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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (1): 21-26    DOI: 10.11902/1005.4537.2013.241
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Electrochemical Behavior of X80 Pipeline Steel in Simulated Red Soil Solutions with Different pH
LIU Shuyun1, WANG Shuaixing1,2, DU Nan1(), WANG Liqiang3, XIAO Jinhua1
1. National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China
2. Institute of Corrosion and Protection, Northwestern Polytechnical University, Xi'an 710072, China
3. Department of Manufacture Engineering, Chengdu Aircraft Industrial Group Co., Chengdu 610092, China
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Abstract  

The electrochemical behavior of X80 pipeline steel in simulated red soil solutions with different pH, which aim to simulate the corrosive medium of typical red soil at Yingtan area of the Southeast China was studied by potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS) and three-dimensional video microscope. The results show that the corrosion of X80 steel in simulated red soil solution is controlled by oxygen depolarization reactions when pH is 5.5; a corrosion products scale formed on the steel surface due to corrosion; the EIS of the corroded steel is composed of incomplete capacitive arc at high-frequency and complete capacitive arc at low-frequency. With increasing pH value, the corrosion processes of X80 steel gradually convert into being controlled by electrochemical activation, while its corrosion current density increases gradually and its corrosion resistance decreases. When pH value reduces to the range 4.0~3.0, numerous corrosion pits occur on the surface of X80 steel and correspondingly inductive arc appears in the low-frequency region of EIS.
Key words:  X80 pipeline steel      simulated red soil solution      pH      electrochemical impedance spectroscopy (EIS)     
ZTFLH:  TG179  
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Shuyun LIU
Shuaixing WANG
Nan DU
Liqiang WANG
Jinhua XIAO

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LIU Shuyun, WANG Shuaixing, DU Nan, WANG Liqiang, XIAO Jinhua. Electrochemical Behavior of X80 Pipeline Steel in Simulated Red Soil Solutions with Different pH. Journal of Chinese Society for Corrosion and protection, 2015, 35(1): 21-26.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.241     OR     https://www.jcscp.org/EN/Y2015/V35/I1/21

Fig.1  Potentiodynamic polarization curves of X80 steel in simulated red soil solutions with different pH values
pH icorr / (Acm-2) Ecorr / V
5.5 1.367×10-6 -0.3604
5.0 1.691×10-6 -0.4204
4.5 1.868×10-6 -0.4157
4.0 2.928×10-6 -0.4102
3.5 6.700×10-6 -0.5101
3.0 1.130×10-5 -0.6403
Table1  Fitted results of polarization curves for X80 steel in simulated red soil solutions with different pH values
Fig.2  Nyquist plots (a, b) and its equivalent circuits (c, d) for X80 steel in simulated red soil solutions with pH=5.5~4.5 (a, c) and pH=4.0~3.0 (b, d)
pH Rct / Ωcm2 Qdl / Fcm-2 ndl Rf / Ωcm2 Lf / Hcm-2 Qf / Fcm-2 nf R0 / Ωcm2 L0 / Hcm-2
5.5 221.8 8.67×10-5 0.8379 47.14 --- 6.578×10-8 0.8655 --- ---
5.0 145.6 1.813×10-4 0.8058 38.77 --- 3.578×10-7 0.8390 --- ---
4.5 118.4 3.051×10-4 0.7827 30.62 --- 9.026×10-7 0.7927 --- ---
4.0 84.5 7.148×10-4 0.7368 20.57 12.39 4.262×10-4 0.1726 11.84 3.681×10-5
3.5 46.9 3.567×10-4 0.816 11.72 2.8 1.051×10-4 0.0750 3.145 1.077×10-5
3.0 47.48 3.115×10-4 0.8856 17.55 10.21 3.304×10-4 0.0809 3.182 1.052×10-4
Table 2  Fitted results of EIS for X80 steel in simulated red soil solutions with different pH values
Fig.3  Rct curve for X80 steel in simulated red soil solutions with different pH values
Fig.4  Rf and nf curves for X80 steel in simulated red soil solutions with different pH values
Fig.5  Morphologies of X80 steel in simulated red soil solution with pH=5.5 (a), pH=5.0 (b), pH=4.5 (c), pH=4.0 (d), pH=3.5 (e) and pH=3.0 (f) after EIS tests
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