Abstract
Submerged steel pipes are susceptible to corrosion due to long exposure under harsh corrosive conditions. Here, we investigated the reliability and effectiveness of nonwoven zinc(II) oxide-polyvinylidene fluoride (ZnO-PVDF) nanocomposite fiber textiles as an embedded corrosion sensor. An accelerated thermal cyclic method paired to electrochemical impedance spectroscopy (EIS) was used for this purpose. Sensor accuracy and reliability were determined using the textile and instrument as reference electrodes. The results showed that the coating and the sensor improved the corrosion resistance when ZnO was added to the sensor textile and introduced into the coating. As the coating’s glass transition was approached, the corrosion performance of the coating degraded and the sensor accuracy decreased. The results suggested that the flexible sensor is reliable at both monitoring the corrosion and acting as a corrosion barrier.
Highlights
Metals have a tendency to corrode on exposure to the environment especially where there is high moisture content
Organic coatings serve as a barrier between the metal substrate and the surrounding environment to reduce the transport of moisture, water, and ionic species to the metal substrate [1]
We have shown that a nonconductive ZnO-PVDF nanocomposite nonwoven textile, fabricated from the electrospinning method, could be used as an embedded sensor to sense corrosion under the organic coating after it was immersed into a sea salt solution [12]
Summary
Metals have a tendency to corrode on exposure to the environment especially where there is high moisture content. We have shown that a nonconductive ZnO-PVDF nanocomposite nonwoven textile, fabricated from the electrospinning method, could be used as an embedded sensor to sense corrosion under the organic coating after it was immersed into a sea salt solution [12]. In response to the need to develop an accurate and accelerated test, a thermal cycling approach emerged In this method, the coated panels are subjected to cyclic temperature changes under constant immersion. EIS testing was carried out for the textile as a stand-alone system, as well as embedded at the metal–coating interface to evaluate the performance of a standard epoxy coating, along with the sensor’s capability of sensing corrosion when exposed to the thermal cycling method. The temperature dependence of the barrier properties of the coating, along with its activation energy as a function of ZnO, were calculated by examining the reversibility of impedance data
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