基于癸二酸二异辛酯的环保型复合缓蚀剂对钢筋的缓蚀效应

doi:10.3866/PKU.WHXB202003033

Abstract

Abstract:

Corrosion protection of reinforcing steel in concrete is an urgent task in modern society. Use of corrosion inhibitors in concrete is an effective, simple, and economical method for protecting reinforcing steel from corrosion. Mixed corrosion inhibitors usually perform better than a single inhibitor in actual reinforced concrete systems because of their synergistic inhibition effects. In recent years, environmentally friendly corrosion inhibitors have attracted increasing attention from corrosion researchers. Diisooctyl sebacate and sodium D-gluconate are environmentally friendly organic corrosion inhibitors, and ZnSO₄ is an inorganic cathodic inhibitor, they may form an innovative, nontoxic, and pollution-free mixed corrosion inhibitor to control reinforcing steel corrosion. Additionally, diisooctyl sebacate and sodium D-gluconate serve as absorption-type inhibitors, and ZnSO₄ acts as a precipitation-type inhibitor. We hypothesized that their combination might show a good synergistic corrosion inhibition effect on reinforcing steel. In this study, we developed a diisooctyl sebacate-based mixed corrosion inhibitor that includes D-gluconate and ZnSO₄ and investigated its synergistic inhibition effects on reinforcing steel (Q235 steel) corrosion in a simulated polluted concrete pore solution. The reinforcing steel corrosion behavior and the properties of the mixed corrosion inhibitor were studied by polarization curve measurements, electrochemical impedance spectroscopy tests, and surface analysis methods (scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy). The results indicated that the reinforcing steel in the simulated polluted concrete pore solution (pH 11.00, 0.5 mol·L^-1 NaCl) was in an active dissolving state and that localized corrosion took place. The mixed corrosion inhibitor, consisting of diisooctyl sebacate (59 mmol·L^-1), sodium D-gluconate (0.5 mmol·L^-1), and ZnSO₄ (1.5 mmol·L^-1), had an obvious and powerful inhibition effect. Its inhibition efficiency reached 96.8% and 90.0% in the simulated polluted concrete pore solution and the cement mortar, respectively. The mixture of diisooctyl sebacate with sodium D-gluconate and ZnSO₄ acted as a mixed-type inhibitor and effectively controlled both anodic and cathodic reactions of the steel corrosion.

Key words: Reinforcing steel, Chloride, Localized corrosion, Corrosion inhibitor, Simulated concrete pore solution

Ya Guo, Piao Jin, Minhua Shao, Shigang Dong, Ronggui Du, Changjian Lin. Effect of an Environmentally Friendly Diisooctyl Sebacate-based Mixed Corrosion Inhibitor on Reinforcing Steel[J]. Acta Phys. -Chim. Sin. 2022, 38(4), 2003033. doi: 10.3866/PKU.WHXB202003033

Figures/Tables 12

References 58

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C_DOS (mass fracton)	i_corr/(μA∙cm^-2)	E_corr/(mV vs SCE)	-β_c/(mV∙dec^-1)	β_a/(mV∙dec^-1)	R_p/(kΩ∙cm²)	η
0%	0.561	-426	118	398	79.9	73.4%
1.0%	0.230	-431	113	208	151.8	89.1%
1.5%	0.211	-411	102	298	163.9	90.0%
2.0%	0.154	-387	90	208	228.9	92.7%
2.5%	0.122	-391	98	186	253.1	94.2%
3.0%	0.318	-442	114	221	108.7	84.9%
3.5%	0.386	-464	103	239	105.1	81.7%
4.0%	0.501	-462	140	344	82.2	76.3%

C_ZnSO4/(mmol∙L^-1)	i_corr/(μA∙cm^-2)	E_corr/(mV vs SCE)	-β_c/(mV∙dec^-1)	β_a/(mV∙dec^-1)	R_p/(kΩ∙cm²)	η
0	0.353	-383	99	218	103.2	83.3%
1.5	0.068	-379	78	155	320.4	96.8%
2.0	0.170	-433	109	183	175.6	91.9%

Inhibitor	R_s/(Ω∙cm²)	R_ct/(kΩ∙cm²)	Y₀/(10^-5 Ω^-1∙cm^-2∙sⁿ)	n	η
Without	4.71	11.4	15.47	0.82	–
With	4.47	267.6	4.07	0.89	95.7%

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Effect of an Environmentally Friendly Diisooctyl Sebacate-based Mixed Corrosion Inhibitor on Reinforcing Steel

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