Simultaneous monitoring of the corrosion activity and moisture inside aircraft lap joints

Kevin R. Cooper; Yupei Ma; John P. Wikswo; Robert G. Kelly

doi:10.1117/12.539865

29 July 2004 Simultaneous monitoring of the corrosion activity and moisture inside aircraft lap joints

Kevin R. Cooper, Yupei Ma, John P. Wikswo, Robert G. Kelly

Proceedings Volume 5391, Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems; (2004) https://doi.org/10.1117/12.539865
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

Abstract

Measurement of the moisture and corrosion rate within occluded regions is difficult because of their inherent restricted access. The objective of this work was to simultaneously measure in situ the ingress and egress of water and the corrosion activity within simulated aircraft lap joints. Fiber optic moisture sensors monitored the presence of the aggressive aqueous environment within pristine and corroded joints whereas the relative corrosion rate inside the joint was monitored using a SQUID magnetometer, which measures the magnetic fields associated with the small electrical currents produced from the corrosion reactions. Water ingress was very rapid (~ 1 mm/min) whereas egress was much slower (< 0.01 mm/min) and spatially non-uniform. Corroded joints dried slower than pristine joints due to the finely porous, hydroscopic nature of the corrosion products. Corrosion activity correlated with moisture in a complex manner. Wetting caused a substantial increase in corrosion activity within the joint in comparison to the dry baseline condition. During drying, a transient increase prior to cessation in corrosion activity occurred due to concentration and increase in aggressiveness of the solution within the joint. This work highlights the efficacy of simultaneously monitoring moisture and the corrosion activity within occluded regions by employing small profile fiber optic sensors and SQUID technique.

Citation Download Citation

Kevin R. Cooper, Yupei Ma, John P. Wikswo, and Robert G. Kelly "Simultaneous monitoring of the corrosion activity and moisture inside aircraft lap joints", Proc. SPIE 5391, Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, (29 July 2004); https://doi.org/10.1117/12.539865

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KEYWORDS

Corrosion

Sensors

Magnetism

Mouth

Fiber optics sensors

Water

Magnetic sensors

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