Study on Sodium β-glycerophosphate in Concrete Affects the Inhibited Behavior of Steel Bar

doi:10.12141/j.issn.1000-565X.230030

Abstract

Abstract:

In the high alkaline environment of concrete, in order to improve the resistance of steel bar in concrete to chloride ion erosion, this study adopted a new environmentally friendly organic rust inhibitor-β-glycerophosphate sodium to protect the steel bar and achieve the purpose of extending the service life of reinforced concrete structures. In this study, the electrochemical measurements were used to monitor the evolution properties of the steel embedded in concrete in real time. The corresponding key parameters were obtained to explore the relationship between sodium β-glycerophosphate and steel passive film in the passivation period, as well as the relationship among sodium β-glycerophosphate, steel passive film and chloride ions during the maintenance passivation period, and then the rust resistance mechanism of this kind of organic matter was revealed. The results obtained by OCP, LPR and EIS electrochemical testing methods show that: β-sodium glycerophosphate forms a more density protective film through physicochemically interacting with Fe oxides/hydroxides on the steel surface, so as to make the surface of the steel bar form a protective film with more inhibited behavior, which also improves the resistance of the steel bar under chloride ion erosion. The resistance of the steel bar in each of the four solutions is: NaOH + 0.1 mol/L sodium β-glycerophosphate > saturated clarified Ca(OH)₂ > NaOH > saturated clarified Ca(OH)₂ + 0.1 mol/L sodium β-glycerophosphate. Among them, the critical chloride ion concentrations (c_crit) of steel bars in NaOH, NaOH + 0.1 mol/L sodium β-glycerophosphate and saturated clarified Ca(OH)₂ solutions are: 0.02 mol/L, 0.07 mol/L, and 0.04 mol/L, respectively, while no effective passive film is generated on the steel bar in saturated clarified Ca(OH)₂ + 0.1 mol/L sodium β-glycerophosphate. In addition, the addition of sodium β-glycerophosphate to Na⁺ solutions can promote the formation of a more dense passive film on the steel bar surface with a faster passivation rate. That is, more than 80% passivation film can be formed in 72 h, and the rust inhibitor rate is as high as 99.80%. Furthermore, further comparative analyses of the effects the Na⁺ and Ca²⁺ solutions themselves on the resistance of the steel bar under chloride ions erosion show that Ca²⁺ solution is more conducive to the resistance to chloride ion erosion ability, and the corrosion inhibition efficiency is more than 90%.

Key words: concrete simulation pore solution, sodium β-glycerophosphate, passive film, chloride ion, electrochemical behavior

CLC Number:

TU528

WANG Xiaoxian, LIU Jiaping, MU Song, et al. Study on Sodium β-glycerophosphate in Concrete Affects the Inhibited Behavior of Steel Bar[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(3): 28-40.

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元素	C	Si	Mn	P	S	V
质量分数/%	0.23	0.50	1.34	0.022	0.021	0.023
元素	Cr	Cu	Ni	Mo	Fe
质量分数/%	0.01	0.02	0.01	0.003	其余部分

溶液类型	NaCl添加增量/（mol·L^-1）
溶液类型	开始	1次	2次	3次	4次	5次	6次	7次	8次
NaOH	0.002	0.004	0.008	0.010	0.012	0.016	0.020	0.024	0.028
NaOH+0.1 mol/L β-甘油磷酸钠	0.005	0.010	0.015	0.020	0.030	0.040	0.050	0.070	0.100
饱和澄清Ca（OH）₂	0.005	0.010	0.015	0.020	0.030	0.040	0.050	0.070	0.100
饱和澄清Ca（OH）₂+0.1 mol/L β-甘油磷酸钠	0.010	0.020	0.025	0.035	0.045	0.055	0.075	0.105	0.145

样品	电化学参数
样品	R_s/Ω	R_f/ （kΩ·cm²）	CPE_f/ （μF·cm^-2）	n_f	R_ct/ （kΩ·cm²）	CPE_dl/ （μF·cm^-2）	n_dl	W	χ²/10^-3	η_E1/%	η_E2/%
NaOH溶液	25.18	—	—	—	2.04	74.873	0.81	0.005 5	0.903	—	—
NaOH+0.1 mol/L β-甘油磷酸钠	16.55	2.09	58.252	0.84	999.55	42.002	0.77	—	0.574	99.80	—
饱和澄清Ca（OH）₂	41.49	—	—	—	345.93	40.558	0.87	—	5.669	—	99.41
饱和澄清Ca（OH）₂+0.1 mol/L β-甘油磷酸钠	14.54	—	—	—	354.87	46.955	0.83	0.004 2	13.123	2.52	—

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