Effect of Potential on Electrochemical Corrosion Behavior of 316L Stainless Steel in Borate Buffer Solution

doi:10.11902/1005.4537.2014.031

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (2): 137-143 DOI: 10.11902/1005.4537.2014.031

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Effect of Potential on Electrochemical Corrosion Behavior of 316L Stainless Steel in Borate Buffer Solution

CHEN Yu, CHEN Xu(

), LIU Tong, WANG Guanfu, WANG Yanliang

College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

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Abstract

The electrochemical corrosion behavior of passive film of 316L stainless steel in borate buffer solution was investigated by dynamic polarization and electrochemical impedance spectroscopy (EIS) technology. The semiconducting character of the passive film was studied by Mott-Schottky curve. The results showed that a much compact and stable passive film could form on 316L stainless steel surface by potentials in a range from -0.1 to 0.5 V; the applied potential had little effect on the semiconducting character of the formed passive film. The passive films formed by potentials in the above range exhibited character of p-type semiconductor and among them the one formed by 0.3 V had the lowest acceptor density N_A.

Key words: 316L stainless steel film forming potential dynamic polarization EIS Mott-Schottky

Received: 22 April 2014

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Cite this article:

CHEN Yu, CHEN Xu, LIU Tong, WANG Guanfu, WANG Yanliang. Effect of Potential on Electrochemical Corrosion Behavior of 316L Stainless Steel in Borate Buffer Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 137-143.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.031 OR https://www.jcscp.org/EN/Y2015/V35/I2/137

Fig.1 Microstructures of 316L stainless steel (a) and the magnified image (b)

Fig.2 Potentiodynamic polarization curve of 316L stainless steel in borate buffer solution

Fig.3 Polarization curves of 316L stainless steel in borate buffer solution at different passive film forming potentials

Fig.4 Nyquist plots of 316L stainless steel in borate buffer solution

Fig.5 Bode plots of 316L stainless steel in borate buffer solution

Fig.6 Equivalent circuit of Nyquist plot

Table 1 Fitting results of Nyquist plots

Fig.7 Mott-Schottky plots of passive films of 316L stainless steel at the passive film forming potential of -0.1 V (a), 0.1 V (b), 0.3 V (c) and 0.5 V (d)

Fig.8 Relationships between N_D, E_fb and forming potential

Fig.9 Thickness of space-charge layer as the function of forming potential

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