聚乙烯吡咯烷酮对模拟混凝土孔隙液中钢筋的缓蚀效应

doi:10.7503/cjcu20170648

摘要/Abstract

摘要：

应用电化学阻抗谱和极化曲线测试技术, 结合扫描电子显微镜(SEM)、 X射线光电子能谱(XPS)和拉曼(Raman)光谱分析, 研究了表面活性剂聚乙烯吡咯烷酮(PVP) 作为缓蚀剂对钢筋的缓蚀效应和机理. 结果表明, PVP对pH值为11.0, 含0.5 mol/L NaCl的模拟混凝土孔隙液中的钢筋具有良好的缓蚀作用, 可有效抑制钢筋的腐蚀; PVP浓度变化对钢筋腐蚀行为有显著的影响, 当浓度为25 mg/L时, PVP对钢筋的缓蚀效率达到89.1%; PVP通过在钢筋表面形成吸附膜来抑制钢筋的腐蚀.

关键词: 表面活性剂, 缓蚀剂, 聚乙烯吡咯烷酮, 钢筋, 模拟混凝土孔隙液

Abstract:

Surfactant polyvinylpyrrolidone(PVP) was used as a potential corrosion inhibitor for reinforcing steel. The corrosion inhibition effect and mechanism of PVP for the reinforcing steel in the simulated polluted concrete pore solution at pH=11.0 with 0.5 mol/L NaCl were studied by electrochemical impedance spectroscopy and polarization curve measurements, scanning electron microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy. The results indicated that the PVP concentration had an important effect on the corrosion behavior of the steel in the solution. The PVP with the optimum concentration could effectively inhibit the corrosion of the reinforcing steel. The inhibition efficiency of PVP reached 89.1% when its concentration was 25 mg/L. PVP formed an adsorption film on the surface of the reinforcing steel and protected the steel from corrosion.

Key words: Surfactant, Corrosion inhibitor, Polyvinylpyrrolidone, Reinforcing steel, Simulated concrete pore solution

中图分类号:

O646

TrendMD:

董士刚, 高颖波, 官自超, 王海鹏, 王霞, 杜荣归, 宋光铃. 聚乙烯吡咯烷酮对模拟混凝土孔隙液中钢筋的缓蚀效应. 高等学校化学学报, 2018, 39(6): 1260.

DONG Shigang, GAO Yingbo, GUAN Zichao, WANG Haipeng, WANG Xia, DU Ronggui, SONG Guangling. Inhibition Effect of Polyvinylpyrrolidone on Corrosion of Reinforcing Steel in Simulated Concrete Pore Solutions^†. Chem. J. Chinese Universities, 2018, 39(6): 1260.

图/表 7

Fig.1 Nyquist plots of reinforcing steel in the simulated polluted concrete pore solution with different PVP concentrationsc(PVP)/(mg·L-1): a. 0; b. 10; c. 25; d. 50; e. 100; f. 300. Inset: equivalent circuit.

Table 1 Fitting results for impedance spectra of reinforcing steel corresponding to Fig.1

c(PVP)/(mg·L^-1)	R_s/(Ω·cm²)	R_ct/(kΩ·cm²)	10⁵Y₀/(Ω^-1·cm^-2·sⁿ)	n
0	45.4	8.28	14.70	0.81
10	22.8	6.13	17.00	0.82
25	31.6	39.70	9.07	0.88
50	17.4	24.40	9.47	0.88
100	36.3	8.89	13.00	0.84
300	26.1	5.23	10.90	0.86

Table 2 Fitting results for linear polarization curves of reinforcing steel in the simulated polluted concrete pore solution and inhibition efficiency of PVP

c(PVP)/(mg·L^-1)	i_corr/(μA·cm^-2)	E_corr/V(vs. SCE)	R_p/(kΩ·cm²)	η(%)
0	0.490	-0.507	9.48	—
10	0.469	-0.470	7.19	4.31
25	0.053	-0.387	38.80	89.1
50	0.145	-0.414	20.20	70.4
100	0.477	-0.452	10.10	2.65
300	0.602	-0.455	5.91	—

Fig.2 Potentiodynamic anodic polarization curves of reinforcing steel in the simulated polluted concrete pore solution with different PVP concentrationsc(PVP)/(mg·L-1): a. 0; b. 10; c. 25; d. 50; e. 100; f. 300.

Fig.3 SEM images of reinforcing steel before and after immersion in the simulated polluted concrete pore solution(A) Before test; (B) the solution without PVP; (C) the solution with 25 mg/L PVP.

Fig.4 XPS spectra of reinforcing steel after immersion in the simulated polluted concrete pore solution without(a) and with(b) PVP(A), N1s with PVP(B), Fe2p3/2 without PVP(C) and with PVP(D)

Fig.5 Raman spectrum of reinforcing steel after immersion in the simulated polluted concrete pore solution with 25 mg/L PVP

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