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

Autor: Lee JS; School of Materials Science and Engineering, Changwon National University 51140 Changwondaehak-ro Changwon 51140 South Korea junseoblee@changwon.ac.kr +82-55-261-7017 +82-55-213-3691.; Department of Materials Convergence and System Engineering, Changwon National University 51140 Changwondaehak-ro Changwon 51140 South Korea., Lee YJ; Department of Materials Convergence and System Engineering, Changwon National University 51140 Changwondaehak-ro Changwon 51140 South Korea., Kwon SI; R&d Center, SeAH CSS Corporation Jeokhyun-ro Changwon 51708 South Korea., Shin J; R&d Center, SeAH CSS Corporation Jeokhyun-ro Changwon 51708 South Korea., Kang S; Research Institute of Industry Science & Technology Cheongam-ro Pohang 37673 South Korea., Baek SH; Research Institute of Industry Science & Technology Cheongam-ro Pohang 37673 South Korea., Lee JH; School of Materials Science and Engineering, Changwon National University 51140 Changwondaehak-ro Changwon 51140 South Korea junseoblee@changwon.ac.kr +82-55-261-7017 +82-55-213-3691.; Department of Materials Convergence and System Engineering, Changwon National University 51140 Changwondaehak-ro Changwon 51140 South Korea.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2023 Mar 01; Vol. 13 (10), pp. 6564-6572. Date of Electronic Publication: 2023 Mar 01 (Print Publication: 2023).
DOI: 10.1039/d3ra00833a
Abstrakt: Passivation of precipitation-hardened UNS N07718 in 5 wt% NaCl + 0.5 wt% CH 3 COOH 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 V SSE 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.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
Externí odkaz: