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Erschienen in: Progress in Additive Manufacturing 3/2021

15.04.2021 | Full Research Article

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

verfasst von: P. K. Diljith, A. N. Jinoop, C. P. Paul, P. Krishna, S. Bontha, K. S. Bindra

Erschienen in: Progress in Additive Manufacturing | Ausgabe 3/2021

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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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Metadaten
Titel
Understanding the corrosion behaviour of laser directed energy deposition-based additive manufacturing built Inconel 718 under acidic environments
verfasst von
P. K. Diljith
A. N. Jinoop
C. P. Paul
P. Krishna
S. Bontha
K. S. Bindra
Publikationsdatum
15.04.2021
Verlag
Springer International Publishing
Erschienen in
Progress in Additive Manufacturing / Ausgabe 3/2021
Print ISSN: 2363-9512
Elektronische ISSN: 2363-9520
DOI
https://doi.org/10.1007/s40964-021-00176-4

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