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Journal of Chinese Society for Corrosion and protection  2017, Vol. 37 Issue (3): 216-220    DOI: 10.11902/1005.4537.2016.043
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Effect of External Electric Field on Inhibition Behavior of Cyclohexylamine Carbonate for Carbon Steel N80 Beneath Adsorbed Thin Electrolyte Layers
Zijing ZHU1,Lisha WEI1,Zhenyu CHEN1,2(),Yubing QIU2,Xingpeng GUO1,2
1 Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2 Key Laboratory for Material Chemistry of Energy Conversion and Storage, Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, China
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Abstract  

Effect of external electric field on the inhibition efficiency of cyclohexylamine carbonate (CHC) for carbon steel N80 beneath adsorbed thin electrolyte layers (ATEL) was investigated by means of electrochemical measurement, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results illustrated that CHC mainly suppresses the anodic corrosion reaction and has strong inhibition effect on the carbon steel corrosion. When an electric field vertical to the steel was applied, the inhibition efficiency of CHC decreased greatly and the adsorption of CHC on the carbon steel surface decreased significantly, so that the surface morphology varied quite obviously after corrosion test.The relevant quantum chemical parameters related to the corrosion inhibition efficiency of CHC were calculated by materials studio software. The acquired parameters such as dipole moment (μ), EHOMO, ELUMO and ?E all implied that the reactivity and adsorption ability of CHC were reduced significantly after applying external electric field, which affects the inhibition efficiency of CHC.
Key words:  vapor phase inhibitor      thin electrolyte film      external electric field      quantum chemical     
Received:  30 March 2016     
Fund: Supported by National Natural Science Foundation of China (51571098)
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Zijing ZHU
Lisha WEI
Zhenyu CHEN
Yubing QIU
Xingpeng GUO

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Zijing ZHU,Lisha WEI,Zhenyu CHEN,Yubing QIU,Xingpeng GUO. Effect of External Electric Field on Inhibition Behavior of Cyclohexylamine Carbonate for Carbon Steel N80 Beneath Adsorbed Thin Electrolyte Layers. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 216-220.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.043     OR     https://www.jcscp.org/EN/Y2017/V37/I3/216

Fig.1  Schematic diagram of the experimental setup for electrochemical measurements in the electrical field
Fig.2  Potentiodynamic polarization curves of N80 steel under NaCl-containing ATEL at RH 98% and 55 ℃
Test condition Ecorr / mV (vs SCE) Icorr / Acm-2 ba / mVdec-1 bc / mVdec-1 η
Blank -724 1.92×10-4 329 -167 ---
1.5×105 V/m -724 1.98×10-4 185 -174 ---
CHC -520 1.37×10-5 294 -133 92.8%
1.5×105 V/m+CHC -605 1.56×10-4 255 -138 18.8%
Table 1  Characteristic parameters obtained from polarization curves of N80 steel under NaCl-containing ATEL at RH 98% and 55 ℃
Fig.3  Nyquist plots of N80 steel under NaCl-containing ATEL at RH 98% and 55 ℃
Fig.4  Equivalent circuit for N80 steel under NaCl-containing ATEL at RH 98% and 55 ℃
Test condition Rct / Ωcm2 Qdl / SnΩ-1cm-2 Rf / Ωcm2 Qf / SnΩ-1cm-2 θ
Blank 442 5.73×10-3 15.4 2.3×10-3 ---
1.5×105 V/m 421 1.18×10-3 12.3 3.4×10-3 ---
CHC 5350 4.14×10-3 41.97 2.45×10-3 91.7%
1.5×105 V/m+CHC 521 2.31×10-3 11.5 2.38×10-4 15.2%
Table 2  Fitting parameters of EIS of N80 steel under NaCl-containing ATEL at RH 98% and 55 ℃
Fig.5  SEM images of N80 steel after corrosion for 3 d under NaCl-containing ATEL at RH 98% and 55 ℃: (a) blank, (b) 1.5×105 V/m, (c) CHC, (d) 1.5×105 V/m+CHC
Fig.6  XPS spectra of N80 steel after corrosion for 3 d under ATEL
F / Vm-1 μ / debye EHOMO / eV ELUMO / eV |ELUMO-EHOMO| / eV Negative charge on N
0 0.7922 -4.521 -4.191 0.330 -0.174
0.5×105 0.8136 -5.256 -4.810 0.446 -0.172
1.0×105 0.8233 -5.276 -4.797 0.479 -0.149
1.5×105 0.8272 -5.911 -5.334 0.577 -0.147
Table 3  Quantum chemical parameters in the electric fields with different intensities
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