Study on high temperature oxidation behavior of weathering steel Q235NH
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摘要: 为了明确含有Si和Cr耐候钢Q235NH的高温氧化行为，对耐候钢Q235NH在700～1200 ℃进行氧化试验，采用光学显微镜(OM)、扫描电子显微镜(SEM)和能谱仪(EDS) 以及X射线衍射仪(XRD)等手段对氧化铁皮成分进行分析，结合氧化动力学曲线，分析了其氧化结构演变过程。试验结果表明：Q235NH氧化铁皮的生成符合抛物线规律，其激活能为146 kJ/mol。氧化铁皮结构包括最外层较薄的Fe2O3和Fe3O4层，中间层为较厚的FeO和块状先共析Fe3O4组成。此外，当加热温度小于1100 ℃ 时，在氧化铁皮和基体之间还会形成较薄且连续的富硅富铬层，对铁离子的向外扩散有一定的阻碍作用，从而使得氧化更难进行，但当加热温度大于1100 ℃后，硅铬层遭到破坏，这会促进氧化的进行。Abstract: To clarify the high temperature oxidation behavior of weathering steel Q235NH containing Si and Cr, the oxidation experiment of weathering steel Q235NH was carried out at 700 ～ 1 200 ℃. The composition of iron oxide scale was analyzed by optical microscope (OM),scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The evolution process of oxidation structure was analyzed by investigating oxidation kinetics curve. The results show that the iron oxide scale formation of Q235NH steel complies with the parabolic law, and its activation energy is 146 kJ/mol. The iron oxide scale structure consists of thin Fe2O3 and Fe3O4 layers in the outermost layer and thick FeO and massive proeutectoid Fe3O4 layers in the middle layer. In addition, when the heating temperature is lower than 1 100 ℃, a thin continuous silicon chromium rich layer will be formed between the scale and the substrate, which will hinder the outward diffusion of iron ions, making the oxidation more difficult. However, when the heating temperature is greater than 1100 ℃, the silicon chromium layer will be destroyed, which will promote the oxidation.
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Key words:
- weathering steel /
- high temperature oxidation /
- ferrous silicate /
- section morphology
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图 3 不同温度氧化3 h后氧化铁皮表面形貌
（a）700 ℃；（b）900 ℃；（c）1 200 ℃
Figure 3. Surface morphologies of iron oxide scale oxidized at different temperatures for 3 hours
图 4 Q235NH钢不同温度下氧化30 min后的氧化铁皮断面形貌
(a) 800 ℃；(b) 900 ℃；(c) 1 000 ℃；(d) 1 100 ℃；(e) 1 150 ℃；(f) 1 200 ℃
Figure 4. Cross-sectional morphologies of iron oxide scale of Q235NH steel oxidized at different temperatures for 30 min
图 5 Q235NH不同温度下氧化3 h表面氧化铁皮XRD图谱
Figure 5. XRD pattern of iron oxide scale on Q235NH oxidized for 3 hours at different temperatures
图 6 Q235NH钢在1000 ℃时氧化30 min的SEM图及面扫描图谱
Figure 6. SEM and surface scan images of Q235NH steel oxidized at 1 000 ℃ for 30 min
图 7 Q235NH钢在1200 ℃时Fe2SiO4/FeO的面扫描图谱
Figure 7. Surface scan images of Q235NH steel oxidized at 1 200 ℃ for 10 min
表 1 Q235NH在不同氧化温度下的氧化速率常数
Table 1. Oxidation rate constants of Q235NH at different oxidation temperatures
氧化温度/℃ 氧化时间/h Kp/(mg2·cm−4·h−1) 700 3 8.34 800 3 21.18 900 3 91.37 1000 3 673.11 1100 3 995.32 1150 3 1963.44 1200 3 2692.20 
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