ABSTRACT

To optimising the corrosion resistance mechanism of hot-rolled steel bar, the effects of different tempering temperatures and high-oxygen-rich oxidation times were studied by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, electrochemical and atmospheric corrosion tests. The thickness of the oxide layer of the rebar could reach 10 μm and rarely corroded after high-oxygen-rich oxidation at 850°C for 1 s, which exhibits superior corrosion resistance. The electrochemical test results showed that the I_corr value after 1 s of high-oxygen-rich oxidation at 850°C was about 0.02 mA cm⁻², which was 56.4% lower than that of the heated specimen at 685°C (0.045 mA cm⁻²). The results of Raman spectroscopy showed that the rust layer of the heated specimen at 685°C mainly consisted of α-Fe₂O₃, γ-FeOOH and α-FeOOH, and the oxidised layer after 1 s of high-oxygen-rich oxidation at 850°C mainly consisted of α-Fe₂O₃ and Fe₃O₄, which maintained the original oxidised layer morphology.

摘要

为优化热轧钢筋的耐蚀机理，通过扫描电镜、X射线衍射、拉曼光谱、电化学和大气腐蚀试验研究了不同回火温度和高富氧氧化次数的影响。850℃高富氧氧化1 s后，钢筋氧化层厚度可达10 μm，极少腐蚀，具有优异的耐腐蚀性能。电化学测试结果表明，850℃高富氧氧化1 s后的I _{corr值约为0.02 mA cm} ^-2，比685 ℃加热试样（0.045 mA）降低56.4%。厘米^-2）。拉曼光谱结果表明，685℃加热试样的锈层主要由α-Fe ₂ O ₃、γ-FeOOH和α-FeO​​OH组成，高富氧氧化1 s后的氧化层850℃时主要由α-Fe ₂ O ₃和Fe ₃ O ₄组成，保持原有的氧化层形态。