SURFACE PASSIVE FILM CHARACTERISTIC OF Q235 CARBON STEEL IN PURE MOLYBDATE SOLUTION

Pei Zhang (), Yijiang Chen (), Huiju Huang (), Yong Zhou (), Fuan Yan () and Guochao Nie ()
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Pei Zhang: College of Chemistry and Food Science, Yulin Normal University, Yulin City, Guangxi Province, P. R. China
Yijiang Chen: #x2020;Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan City, Hubei Province, P. R. China
Huiju Huang: #x2020;Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan City, Hubei Province, P. R. China
Yong Zhou: #x2020;Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan City, Hubei Province, P. R. China
Fuan Yan: #x2020;Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan City, Hubei Province, P. R. China
Guochao Nie: #x2021;College of Physics and Telecommunication, Yulin Normal University, Yulin City, Guangxi Province, P. R. China

Surface Review and Letters (SRL), 2020, vol. 27, issue 05, 1-9

Abstract: In pure Na2MoO4 solutions with different concentrations of MoO42− (0.01, 0.04, 0.06, 0.08 and 0.10 mmol/L), a passive film was formed on the surface of Q235 carbon steel spontaneously, and the influences of MoO42− concentrations on the passive film characteristics were investigated. The electrochemical and microstructural techniques of electrochemical impedance spectroscopy (EIS), Mott–Schottky plot (MSP), scanning electron microscope (SEM) and X-ray photoelectron spectroscope (XPS) were applied to characterize the passive film characteristics, including resistance, defect, microstructure and composition. The resistance and defect of passive film respectively increased and decreased with increased MoO42− concentration up to 0.08mmol/L, which was the critical MoO42− concentration of complete passivation for the Q235 surface. The passive film formed in the 0.08mmol/L Na2MoO4 solution showed a dense microstructure and was composed of Fe2(MoO4)3 mainly. Further, in this work, the relation between characteristic and anti-corrosion of passive film was also discussed.

Keywords: Carbon steel; MoO42−; surface passive film; electrochemistry; SEM; XPS (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19501798

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