Corrosion evaluation of superalloys Haynes 282 and Inconel 718 in Hydrochloric acid
No Thumbnail Available
Files
Date
2019
Authors
Osoba, L.O.
Oladoye, A.M.
Ogbonna, V.E.
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Alloys and Compounds
Abstract
Corrosion susceptibility of Haynes 282 (HY282) and Inconel 718 (IN718) superalloys in hydrochloric acid
(HCl) at ambient temperature was investigated using gravimetric and electrochemical techniques. In the
gravimetric study, corrosion rate of the superalloys in 0.5 M, 0.75 M, and 1 M HCl for 72 days was
evaluated using weight loss method. The concentration of metallic ions in the 1 M electrolyte after the
immersion test was estimated using Atomic Absorption Spectroscopy and surface morphologies of the
corroded superalloys was characterized using Optical microscopy and SEM/EDX. Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and Mott-Schottky test were deployed to
investigate the electrochemical properties of the passive film formed on both alloys in 1 M HCl. The
results showed that HY282 exhibited a higher resistance to dissolution than IN718 in HCl owing to the
presence of a more compact passive film with apparently less defect. This observation is explained in this
communication based on compositional chemistry difference in both alloys
Description
Keywords
Nickel-based superalloys Hydrochloric acid Corrosion Passive film
Citation
Osoba, L.O. Oladoye, A.M. Ogbonna, V.E. (2019). Corrosion evaluation of superalloys Haynes 282 and Inconel 718 in Hydrochloric acid. Journal of Alloys and Compounds; 804: 376-384.