High temperature oxidation behavior and kinetics of HRB400 rebar
ZHOU Da-qian1, LU Heng-chang1, LI Zhi-feng2, WEI Xi-cheng1, DONG Han1
1. School of Material Science and Engineering, Shanghai University, Shanghai 200444, China; 2. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Nei Mongol, China
Abstract：In order to optimize the oxide layer structure of HRB400 rebar to improve corrosion resistance, the oxidation behavior of test steel under air condition at temperatures of 800, 850, 900, 950, 1 000 and 1050 ℃ was investigated using the thermogravimetric method. An oxidation kinetic model was developed, the oxidation activation energy of test steel was calculated, and the structure and composition of oxide layer was analyzed and determined by scanning electron microscopy (SEM). The oxidation layer formation law was discussed in relation with the actual production of rebar and an oxidation skin growth model was established. The results showed that the oxidation of test steel had a fast oxidation phase with a linear oxidation kinetic curve in the early stages and a slow oxidation phase with a parabolic oxidation kinetic curve in the middle and late stages, and the time required to change from linear to parabolic increased with the temperature increasing. The oxidation activation energy of test steel was 208.4 kJ/mol which was calculated by Origin fitting. The best macroscopic condition of test steel oxide skin surface appeared at an oxidation temperature of 900 ℃, and varying degrees of flaking and damage to the test steel oxide skin at all other oxidation temperatures. At the oxidation temperatures of 850 and 900 ℃, only dark grey outer layer of Fe3O4 and light grey inner layer of FeO were observed in the test steel oxide due to the low oxidation temperature which could not break through the energy barrier for Fe2O3 production. The oxide skin of test steel at oxidation temperatures of 950, 1 000 and 1 050 ℃ consisted of a three-layer structure of Fe2O3, Fe3O4 and FeO. As the oxide skin undergone pre-eutectoid reaction (precipitation of Fe3O4 from FeO) and eutectoid reaction (transformation of FeO into Fe3O4 + Fe) during cooling, a complex oxide skin structure was resulted in.
周大骞, 陆恒昌, 李志峰, 韦习成, 董瀚. HRB400螺纹钢的高温氧化行为及动力学[J]. 钢铁, 2022, 57(3): 108-114.
ZHOU Da-qian, LU Heng-chang, LI Zhi-feng, WEI Xi-cheng, DONG Han. High temperature oxidation behavior and kinetics of HRB400 rebar[J]. Iron and Steel, 2022, 57(3): 108-114.
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2022, Vol. 57 
