Inhibition Effect of Polyvinylpyrrolidone on Corrosion of Reinforcing Steel in Simulated Concrete Pore Solutions†

doi:10.7503/cjcu20170648

Abstract

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

CLC Number:

O646

TrendMD:

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^†[J]. Chem. J. Chinese Universities, 2018, 39(6): 1260.

Figures/Tables 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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