Corrosion behavior of HRB500aE seismic corrosion resistant reinforcement in sodium sulfite solution
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摘要: 在亚硫酸钠溶液干湿交替环境中，对新研发的耐工业大气环境腐蚀抗震钢筋HRB500aE及对比材料HRB400普通钢筋开展周期性腐蚀试验，探讨其在模拟工业大气环境下的腐蚀行为。利用扫描电子显微镜（SEM）、能谱仪(EDS)及X射线衍射仪(XRD)分析在不同腐蚀阶段，耐蚀钢筋的表面形貌和锈层结构。结果表明，试验钢经过72 h腐蚀后内锈层形成致密的α-FeOOH结构，其耐蚀性及力学性能均明显优于普通钢筋。Cr、Ni、Cu的添加使耐蚀钢筋HRB500aE基体的腐蚀敏感性大大降低，且随着在亚硫酸钠环境下腐蚀时间的延长，其腐蚀敏感性基本稳定。耐蚀钢筋HRB500aE的锈层为双层结构，且Cu和Ni在其内锈层中出现富集，有助于形成致密的内锈层。Abstract: In the alternate wet and dry environment of sodium sulfite solution, periodic corrosion tests were carried out for both the newly developed anti-seismic rebar resistant to industrial atmospheric corrosion and reference HRB400 ordinary rebar, in order to investigate its corrosion behavior in the simulated industrial atmospheric environment. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) were used to analyze surface morphology and structure of corrosion resistant steel bars at different stages of corrosion time. The experimental results showed that after 72 hours of corrosion, the developed steel under test formed a dense α-FeOOH structure with internal rust layer, and its corrosion resistance and mechanical properties were significantly better than ordinary steel bars. The additions of Cr, Ni and Cu greatly reduce the corrosion sensitivity of HRB500aE matrix, and with corrosion time prolongs in sodium sulfite environment, the corrosion sensitivity is basically stable. The rust layer of HRB500aE is a double-layer structure, and Cu and Ni are enriched in the inner rust layer, which helps to form a dense inner rust layer.
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图 4 HRB500aE试验钢筋的腐蚀速率与时间的关系
Figure 4. Relation between corrosion rate and time for HRB500aE steel
图 5 HRB500aE试验钢筋相对HRB400的腐蚀速率统计
Figure 5. Relative corrosion rate of HRB500aE to HRB400 as function of time
图 6 HRB500aE腐蚀试样锈层截面形貌
(a)24 h；(b)72 h；(c)120 h；(d)168 h；(e)72 h高倍数；(f)120 h高倍数
Figure 6. Cross section morphology of rust layer of HRB500aE corroded samples
图 7 HRB500aE周浸腐蚀168 h试样锈层形貌及EDS分析（Cu、Ni分布）
(a)锈层形貌 (b) EDS分析
Figure 7. EDS analysis (distribution statistics of Cu and Ni) of rust layer of sample with 168 h periodic corrosion
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