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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (1): 49-54    DOI: 10.11902/1005.4537.2014.141
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Inhibition Performance of Benzimidazole Derivatives for Steel 45(GB) in 1 mol/L HCl Solution
WANG Qing, MA Xuemei, SHI Haiyan, YUAN Shan, GUO Jianfeng, LIANG Dong, HU Zhiyong()
College of Chemical Engineering and Environment, North University of China, Taiyuan 030051, China
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Abstract  

Two new benzimidazole derivatives, BSC6T and BSC8T, were synthesized using 2-aminobenzimidazole and triazine anionic surfactants. Their inhibition effect on steel 45(GB) in 1 mol/L HCl solution were studied by means of mass loss method, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Results showed that the inhibition efficiency increased significantly with the increasing inhibitor concentration; BSC6T and BSC8T acted as a mixed type inhibitors with cathodic inhibition as the dominative action; BSC6T and BSC8T had better inhibition effect rather than 2-aminobenzimidazole; however, among the three inhibitors, BSC8T exhibited the best inhibition performance with inhibition efficiency up to 98.6% for a concentration of 0.9 g/L.
Key words:  inhibitor      benzimidazole derivative      anionic surfactant      electrochemical measurement     
ZTFLH:  TG174.42  
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Articles by authors
Qing WANG
Xuemei MA
Haiyan SHI
Shan YUAN
Jianfeng GUO
Dong LIANG
Zhiyong HU

Cite this article: 

WANG Qing, MA Xuemei, SHI Haiyan, YUAN Shan, GUO Jianfeng, LIANG Dong, HU Zhiyong. Inhibition Performance of Benzimidazole Derivatives for Steel 45(GB) in 1 mol/L HCl Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(1): 49-54.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.141     OR     https://www.jcscp.org/EN/Y2015/V35/I1/49

Fig.1  Structures of BSC6T (a) and BSC8T (b)
Fig.2  Inhibition efficiency of 45(GB) steel in 1 mol/L HCl solutions containing different concentrations of inhibitors
Fig.3  Polarization curves of 45(GB) steel in 1 mol/L HCl solutions containing different concentrations of 2-aminobenzimidazole (a), BSC6T (b) and BSC8T (c)
Inhibitor c / (gL-1) Ecorr (vs SCE) / mV Icorr / (mAcm-2) bc / (mVdec) ba / (mVdec) IE / %
2-amino-
benzimidazoe 		Blank -375.8 1.960 146 107 ---
0.15 -373.9 1.350 132 98.8 31.1
0.30 -387.4 0.990 113 80.8 49.5
0.45 -420.7 0.948 142 79.8 51.6
0.60 -384.5 0.877 129 107 55.3
0.75 -397.2 0.797 131 103 59.3
0.90 -395.0 0.604 137 99.1 69.2
Blank -375.8 1.960 146 107 ---
0.15 -383.2 1.220 131 91.7 37.8
0.30 -361.6 0.940 127 84.5 52.0
BSC6T 0.45 -383.4 0.748 85.1 58.6 61.8
0.60 -383.5 0.661 149 92.0 66.3
0.75 -352.5 0.512 125 71.1 73.9
0.90 -379.0 0.359 154 71.5 81.7
Blank -375.8 1.960 146 107 ---
0.15 -405.2 0.364 195 78.7 81.4
0.30 -357.9 0.309 120 79.2 84.2
BSC8T 0.45 -358.4 0.242 121 76.2 87.7
0.60 -385.5 0.117 117 64.8 94.0
0.75 -372.3 0.116 180 85.3 94.0
0.90 -394.5 0.096 171 70.5 95.1
Table 1  Dynamic polarization parameters for 45(GB) steel in 1 mol/L HCl solutions containing different concentrations of inhibitors
Fig.4  Nyquist plots of 45(GB) steel in 1 mol/L HCl solutions containing different concentrations of 2-aminobenzimidazole (a), BSC6T (b) and BSC8T (c)
Fig.5  Equivalent circuit for EIS
Inhibitor c / (gL-1) Rs / (Ωcm2) Rct / (Ωcm2) Cdl / (μFcm-2) IE / %
Blank 1.622 7.695 687.9 ---
0.15 1.271 10.74 409.9 28.4%
0.30 1.451 11.50 240.1 33.1%
2-aminobenzimidazole 0.45 1.074 12.28 223.5 37.3%
0. 60 1.313 13.46 106.3 42.8%
0.75 1.294 16.44 102.5 53.2%
0.90 1.110 19.17 82.26 59.8%
Blank 1.622 7.695 687.9 ---
0.15 1.179 15.69 199.6 50.9%
0.30 1.116 26.89 134.1 71.4%
BSC6T 0.45 1.323 76.29 109.3 89.9%
0.60 1.166 103.4 91.33 92.6%
0.75 1.300 204.7 68.53 96.2%
0.90 1.200 329.8 17.01 97.7%
Blank 1.622 7.695 687.9 ---
0.15 1.327 41.96 280 81.7%
0.30 1.266 58.85 239 86.9%
BSC8T 0.45 1.182 80.81 31.02 90.5%
0.60 1.426 155.4 23.56 95.0%
0.75 1.498 329.5 22.25 97.7%
0.90 1.244 556.1 11.52 98.6%
Table 2  Impedance data of 45(GB) steel in 1 mol/L HCl solutions containing different concentrations of inhibitors
Fig.6  SEM images of 45(GB) steel samples before corrosion (a), and after corrosion for 24 h in 1 mol/L HCl without inhibitor (b), with 0.9 g/L 2-aminobenzimidazole (c), 0.9 g/L BSC6T (d) and 0.9 g/L BSC8T (e)
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