Optical sensors for corrosion detection in airframes

Venâncio, P. G.; Cottis, R.A.; Narayanaswamy, Ramaier; Fernandes, Jorge Cruz

doi:10.1016/j.snb.2013.03.059

Cited by 14 publications

(8 citation statements)

References 32 publications

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“…Examples of conventional direct measurement techniques include corrosion coupons, electrical resistance (ER) probes [ 10 ], and linear polarization resistance (LPR) probes [ 11 ]. Indirect corrosion measurement technologies based on fiber-optic sensors monitor various factors that affect the rate of corrosion processes (pH [ 12 , 13 , 14 ], humidity [ 15 , 16 , 17 , 18 , 19 ], temperature [ 17 , 20 ], concentrations of certain chemical species [ 21 , 22 , 23 , 24 , 25 ]), or their consequences, such as the presence of corrosion products [ 26 ], a reduction in wall thickness [ 27 ], changes in hoop strain [ 28 , 29 , 30 ], or leaks that occurred due to the loss of integrity [ 20 , 31 ]. The sensor described in this work falls into the category of indirect measurements because it does not provide the actual rate of external corrosion on the pipe wall in real-time.…”

Section: Literature Reviewmentioning

confidence: 99%

Cost-Effective Corrosion Detection Sensor for Above-Ground Oil and Gas Flowlines

Vahdati

Shiryayev

Parapurath

et al. 2022

Sensors

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A sensor for monitoring of the external corrosion of small-diameter aboveground oil and gas pipelines (called flowlines), based on fiber-optic strain sensing, is proposed. The working principle of our proposed sensor relies on the use of a pre-stressed sacrificial structure made of the same material as the pipeline and monitoring changes in the measured strain that occur due to deterioration caused by corrosion to the structure. We present the development of analytical equations that allow designing the sensor structure to achieve the desired strain values. The analysis was verified using commercial finite element analysis (FEA) software. The proposed sensor is simple and cost-effective and can be easily manufactured. It can be deployed on existing overground pipelines without any modification to the pipeline structure. While it is not capable of measuring the corrosion rate continuously, it can provide a measurement of the average corrosion rate over the life span of its sacrificial metal structure.

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Section: Literature Reviewmentioning

confidence: 99%

Cost-Effective Corrosion Detection Sensor for Above-Ground Oil and Gas Flowlines

Vahdati

Shiryayev

Parapurath

et al. 2022

Sensors

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“…[86], using both 8-HQ and MNIP (molecularly non-imprinted polymer), which is a polymer with a chemical affinity for the ions without the need of being previously synthesized in the presence of the mentioned ion. [86], using both 8-HQ and MNIP (molecularly non-imprinted polymer), which is a polymer with a chemical affinity for the ions without the need of being previously synthesized in the presence of the mentioned ion.…”

Section: Detection Of Corrosion By-productsmentioning

confidence: 99%

Optical Sensors for Corrosion Monitoring

Zamarreño

Rivero

Hernáez

et al. 2015

Intelligent Coatings for Corrosion Control

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“…Several research can be found in civil engineering for corrosion monitoring of reinforced concrete, where e.g., the formation of corrosion products causes measurable changes in strain, temperature or the refractive index of fiber optic sensors [12]. But fiber optic techniques have also been tested for aircrafts [13,14], e.g., by using fluorescent fiber optic sensors that detect aluminum ions from early stages of corrosion. Besides the already mentioned methods also acoustic methods are of big importance in corrosion monitoring.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Monitoring of Atmospheric Corrosion on Aluminum Aircraft Structures at Varying Relative Humidity

Erlinger¹,

Kralovec²,

Schagerl³

2022

Preprint

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Atmospheric corrosion of aluminum aircraft structures occurs due to numerous reasons. A typical phenomenon leading to corrosion is the deliquescence of contaminants such as salts due to changes in relative humidity (RH) caused by aircraft operation at different altitudes and climate zones. Currently, corrosion of aircrafts is controlled by scheduled inspections. In contrast, the present contribution aims for a continuous monitoring approach by using the acoustic emission (AE) method to detect and further evaluate atmospheric corrosion. The AE method is frequently used for corrosion detection at typically immersion-like conditions or for corrosion types where stress-induced cracking is involved. However, it has not yet been demonstrated for atmospheric corrosion at unloaded aluminum structures. To address this question, the present investigation uses small droplets of a corrosive sodium chloride (NaCl) solution to induce atmospheric corrosion on aluminum alloy AA2024-T351. Operating conditions of an aircraft are simulated by a controlled variation in RH. In addition, videos of the corrosion site are recorded to visually observe the corrosion process. Pitting corrosion is generated and clearly measurable AE signals are detected. An automatic video processing algorithm looking for sudden changes on the corrosion site mainly detects hydrogen bubbles formed when aluminum reacts with aqueous solutions. A clear correlation between the observed pitting corrosion, the AE and the hydrogen bubble activity and the RH, i.e., the electrolyte present at the aluminum surface, is found. Thus, the findings demonstrate the applicability of the AE method for monitoring atmospheric corrosion of aluminum aircraft structures by today’s measurement equipment. Numerous potential effects that can cause measurable AE signals are investigated and discussed. Among these, bubble activity is clearly considered to be the most emissive one.

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Optical sensors for corrosion detection in airframes

Cited by 14 publications

References 32 publications

Cost-Effective Corrosion Detection Sensor for Above-Ground Oil and Gas Flowlines

Cost-Effective Corrosion Detection Sensor for Above-Ground Oil and Gas Flowlines

Optical Sensors for Corrosion Monitoring

Acoustic Emission Monitoring of Atmospheric Corrosion on Aluminum Aircraft Structures at Varying Relative Humidity

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