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Journal of Chinese Society for Corrosion and protection  2017, Vol. 37 Issue (2): 162-167    DOI: 10.11902/1005.4537.2015.231
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Electrochemical Behavior of 316L Stainless Steel in Borate Buffer Solution with Different pH
Yanliang WANG,Xu CHEN(),Jidong WANG,Bo SONG,Dongsheng FAN,Chuan HE
School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China
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Abstract  

The electrochemical characteristics of the passivation film formed on 316L stainless steel in borate buffer solutions with pH of 4, 7 and 11, respectively were characterized by means of potentiodynamic polarization, electrochemical impedance spectroscopy and Mott-Schottky technology. The composition of passive film was analysized by X-ray photoelectron spectroscopy (XPS). The results showed that the stable passivation film could form on the steel surface in all the three borate buffer solutions. The passivation potential range decreased and the transpassive potential dropped significantly with the increasing pH value. The transpassive current of 316L stainless steel in alkaline borate buffer solution increased significantly. The integrity of the passive film was the best in the neutral solution, while it was the worst in the acid solution. The Mott-Schottky results showed that the semiconductor type of the passive film transferred from n-type to p-type with the increasing potential in acid solution. It was n-type and p-type semiconductor in the neutral and alkaline solution, respectively. It was attributed to that the chromium hydroxide dropped down and the formed iron compound was transformed from FeO(OH) to Fe3O4. The content of Cr2O3 was decreased in alkaline solution, which resulted in lower corrosion resistance.
Key words:  316L stainless steel      pH      passivation film      electrochemical behavior      XPS     
Received:  23 December 2015     
Fund: Supported by National Natural Science Foundation of China (51201009) and Natural Science Foundation of Liaoning Province (2013020078)
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Yanliang WANG
Xu CHEN
Jidong WANG
Bo SONG
Dongsheng FAN
Chuan HE

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Yanliang WANG,Xu CHEN,Jidong WANG,Bo SONG,Dongsheng FAN,Chuan HE. Electrochemical Behavior of 316L Stainless Steel in Borate Buffer Solution with Different pH. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 162-167.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.231     OR     https://www.jcscp.org/EN/Y2017/V37/I2/162

Fig.1  Potentiodynamic polarization curves of 316L stainless steel in the solutions with different pH values
pH Ecorr V Passive potential range V IpμAcm-2
4 -0.527 -0.318~1.14 0.295
7 -0.220 0.096~0.959 0.323
11 -0.378 -0.03~0.703 0.426
Table 1  Fitting results of polarization curves
Fig.2  Nyquist (a) and Bode (b) polts of 316L stainless steel in the solutions with different pH values
Fig.3  Equivalent circuit of EIS
pH Rs / Ωcm2 Q1 / Fcm-2 n1 R1 / Ωcm2 Q2 / Fcm-2 n2 R2 / Ωcm2
4 0.34 1.07×10-4 0.887 1.73×10-5 4.25×10-10 1.00 1156
7 0.01 3.29×10-10 1.000 1446 7.50×10-5 0.82 2.29×105
11 189 7.60×10-5 0.999 16.47 5.48×10-5 0.89 1.38×105
Table 2  Fitting results of EIS
Fig.4  Mott-Schottky plots of passive films of 316L stainless steel in the solutions with pH=4 (a), pH=7 (b) and pH=11 (c)
Fig.5  Detailed XPS spectra of Fe (a, c, e) and Cr (b, d, f) of passive films formed on 316L stainless steel in the solutions with pH=4 (a, b), pH=7 (c, d) and pH=11 (e, f)
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