

FOLLOWUS
1.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
2.CRRC Changchun Railway Vehicles Co., Ltd., Changchun 130062, China
Jinghong YANG, yangjinghong.ck@crrcgc.cc
Haibo XU, xuwangri@163.com
Received:04 June 2021,
Accepted:23 July 2021,
Online First:25 August 2021,
Published:2022-07
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Yonghong LU, Xiao LIU, Lisha WANG, et al. Dry passivation of austenitic SUS 301L stainless steel against pitting corrosion in marine atmospheric environment[J]. Journal of Oceanology and Limnology, 2022, 40(4): 1437-1447.
Yonghong LU, Xiao LIU, Lisha WANG, et al. Dry passivation of austenitic SUS 301L stainless steel against pitting corrosion in marine atmospheric environment[J]. Journal of Oceanology and Limnology, 2022, 40(4): 1437-1447. DOI: 10.1007/s00343-021-1168-9.
Being an exclusive construction material for lightweight rail vehicles
protection from pitting corrosion in harsh marine atmospheric environment in high humidity and Cl– ion concentration is critical for austenitic SUS 301L stainless steel (SS)
especially when it inevitably suffers from mechanical damages during post disposals. Herein
an innovative dry passivation method for austenitic SUS 301L SS was established in a closed air atmosphere at low temperature and constant pressure. The process parameters were optimized
and the passivation mechanism was explained using polarization curve
electrochemical impedance spectroscopy (EIS)
X-ray photoelectron spectroscopy (XPS)
and contact angle measurement. The pitting corrosion susceptibility of the passive film prepared in a closed air chamber under 1.0×10
5
Pa at 80 ℃ for 80 min was evaluated in 3.5% NaCl solution and exhibited higher pitting potential and corrosion resistance
lower passivity-maintaining current density
and wettability when compared with conventional nitric acid treatment. Besides
dry passivation facilitated the repairing of the surface structural defect itself and the post-processing damage
similar to the accelerated aging of film. The decrease in oxygen concentration and convection-diffusion strengthened the preferential chromium oxidation to form a compact chromium-rich passive film to resist the aggression of Cl
–
ion.
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