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Understanding the corrosion behaviour of laser directed energy deposition-based additive manufacturing built Inconel 718 under acidic environments

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Abstract

This paper presents an investigation on the electrochemical corrosion behaviour of Laser Directed Energy Deposition (LDED)-based additive manufacturing built Inconel 718 (IN718) for the first time in various acidic environments (2 M HNO3, 2 M HCl and 2 M H2SO4). Open circuit potential reveals that corrosion is more active in HCl, and Tafel extrapolation shows that the corrosion rate (CR) is maximum in HCl and minimum in HNO3. Potentiodynamic polarization studies conducted on the samples reveal active–passive behaviour of IN718 and show that pitting potential is maximum in HCl. Cyclic polarization studies reveal localized pitting behaviour in HCl, with no signs of pitting corrosion in HNO3 and H2SO4, which is further confirmed using Scanning Electron Microscopy. The estimated CR for IN718 is lower than the acceptable CR for nickel-based alloys (4 mpy) in all acidic environments under investigation. The study paves the way for potential deployment of LDED built IN718 components under various corrosive environments.

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Acknowledgements

Mr. P. K. Diljith and Mr. A N Jinoop acknowledge the financial support from Ministry of Human Resources Development and Department of Atomic Energy, Government of India, respectively. The authors thank Mr. G K Mishra and Mr. U. Kumar of LAM Lab, RRCAT for their help during the study.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, Karnataka, 575025, India

    P. K. Diljith, P. Krishna & S. Bontha

  2. Laser Technology Division, Raja Ramanna Centre for Advanced Technology, Indore, Madhya Pradesh, 452013, India

    A. N. Jinoop, C. P. Paul & K. S. Bindra

  3. Homi Bhabha National Institute, Anushaktinagar, Mumbai, Maharashtra, 400094, India

    A. N. Jinoop, C. P. Paul & K. S. Bindra

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  1. P. K. Diljith
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Correspondence to C. P. Paul.

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Diljith, P.K., Jinoop, A.N., Paul, C.P. et al. Understanding the corrosion behaviour of laser directed energy deposition-based additive manufacturing built Inconel 718 under acidic environments. Prog Addit Manuf 6, 395–406 (2021). https://doi.org/10.1007/s40964-021-00176-4

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