Evaluation of the Corrosion Behavior of Inconel 718 Alloy Processed by SLM Additive Manufacturing Method After 5000 h of Immersion in Natural Seawater
The corrosion behavior of Inconel 718 alloy, developed through two different methods—forging (S1) and additive manufacturing (S2)—was evaluated in a seawater environment, and the results were compared with those of Inconel 825 alloy (S3). The corrosion performance of the alloys was examined accordin...
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2025-06-01
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| author | Elena Ionela Neacsu Cristina Donath Loredana Preda Mihai Anastasescu Alexandra Banu Alexandru Paraschiv Adrian Bibis Maria Marcu |
| author_facet | Elena Ionela Neacsu Cristina Donath Loredana Preda Mihai Anastasescu Alexandra Banu Alexandru Paraschiv Adrian Bibis Maria Marcu |
| author_sort | Elena Ionela Neacsu |
| collection | DOAJ |
| description | The corrosion behavior of Inconel 718 alloy, developed through two different methods—forging (S1) and additive manufacturing (S2)—was evaluated in a seawater environment, and the results were compared with those of Inconel 825 alloy (S3). The corrosion performance of the alloys was examined according to ISO 8044/2024, using open circuit potential (OCP), potentiodynamic polarization (PP), and electrochemical impedance spectroscopy (EIS), in natural seawater at 25 °C over an extended immersion period. After 5000 h of immersion, the corrosion rate (<i>R<sub>corr</sub></i>) estimated from anodic polarization tests was found to be lower for the wrought Inconel 718 alloy (1.21 µm y<sup>−1</sup>) compared to the wrought 825 alloy (4.1 µm y<sup>−1</sup>) and to the SLM Inconel 718 alloy (35.1 µm y<sup>−1</sup>), indicating high corrosion resistance for wrought Inconel 718. A morphological analysis of the alloy’s surface conducted using scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS) revealed a continuous, compact film with localized salt deposits on wrought Inconel 718 and Incoloy 825. In contrast, SLM Inconel 718 exhibited a porous, inhomogeneous film, leading to reduced protective capabilities and lower corrosion resistance. The results demonstrate that wrought Inconel 718 exhibits excellent corrosion resistance in seawater, making it a promising alloy for marine applications. |
| format | Article |
| id | doaj-art-bfded34d88314e57ad66e8df4539e260 |
| institution | DOAJ |
| issn | 2075-4701 |
| language | English |
| publishDate | 2025-06-01 |
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| spelling | doaj-art-bfded34d88314e57ad66e8df4539e2602025-08-20T03:08:13ZengMDPI AGMetals2075-47012025-06-0115771310.3390/met15070713Evaluation of the Corrosion Behavior of Inconel 718 Alloy Processed by SLM Additive Manufacturing Method After 5000 h of Immersion in Natural SeawaterElena Ionela Neacsu0Cristina Donath1Loredana Preda2Mihai Anastasescu3Alexandra Banu4Alexandru Paraschiv5Adrian Bibis6Maria Marcu7Institute of Physical Chemistry-Ilie Murgulescu, Splaiul Independentei 202, 060021 Bucharest, RomaniaInstitute of Physical Chemistry-Ilie Murgulescu, Splaiul Independentei 202, 060021 Bucharest, RomaniaInstitute of Physical Chemistry-Ilie Murgulescu, Splaiul Independentei 202, 060021 Bucharest, RomaniaInstitute of Physical Chemistry-Ilie Murgulescu, Splaiul Independentei 202, 060021 Bucharest, RomaniaSurface Engineering and Corrosion Laboratory, Faculty of Industrial Engineering and Robotics, National University of Science and Technology Politehnica Bucharest, Splaiul Independentei 313, 060042 Bucharest, RomaniaRomanian Research and Development Institute for Gas Turbines COMOTI, Iuliu Maniu 220D, 061126 Bucharest, RomaniaRomanian Research and Development Institute for Gas Turbines COMOTI, Iuliu Maniu 220D, 061126 Bucharest, RomaniaInstitute of Physical Chemistry-Ilie Murgulescu, Splaiul Independentei 202, 060021 Bucharest, RomaniaThe corrosion behavior of Inconel 718 alloy, developed through two different methods—forging (S1) and additive manufacturing (S2)—was evaluated in a seawater environment, and the results were compared with those of Inconel 825 alloy (S3). The corrosion performance of the alloys was examined according to ISO 8044/2024, using open circuit potential (OCP), potentiodynamic polarization (PP), and electrochemical impedance spectroscopy (EIS), in natural seawater at 25 °C over an extended immersion period. After 5000 h of immersion, the corrosion rate (<i>R<sub>corr</sub></i>) estimated from anodic polarization tests was found to be lower for the wrought Inconel 718 alloy (1.21 µm y<sup>−1</sup>) compared to the wrought 825 alloy (4.1 µm y<sup>−1</sup>) and to the SLM Inconel 718 alloy (35.1 µm y<sup>−1</sup>), indicating high corrosion resistance for wrought Inconel 718. A morphological analysis of the alloy’s surface conducted using scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS) revealed a continuous, compact film with localized salt deposits on wrought Inconel 718 and Incoloy 825. In contrast, SLM Inconel 718 exhibited a porous, inhomogeneous film, leading to reduced protective capabilities and lower corrosion resistance. The results demonstrate that wrought Inconel 718 exhibits excellent corrosion resistance in seawater, making it a promising alloy for marine applications.https://www.mdpi.com/2075-4701/15/7/713corrosion-resistant materialsnickel-based alloysadditive manufacturingseawater |
| spellingShingle | Elena Ionela Neacsu Cristina Donath Loredana Preda Mihai Anastasescu Alexandra Banu Alexandru Paraschiv Adrian Bibis Maria Marcu Evaluation of the Corrosion Behavior of Inconel 718 Alloy Processed by SLM Additive Manufacturing Method After 5000 h of Immersion in Natural Seawater Metals corrosion-resistant materials nickel-based alloys additive manufacturing seawater |
| title | Evaluation of the Corrosion Behavior of Inconel 718 Alloy Processed by SLM Additive Manufacturing Method After 5000 h of Immersion in Natural Seawater |
| title_full | Evaluation of the Corrosion Behavior of Inconel 718 Alloy Processed by SLM Additive Manufacturing Method After 5000 h of Immersion in Natural Seawater |
| title_fullStr | Evaluation of the Corrosion Behavior of Inconel 718 Alloy Processed by SLM Additive Manufacturing Method After 5000 h of Immersion in Natural Seawater |
| title_full_unstemmed | Evaluation of the Corrosion Behavior of Inconel 718 Alloy Processed by SLM Additive Manufacturing Method After 5000 h of Immersion in Natural Seawater |
| title_short | Evaluation of the Corrosion Behavior of Inconel 718 Alloy Processed by SLM Additive Manufacturing Method After 5000 h of Immersion in Natural Seawater |
| title_sort | evaluation of the corrosion behavior of inconel 718 alloy processed by slm additive manufacturing method after 5000 h of immersion in natural seawater |
| topic | corrosion-resistant materials nickel-based alloys additive manufacturing seawater |
| url | https://www.mdpi.com/2075-4701/15/7/713 |
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