability. Incorporation of Inconel alloys and Ti6Al4V in SS316L significantly improves its corrosion resistance and also the mechanical properties, and thus makes these FGMs highly ideal for high-stress and corrosive environment.