An electromechanical impedance-instrumented corrosion-measuring probe

Abstract

Corrosion of metallic structures widely existed in multiple industries, such as oil and gas, civil infrastructure, aerospace, mechanical, mining, and processing. Current available corrosion-monitoring methods are based on different sensing principles, which have their own advantages, and some drawbacks that may limit their application on some aspects. This article presents an electromechanical impedance-instrumented corrosion-measuring probe for corrosion monitoring. The proposed probe is fabricated by attaching a circular lead zirconate titanate patch onto a metal rod. Compared to other electromechanical impedance-based corrosion-monitoring methods, the probe is capable of isolating the influence of structural complexity, variations in loading and boundary conditions. Five probes were fabricated in the experimental study and three of them were subjected to accelerated corrosion tests to mimic the corrosion-induced mass loss damage. Results showed that the peak magnitude of the conductance signatures was reduced with the increase in corrosion amount. The variations in the conductance signatures were quantified by three statistical quantifying metrics, that is, root-mean-square deviation, mean absolute percentage deviation, and correlation coefficient deviation. All these metrics increase with the increase in corrosion amount, which can be used as an indicator of the corrosion process. This study proves that the proposed corrosion-measuring probe is effective in monitoring corrosion and shows promising application potential. This research also serves as a proof-of-concept study to demonstrate the capability of the electromechanical impedance technique in monitoring mass loss due to corrosion.

Monitoring of bolt looseness using piezoelectric transducers: Three-dimensional numerical modeling with experimental verification

“…Compared to current methods of detecting bolt looseness in industries, such as the vision method (Huynh et al, 2019; Lei et al, 2018; Wang et al, 2019a) and percussion approach (Kong et al, 2018; Wang et al, 2019b), the emerging structural health monitoring (SHM) approaches (Annamdas et al, 2017; Kuok and Yuen, 2019; Li et al, 2019a; Pan et al, 2019) that employ integrated sensors (Chen et al, 2018; Liao and Chiu, 2019; Xu et al, 2019) have attracted much attention since they have capacity to implement online or real time monitoring (Feng et al, 2018; Mańka et al, 2016; Wang et al, 2018a). Among the sensors used in SHM, piezoelectric transducers have received much attention because of its wide bandwidth (Kong et al, 2017a; Lu et al, 2018; Xu et al, 2018), energy harvesting (Brenes et al, 2019; Park et al, 2008; Wang, 2013; Wang and Shen, 2019), and dual sensing and actuation functions, which enable piezoelectric transducers’ ability to generate and detecting stress waves (Dziendzikowski et al, 2018; Huo et al, 2017a; Kong et al, 2017b; Li et al, 2019b). Stress wave–enabled methods have been widely used in SHM (Fan et al, 2016; Jung and Park, 2018; Wang et al, 2009; Wang and Hao, 2014; Zhang et al, 2018).…”

An EMI-Based Clustering for Structural Health Monitoring of NSM FRP Strengthening Systems

“…Additionally, PZT transducers excite the host structure within a high frequency range which makes EMI technique very attractive for local damage detection because of its sensitivity to even small damage [25,26,27,28,29,30,31,32,33]. However, it should be considered that ambient variations will also alter the impedance signal.…”

Localization and monitoring of initiation and propagation of corrosion-induced mortar cracking based on OFDR distributed optical fiber sensor

“…This technique was also combined with AE to monitor steel corrosion in concrete (Sharma et al, 2018). Piezoceramic transducers such as the lead zirconatetitanate (PZT) patches were bonded onto or embedded into the host structures to monitor corrosion in prestressed concrete (Li et al, 2019a;Jiang et al, 2017;Song et al, 2007;Talakokula et al, 2013Talakokula et al, , 2014. Corrosion-induced concrete cover cracking was also investigated by using a digital caliper that measured the distance of a pair of fixed reference points along the concrete surface (Pedrosa et al, 2017).…”