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Journal of Chinese Society for Corrosion and protection  2016, Vol. 36 Issue (2): 177-184    DOI: 10.11902/1005.4537.2015.079
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Corrosion Inhibition of Equisetum Ramosissimum Extractive for Carbon Steel in Hydrochloric Acid Solution
Wen CHEN(),Chunping GUAN,Shenming YANG,Xiaoan HU
Department of Chemistry and Life Science, Chuxiong Normal University, Chuxiong 675000, China
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Abstract  

The inhibition effect of Equisetum ramosissimum extractive (ERE), extracted by hot water extraction method, on the corrosion of Q235 steel in 1 molL-1 HCl solution was investigated by means of polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that ERE could effectively inhibited the steel corrosion, and acted as a mixed-type inhibitor with predominant control of the cathodic reaction. The inhibition efficiency increased with increasing dose of the extractive and was stable within the range of experimental temperature (20~50 ℃). By fitting the EIS data, it was found that the adsorption of ERE molecules on the steel surface obeyed both the Langmuir and the Dhar-Flory-Huggins adsorption isotherms. Spectroscopic analysis and scanning electron microscope observation confirmed existence of a adsorbed film of ERE on the steel surface.
Key words:  Q235 steel      equisetum ramosissimum      polarization curve      electrochemical impedance spectroscopy     
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Wen CHEN
Chunping GUAN
Shenming YANG
Xiaoan HU

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Wen CHEN,Chunping GUAN,Shenming YANG,Xiaoan HU. Corrosion Inhibition of Equisetum Ramosissimum Extractive for Carbon Steel in Hydrochloric Acid Solution. Journal of Chinese Society for Corrosion and protection, 2016, 36(2): 177-184.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.079     OR     https://www.jcscp.org/EN/Y2016/V36/I2/177

Fig.1  Polarization curves of Q235 steel in 1 molL-1 HCl solutions containing various concentrations of ERE at 20 ℃ (a), 30 ℃ (b), 40 ℃ (c) and 50 ℃ (d)
Temperature / ℃ c / mgL-1 Ecorr / mV ba / mVdec-1 bc / mVdec-1 Icorr / μAcm-2 IE / %
20 Blank -432 97.9 124.8 1265
30 -457 68.3 101.7 241 81.0
60 -453 69.5 105.7 203 84.0
150 -449 74.6 109.8 174 86.2
300 -467 73.8 120.0 138 89.1
600 -464 74.4 136.0 128 89.9
30 Blank -439 103.2 135.7 2369 ---
30 -450 72.4 94.4 350 85.2
60 -455 74.6 100.1 327 86.2
150 -471 72.6 100.9 178 92.5
300 -475 74.2 104.3 156 93.4
600 -492 83.2 107.6 150 93.7
40 Blank -423 102.5 139.9 5772 ---
30 -429 82.9 141.2 188 67.3
60 -438 66.4 112.5 653 88.7
150 -450 68.2 109.9 378 93.4
300 -465 69.7 105.7 339 94.1
600 -470 74.7 107.3 281 95.1
50 Blank -398 101.3 131.2 6335 ---
30 -411 82.1 129.5 3005 52.6
60 -430 89.3 131.2 1818 71.3
150 -441 69.5 116.2 997 84.3
300 -448 78.3 118.8 854 86.5
600 -448 85.7 118.4 779 87.7
Table 1  Polarization parameters for Q235 steel in 1 molL-1 HCl containing different concentrations of ERE at different temperatures
Fig.2  Nyquist plots for Q235 steel in 1 molL-1 HCl solutions containing various concentrations of ERE at 20 ℃ (a), 30 ℃ (b), 40 ℃ (c) and 50 ℃ (d)
Fig.3  Equivalent circuit modes for Q235 steel in 1 molL-1 HCl solutions without (a) and with(b) ERE
Temperature / ℃ c / mgL-1 Cdl / μFcm-2 Rct / Ωcm2 Cf / mFcm-2 Rf / Ωcm2 IE / %
20 Blank 257 22.7 --- --- ---
30 117 117.4 18.9 15.6 82.9
60 102 143.9 13.9 29.2 86.8
150 86 175.6 25.2 56.3 90.2
300 66 249.6 8.6 72.9 92.9
600 61 283.2 5.8 101.4 94.1
30 Blank 334 14.8 --- --- ---
30 175 40.8 10.9 17.2 74.5
60 112 78.3 37.2 10.5 83.3
150 64 144.5 17.0 22.2 91.1
300 52 162.7 23.3 38.1 92.6
600 44 187.6 11.0 53.6 93.9
40 Blank 574 8.3 --- --- ---
30 201 24.73 15.6 2.2 69.1
60 132 49.4 22.9 4.7 84.6
150 76 67.9 13.7 9.9 89.3
300 52 83.8 10.2 16.9 91.7
600 47 92.9 2.3 22.6 92.8
50 Blank 761 4.6 --- --- ---
30 375 9.0 20.9 1.4 55.7
60 161 20.9 22.3 1.9 79.8
150 109 27.4 12.8 4.9 85.7
300 77 36.2 10.7 8.6 89.7
600 68 42.9 19.4 12.0 91.6
Table 2  Impedance parameters for Q235 steel in 1 molL-1 HCl solutions containing different concentrations of ERE at different temperatures
Fig.4  Fitted plots from Langmuir (a) and Dhar-Flory-Huggins (b) adsorption isotherms
Temperature / ℃ Adsorption isotherm model R2 Kads / Lmg-1 x ΔGadsθ / kJmol-1
20 Langmiur 0.999 0.162 --- -29.2
Dhar-Flory-Huggins 0.983 1.077 3.01 -33.8
30 Langmiur 0.999 0.119 --- -29.4
Dhar-Flory-Huggins 0.982 2.367 3.53 -37.0
40 Langmiur 0.999 0.111 --- -30.2
Dhar-Flory-Huggins 0.973 2.151 3.79 -37.9
50 Langmiur 0.999 0.063 --- -29.7
Dhar-Flory-Huggins 0.985 0.250 2.74 -33.4
Table 3  Fitted parameters from Langmuir and Dhar-Flory-Huggins models
Fig.5  FTIR spectrum of adsorption film of ERE
Fig.6  UV spectra of 1 molL-1 HCl solution with 150 gL-1 ERE before and after Q235 steel immersion for 24 h
Fig.7  Surface morphologies of Q235 steel after immersion for 8 h in 1 molL-1 HCl solutions without (a) and with (b) 150 mgL-1 ERE
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