期刊
APPLIED SURFACE SCIENCE
卷 369, 期 -, 页码 320-325出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2016.02.088
关键词
Niobium coating; Acid corrosion; Electrochemical measurement; High energy micro arc alloying
类别
资金
- National Natural Scientific Foundation of China [51101023, 51271039]
- Changzhou Science and Technology Program [CZ20130010, CF20140004]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
The niobium coating is fabricated on the surface of AISI Type 304 stainless steel (304SS) by using a high energy micro arc alloying technique in order to improvecorrosion resistance of the steel against acidic environments. The electrochemical corrosion resistance of the niobium coating in 0.7 M sulfuric acid solutions is evaluated by electrochemical impedance spectroscopy, potentiodynamic polarization and the open circuit potential versus time. Electrochemical measurements indicate that the niobium coating increases the free corrosion potential of the substrate by 110 mV and a reduction in the corrosion rate by two orders of magnitude compared to the substrate alone. The niobium coating maintains large impedance and effectively offers good protection for the substrate during the long-term exposure tests, which is mainly ascribed to the niobium coating acting inhibiting permeation of corrosive species. Finally, the corresponding electrochemical impedance models are proposed to elucidate the corrosion resistance behavior of the niobium coating in acid solutions. (C) 2016 Elsevier B.V. All rights reserved.
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