摘要
复杂岩土环境下低碳钢锚杆的腐蚀破坏对锚固工程的整体安全性具有极大威胁。为研究炭质泥岩边坡中低碳钢锚杆的腐蚀行为和揭示不同腐蚀时间下低碳钢锚杆的腐蚀特性与机理,以炭质泥岩浸泡得到的液体为腐蚀溶液,低碳钢锚杆为腐蚀试件,开展溶液腐蚀、电化学腐蚀及微观试验。结果表明,炭质泥岩环境下低碳钢锚杆产生明显的电化学腐蚀,随着腐蚀时间的延长,腐蚀产物的颜色逐渐加深,腐蚀面积逐渐增大。在腐蚀初期(0~10 d),单位面积腐蚀速率迅速加快,低碳钢锚杆表面会形成一层薄的氧化膜,随着低碳钢锚杆表面的Fe离子被氧化,氧化膜逐渐被破坏,导致腐蚀产物在低碳钢锚杆表面堆积,整个反应过程由电荷转移和物质转移共同主导。
The overall safety of anchorage engineering is jeopardized by the corrosion failure of low-carbon steel anchor bolts in a complicated geotechnical environment.To research the corrosion behaviour of low-carbon steel anchor bolts in carbonaceous mudstone slopes and to reveal the corrosion characteristics and mechanism of low-carbon steel anchor bolts under different corrosion time,solution corrosion,electrochemical corrosion and microscopic tests of low-carbon steel anchor bolts were carried out using a carbonaceous mudstone soaking solution and low-carbon steel anchor bolts as corrosion specimens.The results show that the low-carbon steel anchor bolts undergo obvious electrochemical corrosion in the carbonaceous mudstone environment.The corrosion product colour gradually deepened and the corrosion area gradually increased with increasing corrosion time.In the early stage of corrosion(0−10 d),the corrosion rate per unit area rapidly increased,and a thin oxide layer formed on the surface of the low-carbon steel anchor bolts.However,with the oxidation of Fe ions on the surface of the low-carbon steel anchor bolt body,the oxide film was gradually destroyed,resulting in the accumulation of corrosion products on the entire low-carbon steel anchor bolt surface.At this time,the entire reaction process was dominated by charge transfer and substance transfer.
作者
邱祥
凡晓明
徐鸿
李林
蒋煌斌
陈长睿
QIU Xiang;FAN Xiao-ming;XU Hong;LI Lin;JIANG Huang-bin;CHEN Chang-rui(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;School of Highway,Chang’an University,Xi’an 710064,China;School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China)
基金
Projects(52278439, 51908073, 51838001, 52078066) supported by the National Natural Science Foundation of China
Project(21B0317) supported by the Hunan Province Education Department, China
Project(KFJ170302) supported by the Key Laboratory of Road Structure and Material Transportation Industry, Changsha University of Science & Technology, China
Project(CX20220892) supported by the Postgraduate Research Innovation of Hunan Province, China。
关键词
炭质泥岩
低碳钢锚杆
腐蚀特性
电化学测试
腐蚀速率
carbonaceous mudstone
low-carbon steel anchor bolt
corrosion characteristics
electrochemical test
corrosion rate
