摘要
通过热重分析方法和显微结构观察,研究了耐腐蚀钢筋不同加热速率下的氧化规律,并与等温氧化过程做了对比。结果表明,不同加热速率下钢筋的显微组织并没有明显差异,但是氧化层厚度随着加热速率的减小而增加。当加热速率小于10℃/min时,氧化层呈现明显的双层结构,但当加热速度为20℃/min时,氧化层几乎呈现单层结构。通过恒速加热试验建立了一种新的氧化活化能计算方法,与等温氧化试验所得值相比,加热速率为5、10、20℃/min时的相对误差分别为4.14%、5.12%和32.13%,因此,为了保证新方法的精度,试验需在较低的加热速率下进行。
The oxidation behavior of corrosion-resistant rebar at various heating rates in air was studied by thermogravimetric analysis and microstructural observation,and the results were compared with those of isothermal oxidation.It is showed that there were no significant microstructural differences at different heating rates,but the oxidation thickness increased with the decrement of the heating rate.Meanwhile,the oxide scale displayed a two-layer structure when the heating rates were under 10 ℃/min,but there was almost a single layer of the oxide at the heating rate of 20 ℃/min.A new calculation method for the oxidising activation energy was established through the constant heating rate tests.The relative errors of the heat rates of 5,10 ℃/min,and 20 ℃/min were 4.14%,5.12%,and 32.13% respectively,compared to the values obtained by the isothermal oxidation tests.Thus,in order to ensure the accuracy of the new method,tests should be carried out at comparatively low heating rates.
作者
王宝山
张宏亮
马健
冯光宏
Wang Baoshan;Zhang Hongliang;Ma Jian;Feng Guanghong(Metallurgical Technology Institute,Central Iron and Steel Research Institute,Beijing 100081,China)
出处
《钢铁钒钛》
CAS
北大核心
2023年第3期165-170,共6页
Iron Steel Vanadium Titanium
关键词
耐腐蚀钢筋
氧化动力学
加热速率
氧化活化能
等温氧化
corrosion-resistant rebar
oxidation kinetics
heating rate
oxidising activation energy
iso-thermal oxidation
作者简介
王宝山,1987年出生,男,河北邯郸人,本科,在读博士,研究方向为钢材的控轧控冷及氧化控制, E-mail:17888843510@163.com。
