Issue 10, 2023
From the journal:

RSC Advances

Passivation of precipitation-hardened UNS N07718 in a shallow sour aqueous solution

Jun-Seob Lee, ORCID logo *ab   Ye-Jin Lee,b   Soon il Kwon,c   Jungho Shin,c   Sung Kang,d   Seung-Hoon Baekd  and  Je-Hyun Leeab  

* Corresponding authors

a School of Materials Science and Engineering, Changwon National University, 51140 Changwondaehak-ro, Changwon, South Korea
E-mail: junseoblee@changwon.ac.kr
Fax: +82-55-261-7017
Tel: +82-55-213-3691

b Department of Materials Convergence and System Engineering, Changwon National University, 51140 Changwondaehak-ro, Changwon, South Korea

c R&d Center, SeAH CSS Corporation, Jeokhyun-ro, Changwon, South Korea

d Research Institute of Industry Science & Technology, Cheongam-ro, Pohang, South Korea

Abstract

Passivation of precipitation-hardened UNS N07718 in 5 wt% NaCl + 0.5 wt% CH3COOH was investigated. Cyclic potentiodynamic polarisation revealed that the alloy surface was passivated without active-passive transition behaviour. The alloy surface was in a stable passive state during potentiostatic polarisation at 0.5 VSSE for 12 h. Bode and Mott–Schottky plots showed that the passive film became electrically resistive and less defective with n-type semiconductive properties during the polarisation. X-ray photoelectron spectra revealed that Cr- and Fe-enriched hydro/oxide layers were formed on the outer and inner layers of the passive film, respectively. The thickness of the film was almost constant with the increase of the polarisation time. The outer Cr-hydroxide layer changed into a Cr-oxide layer during the polarisation, resulting in a decreased donor density in the passive film. The film's composition change during the polarisation should be related to the corrosion resistance of the alloy in the shallow sour conditions.

Graphical abstract: Passivation of precipitation-hardened UNS N07718 in a shallow sour aqueous solution

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Article information

DOI
https://doi.org/10.1039/D3RA00833A
Article type
Paper
Submitted
08 Feb 2023
Accepted
18 Feb 2023
First published
01 Mar 2023
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2023,13, 6564-6572

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Passivation of precipitation-hardened UNS N07718 in a shallow sour aqueous solution

J. Lee, Y. Lee, S. I. Kwon, J. Shin, S. Kang, S. Baek and J. Lee, RSC Adv., 2023, 13, 6564 DOI: 10.1039/D3RA00833A

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