EFFECTS OF NITRITE ANIONS ON SURFACE PASSIVE FILM PROPERTIES FOR Q235 CARBON STEELS

Yong Zhou, Huiju Huang, Pei Zhang, Dong Liu and Fuan Yan
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Yong Zhou: Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430205, P. R. China
Huiju Huang: Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430205, P. R. China
Pei Zhang: #x2020;Guangxi Key Laboratory of Agricultural Resources, Chemistry and Biotechnology, Yulin Normal University, Yulin 537000, P. R. China
Dong Liu: Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430205, P. R. China
Fuan Yan: Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430205, P. R. China

Surface Review and Letters (SRL), 2019, vol. 26, issue 07, 1-8

Abstract: In this paper, for Q235 carbon steels in NaNO2 solutions with different concentrations of NO2−, a passive film composed of mainly Fe2O3 was formed on the Q235 surface, and the effects of NO2− concentrations on the properties of passive film were studied by electrochemical methods and microstructural analyses. The applications of electrochemical impedance spectroscopy (EIS), Mott–Schottky (MS) plot, scanning electron microscope (SEM) and X-ray photoelectron spectroscope (XPS) were carried out to characterize the resistance, defect, morphology and composition of passive film, respectively. The passive film resistance and defect, respectively, increased and decreased with the increase of NO2− concentration until the NO2− concentration was up to 0.01M, which was the critical NO2− concentration of stable passivation for the Q235 surface. The relation between the electrochemical behavior and the passive film was also discussed in detail.

Keywords: Carbon steel; nitrite anions; passive film; electrochemistry; SEM; XPS (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X18502189

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