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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (1): 27-32    DOI: 10.11902/1005.4537.2013.251
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Corrosion Behavior of Galvanized Q235 Steel for Grounding in Acid Soils
ZHENG Mincong1, LI Jianhua1, NIE Xinhui1, LI Bowen2(), TAI Chuang2
1. State Grid Anhui Electric Power Research Institute, Hefei 230601, China
2. Environmental Corrosion Research Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Abstract  

Electrochemical behavior of galvanized Q235 steel for grounding in acidified soils with different pH value was investigated utilizing electrochemical impedance spectrum (EIS) and potentiodynamic polarization tests. Results showed that the corrosion behavior of galvanized Q235 steel in acid soils presents an adsorption of intermediate corrosion products in the early stage, and a low frequency inductive loop then induced in Nyquist plot. With the formation of corrosion products on the surface of the steel, the inductive loop disappeared, the low frequency capacitive arc enlarged gradually. The corrosion process is mainly controlled by the cathodic process. The corrosion rate of the galvanized Q235 steel decreased with the increasing pH of the acidified solution, it also increased and then decreased with the increasing time.
Key words:  galvanized steel      acidic soil      corrosion      EIS     
ZTFLH:  TG174  
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Mincong ZHENG
Jianhua LI
Xinhui NIE
Bowen LI
Chuang TAI

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ZHENG Mincong, LI Jianhua, NIE Xinhui, LI Bowen, TAI Chuang. Corrosion Behavior of Galvanized Q235 Steel for Grounding in Acid Soils. Journal of Chinese Society for Corrosion and protection, 2015, 35(1): 27-32.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.251     OR     https://www.jcscp.org/EN/Y2015/V35/I1/27

Fig.1  Nyquist (a) and Bode (b) splots of galvanized steel in the soil acidified by pH=2.2 acidification solution
Fig.2  Nyquist (a) and Bode (b) plots of galvanized steel in the soil acidified by pH=3.6 acidification solution
Fig.3  Nyquist (a) and Bode (b) plots of galvanized steel in the soil acidified by pH=4.0 acidification solution
Fig.4  Equivalent circuits used to fit experimental impedance data for galvanized steel immersed in acidified soils: (a) at the initial stage, (b) after long time
pH Time / d Rs / Ω Rf / Ω Q / F H z 1 - n 1 n1 Rct / Ω Q / F H z 1 - n 2 n2 L / H
2.2 0.125 260.10 522.30 2.41×10-9 1.057 7363 9.91×10-9 0.589 10.68
0.33 268.90 488.50 2.89×10-9 1.075 4673 1.05×10-8 0.588 4.79
1 87.46 686.70 2.28×10-9 1.020 4157 1.10×10-8 0.588 ---
2 90.26 606.40 2.01×10-9 1.009 3378 1.09×10-8 0.581 ---
4 68.61 589.50 1.93×10-9 1.012 3356 1.00×10-8 0.577 ---
7 49.63 659.40 1.38×10-9 0.981 4353 1.17×10-8 0.594 ---
13 73.23 587.50 1.61×10-9 0.986 6386 2.38×10-8 0.621 ---
20 86.06 368.40 2.25×10-9 0.992 9600 5.02×10-8 0.641 ---
3.6 0.125 13.29 1398 2.46×10-10 0.762 13592 4.26×10-8 0.640 10.53
0.33 209.60 1018 1.26×10-9 0.808 9774 3.95×10-8 0.631 5.13
1 201.40 864.30 2.04×10-9 0.842 8028 3.15×10-8 0.621 ---
2 84.47 834.40 1.71×10-9 0.995 6815 2.50×10-8 0.607 ---
7 153.80 677.30 2.04×10-9 0.940 9200 2.43×10-8 0.603 ---
13 100.70 636.20 2.28×10-9 0.990 10698 2.10×10-8 0.594 ---
20 44.35 578.60 1.25×10-9 0.969 12839 2.60×10-8 0.598 ---
4.0 1 4.83×10-5 1501 8.59×10-10 0.949 11292 7.35×10-9 0.577 ---
2 1.01×10-5 1548 8.30×10-10 0.952 10176 5.82×10-9 0.569 ---
4 1.67×10-5 1404 7.86×10-10 0.923 8500 6.17×10-9 0.563 ---
7 1.54×10-6 1363 6.95×10-10 0.909 8148 6.02×10-9 0.556 ---
13 9.68×10-7 1069 6.36×10-10 0.891 11398 6.27×10-9 0.552 ---
20 29.73 622.70 8.36×10-10 0.921 15313 3.43×10-9 0.525 ---
Table1  Electrochemical parameters of galvanized steel in acidified soils
Fig.5  Curves of Rp vs experimental time
Fig.6  Polarization curves of galvanized steel in the soils acidified by pH=2.2 (a), pH=3.6 (b) and pH=4.0 (c) solutions
pH Time / d Ecorr / V Icorr / Acm-2 βa / mV βc / mV
2.2 1 -1.03 9.62×10-6 144.98 194.83
2 -1.04 9.92×10-6 176.34 236.78
4 -1.05 9.55×10-6 185.83 216.02
7 -1.05 7.16×10-6 197.35 197.36
13 -1.04 3.23×10-6 111.05 135.37
20 -1.03 1.77×10-6 84.52 149.06
3.6 1 -1.00 6.14×10-6 187.35 391.48
2 -1.04 9.92×10-6 220.88 456.92
7 -1.00 2.70×10-6 116.97 145.03
13 -0.99 3.31×10-6 150.67 201.67
20 -0.98 1.54×10-6 76.73 116.90
4.0 1 -0.10 5.01×10-6 231.79 406.42
2 -1.00 4.30×10-6 232.09 311.20
4 -0.96 6.16×10-6 259.53 383.20
7 -0.95 6.16×10-6 255.35 356.25
13 -0.97 4.07×10-6 177.58 307.02
20 -1.00 1.93×10-6 104.93 206.97
Table 2  Tafel fitting results of polarization curves
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