Study on the corrosion behavior of a 600 MPa corrosion-resistant steel barin a chloride environment
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摘要: 以普通600 MPa级高强抗震钢筋HRB600E和经过合金调控后的同级别耐蚀钢筋为试验对象，通过周期浸润试验、电化学试验、表面分析技术和物相分析技术研究了氯盐环境下Cr、V对600 MPa级耐蚀钢筋腐蚀行为。结果表明，耐蚀合金的加入促进基体中贝氏体组织产生，减缓了铁素体阳极腐蚀进程；V、Cr元素的协同作用能够阻碍Cl−下渗，有效延缓锈层生长速度，360 h周期浸润后耐蚀钢筋腐蚀速率下降；Cr-V体系元素调控下耐蚀钢筋电化学性质自腐蚀电位提升，钝化后电位正移，腐蚀电流密度下降；耐蚀钢筋钝化后交流阻抗值显著提升，在混凝土碱性环境中耐腐蚀性能优异；合金元素调控改善了钢筋腐蚀产物的物相组成，耐蚀钢筋后期腐蚀产物中α-FeOOH及γ-FeOOH 占比更高，且内锈层有尖晶石结构产物FeCr2O4富集，增加了内锈层的致密度和稳定性。
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关键词:
- 600 MPa级耐蚀钢筋 /
- 腐蚀行为 /
- 耐蚀性能 /
- 氯离子腐蚀 /
- Cr-V体系
Abstract: The effect of Cr and V elements on the corrosion behavior of the ordinary 600 MPa grade high-strength seismic steel bar HRB600E and the same grade corrosion-resistant steel bar after alloy regulation was studied by the cyclic immersion tests, electrochemical tests, surface analysis, and phase analysis in a chloride environment. The results show that the addition of corrosion-resistant alloy promotes the formation of bainite in the matrix and slows down the corrosion process of the ferrite anode. The synergistic effect of V and Cr elements can hinder the infiltration of Cl−, effectively delaying the growth rate of the rust layer, and the corrosion rate of corrosion-resistant steel bars decreases after 360 hours of cyclic immersion. Under the control of Cr-V elements, the self-corrosion potential of the electrochemical properties of corrosion-resistant steel bars increases, while the potential shifts positively after passivation, and the corrosion current density decreases. The AC impedance value of the corrosion-resistant steel bar is significantly improved after passivation, and it shows excellent corrosion resistance in the alkaline environment of concrete. The regulation of alloying elements improves the phase composition of corrosion products of the steel bars. The proportion of α-FeOOH and γ-FeOOH in the later corrosion products of the corrosion-resistant steel bars is higher and the internal rust layer is enriched with spinel-structured product FeCr2O4, which increases the density and stability of the internal rust layer. -
图 1 HRB600cE(a)和HRB600E(b)钢筋的微观组织结构
Figure 1. Microstructures of HRB600cE (a) and HRB600E (b) bars by electron microscope
图 2 HRB600cE and HRB600E不同时长下腐蚀速率(a)和年腐蚀深度(b)
Figure 2. Corrosion rate (a) and annual corrosion depth (b) of HRB600cE and HRB600E
图 3 HRB600cE不同浸润时长下外锈层腐蚀宏观形貌
Figure 3. Corrosion profile of the outer rust layer at different immersion time of HRB600cE
(a)72 h； (b)144 h； (c)360 h
图 4 HRB600E不同浸润时长下外锈层腐蚀宏观形貌
Figure 4. Corrosion profile of the outer rust layer at different immersion time of HRB600E
(a) 72 h； (b) 144 h； (c) 360 h
图 5 试验钢周期浸润144、360 h后锈层微观形貌及能谱
(a) HRB600cE，周期浸润144 h ；(b) HRB600E，周期浸润144 h ；(c) HRB600cE，周期浸润360 h；(d) HRB600E，周期浸润360 h
Figure 5. Micromorphology of the rust layer and XRD after 144 h and 360 h immersion
图 6 HRB600cE(a)及HRB600E(b)不同时长下锈层腐蚀产物物相组成
Figure 6. XRD results of the rust layer components of HRB600cE(a) and HRB600E(b) rebars for different corrosion times
图 7 HRB600cE及HRB600E在2.0%NaCl溶液中原始态及钝化态极化曲线
Figure 7. Polarization curves of HRB600cE and HRB600E rebars in a 2.0% NaCl solution
图 8 HRB600cE及HRB600E在2%NaCl溶液中交流阻抗曲线
Figure 8. Nyquist plots of HRB600cE and HRB600E rebars in a 2% NaCl solution
表 1 试验钢化学成分
Table 1. Chemical compositions of HRB600cE and HRB600E bar
% 钢种 C Si Mn S P Cr Mo+Ni+Cu V Nb Fe HRB600cE ≤0.20 0.50 1.15 ≤0.004 ≤0.018 0.75～1.10 ≥1.10 ≤0.10 余量 HRB600E 0.26 0.70 1.54 ≤0.008 ≤0.025 ≤0.15 ≤0.012 
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表 2 锈层致密处元素组成
Table 2. Chemical compositions of the compact rust
牌号 浸润时长/h 元素占比/% O Cr V Fe Cl HRB600cE 144 5.321 0.421 0.254 93.684 0.320 360 30.835 0.158 0.301 67.726 0.980 HRB600E 144 12.822 0.023 84.341 2.267 360 27.942 0.331 69.033 2.182
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表 3 HRB600cE与HRB600E极化曲线拟合结果
Table 3. Fitting results of the polarization curves of HRB600cE and HRB600E
钢筋状态 Ecorr/mV icorr/(μA·cm−2) Ep/mV HRB600cE原始态 683 1.34 0 HRB600cE钝化后 623 0.78 29 HRB600E原始态 765 4 0 HRB600E钝化后 734 3.32 0
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