Laboratory of Buildings Durability and Rehabilitation, Campus Russas, Federal University of Ceara, Russas 62900-000, Brazil.
I3N & Department of Physics, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
Sensors (Basel). 2022 Aug 9;22(16):5947. doi: 10.3390/s22165947.
As corrosion has slow development, its detection at an early age could be an alternative for reducing costs of structural rehabilitation. Therefore, the employment of structural health monitoring (SHM) systems, sensing configurations collecting data over time allowing for observing changes in the properties of the materials and damage emergence, for monitoring corrosion can be a good strategy to measure the damage and to decide the better moment for intervention. Nonetheless, the current corrosion sensor technology and the high costs of the sensing system implementation are limiting this application in the field. In this work, an optical fiber Bragg grating (FBG)-based sensing system is proposed for monitoring the thickness loss of a 1020 carbon steel metal plate subjected to controlled corrosion. The natural frequency of the plate was collected as a function of the corrosion time over 3744 h. To validate the experimental results, ultrasound measures and electrochemical tests were also carried out under similar conditions. The experimental results show adequate reliability, indicating the suitable functionality of the proposed system for monitoring the thickness loss caused by corrosion in metallic structures, in comparison with traditional methods, as ultrasonic and electrochemical measures.
由于腐蚀的发展缓慢，因此早期发现腐蚀可能是降低结构修复成本的一种选择。因此，采用结构健康监测 (SHM) 系统，通过传感器配置收集随时间变化的数据，从而观察材料性能的变化和损伤的出现，用于监测腐蚀，可以是测量损伤和决定干预最佳时机的一种有效策略。尽管如此，当前的腐蚀传感器技术和传感系统实施的高成本限制了该技术在现场的应用。在这项工作中，提出了一种基于光纤布拉格光栅 (FBG) 的传感系统，用于监测经过受控腐蚀的 1020 碳钢金属板的厚度损失。作为腐蚀时间的函数，收集了板的固有频率，腐蚀时间超过 3744 小时。为了验证实验结果，还在相似条件下进行了超声测量和电化学测试。实验结果表明，该系统具有足够的可靠性，与传统方法（如超声和电化学测量）相比，表明该系统适用于监测金属结构因腐蚀引起的厚度损失，具有合适的功能。
