CORROSION BEHAVIOR OF 20SiMn STEEL REBAR IN CARBONATE/BICARBONATE SOLUTIONS WITH THE SAME pH VALUE

doi:10.3724/SP.J.1037.2014.00041

Acta Metall Sin

2014, Vol. 50

Issue (6): 674-684 DOI: 10.3724/SP.J.1037.2014.00041

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CORROSION BEHAVIOR OF 20SiMn STEEL REBAR IN CARBONATE/BICARBONATE SOLUTIONS WITH THE SAME pH VALUE

CAO Fengting, WEI Jie, DONG Junhua(

), KE Wei

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

CAO Fengting, WEI Jie, DONG Junhua, KE Wei. CORROSION BEHAVIOR OF 20SiMn STEEL REBAR IN CARBONATE/BICARBONATE SOLUTIONS WITH THE SAME pH VALUE. Acta Metall Sin, 2014, 50(6): 674-684.

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Abstract

The aggressive ions, such as Cl^- and SO₄^2-, as well as the carbonation caused by CO₂ from the air are two main reasons for the depassivation of steel rebar in reinforcement concrete. Under normal conditions, the pH value of concrete pore solution is taken as the criterion for determining whether the corrosion of steel occurs or not. However, carbonation process results not only in the decrease of the pH value of concrete pore solution, but also in the accession of HCO₃^- and CO₃^2-. It is demonstrated that these two ions are able to influence the corrosion behaviors of steel rebar. Additionally, the failure of reinforcement concrete is a time consuming process, so the corrosion evolution laws of steel at the presence of HCO₃^- and CO₃^2- is necessary to study systemically. Nevertheless, little relative work has been done so far. In this work, the electrochemical behavior of 20SiMn steel in three different content carbonate buffer solutions (0.01, 0.05 and 0.5 mol/L) was studied using electrochemical techniques (polarization curves, free corrosion potential measurements, EIS, Mott-Schottcky (MS) curves and cycle voltage curves) and surface analysis techniques (SEM and in situ Raman spectroscopy), compared with that in NaOH solution (0.437×10^-3 mol/L ). These four solutions are of the same pH value 10.64. The results indicated that 20SiMn steel was in active corrosion state in NaOH solution and low content carbonate solution, while it was in passive state in high content carbonate solutions. In NaOH solution, 20SiMn steel was destroyed by uniform corrosion and the corrosion products were a-Fe₂O₃ and g-FeOOH, transformed from Fe(OH)₂. In 0.01 mol/L carbonate solution, 20SiMn steel was destroyed by localized corrosion, and the final products were a-Fe₂O₃ and b-FeOOH, developed from the intermediate products GRs (green rusts). The passive film formed on 20SiMn steel was more resistive in 0.05 mol/L carbonate solution than that in 0.5 mol/L due to the formation of soluble complex anion Fe(CO₃)₂^2- in latter solution. There was a maximum corrosion resistance of the passive film with the increase of carbonate content.

Key words: 20SiMn steel carbonate buffer solution steel rebar electrochemistry Raman spectroscopy corrosion

Received: 20 January 2014

ZTFLH:

TG174

Fund: Supported by National Natural Science Foundation of China (No.51131007)

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	Fengting CAO
	Jie WEI
	Junhua DONG
	Wei KE

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2014.00041 OR https://www.ams.org.cn/EN/Y2014/V50/I6/674

Fig.1 Micro-corrosion morphologies of 20SiMn steel immersed for 7 d in 0.437×10^-3 mol/L NaOH solution (a), 0.01 mol/L (b), 0.05 mol/L (c) and 0.5 mol/L (d) carbonate buffer solutions

Fig.2 In situ Raman spectra of 20SiMn steel immersed for 7 d in 0.437×10^-3 mol/L NaOH (a) and 0.01 mol/L carbonate buffer solution (b)

Fig.3 Micro-corrosion morphologies of 20SiMn steel (a) and after removal of corrosion products immersed in 0.01 mol/L carbonate buffer solution for 10 min (b), 30 min (c), 1 h (d) and 7 d (e), and in 0.437×10^-3 mol/L NaOH solution for 7 d (f) (Insets show the corresponding enlarged images)

Fig.4 Potentiodynamic polarization curves of 20SiMn steel in 0.437×10^-3 mol/L NaOH, and 0.01, 0.05 and 0.5 mol/L carbonate buffer solutions

Fig.5 Open circuit potential of 20SiMn steel in 0.437×10^-3 mol/L NaOH, and 0.01, 0.05 and 0.5 mol/L carbonate buffer solutions

Fig.6 EISs of 20SiMn steel immersed for 7 d in 0.437×10^-3 mol/L NaOH (a), and 0.01 mol/L (b), 0.05 mol/L (c) and 0.5 mol/L (d) carbonate buffer solutions

Fig.7 Fig.7 Equivalent electrical circuit used to fit the EIS results in 0.437×10^-3 mol/L NaOH (a), and 0.01^{mol/L (b), 0.05^{mol/L (a) and 0.5^{mol/L (a) carbonate solutions (R_s—solution resistance, Q_dl—constant phase element of electric double layer, R_ct—charge transfer resistance, Z_W—Warburg resistance, Q₁—constant phase element of rust layer or passive film layer, R₁—resistance of rust layer or passive film layer)}}}

Table 1 EIS fitting results of the parameters in 0.437×10^-3 mol/L NaOH solution

Table 2 EIS fitting results of the parameters in 0.01 mol/L carbonate buffer solution

Fig.8 Relationships between R_ct or R₁ and immerse time in 0.437×10^-3 mol/L NaOH and 0.01 mol/L carbonate buffer solution (a), and 0.05 mol/L and 0.5 mol/L carbonate buffer solutions (b)

Table 3 EIS fitting results of the parameters in 0.05 mol/L carbonate buffer solution

Table 4 EIS fitting results of the parameters in 0.5 mol/L carbonate buffer solution

Fig.9 Mott-Schottcky (MS) plots of 20SiMn steel immersed for 7 d in 0.05 and 0.5 mol/L carbonate buffer solutions

Fig.10 Cyclic voltammograms for the 20SiMn steel in 0.437×10^-3 mol/L NaOH (a), and 0.01 mol/L (b), 0.05 mol/L (c) and 0.5 mol/L (d) carbonate buffer solutions

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