A Novel Linear Polarization Resistance Corrosion Sensing Methodology for Aircraft Structure



Douglas W. Brown Richard J. Connolly Margaret Garvan Honglei Li Vinod S. Agarwala George Vachtsevanos


A direct method of measuring corrosion on a structure using a micro-linear polarization resistance (μLPR) sensor is presented. The new three-electrode μLPR sensor design presented in this paper improves on existing LPR sensor technology by using the structure as part of the sensor system, allowing the sensor electrodes to be made from a corrosion resistant or inert metal. This is in contrast to a two- electrode μLPR sensor where the electrodes are made from the same material as the structure. A controlled experiment, conducted using an ASTM B117 salt fog, demonstrated the three-electrode μLPR sensors have a longer lifetime and better performance when compared to the two-electrode μLPR sensors. Following this evaluation, a controlled experiment using the ASTM G85 Annex 5 standard was performed to evaluate the accuracy and precision of the three-electrode μLPR sensor when placed between lap joint specimens made from AA7075-T6. The corrosion computed from the μLPR sensors agreed with the coupon mass loss to within a 95% confidence interval. Following the experiment, the surface morphology of each lap joint was determined using laser microscopy and stylus-based profilometry to obtain local and global surface images of the test panels. Image processing, feature extraction, and selection tools were then employed to identify the corrosion mechanism (e.g. pitting, intergranular).

How to Cite

W. Brown, D. ., J. Connolly, R. ., Garvan, M. ., Li, H. ., S. Agarwala, V. ., & Vachtsevanos, G. . (2014). A Novel Linear Polarization Resistance Corrosion Sensing Methodology for Aircraft Structure. Annual Conference of the PHM Society, 6(1). https://doi.org/10.36001/phmconf.2014.v6i1.2420
Abstract 56 | PDF Downloads 20



corrosion, failure analysis, sensors, structural health management, microstructure, fault diagnostics

Bockris, J. O., Reddy, A. K. N., & Gambola-Aldeco, M. (2000). Modern electrochemistry 2a. fundamentals of electrodics (2nd ed.). New York: Kluwer Academic/Plenum Publishers.

Buchheit, R. G., Hinkebein, T., Maestas, L., & Montes, L. (1998, March 22-27). Corrosion monitoring of concrete-lined brine service pipelines using ac and dc electrochemical methods. In Corrosion 98. San Diego, Ca.

Burstein, G. T. (2005, December). A century of tafel’s equation: 1905-2005. Corrosion Science, 47(12), 2858- 2870.

G102, A. S. (1994). Standard practice for calculation of corrosion rates and related information from electrochemical measurements. Annual Book of ASTM Standards, 03.02.

G59, A. S. (1994). Standard practice for conducting potentio- dynamic polarization resistance measurements. Annual Book of ASTM Standards, 03.02.
Harris, S. J., Mishon, M., & Hebbron, M. (2006, October). Corrosion sensors to reduce aircraft maintenance. In Rto avt-144 workshop on enhanced aircraft platform availability through advanced maintenance concepts and technologies. Vilnius, Lithuania.

Herder, P., & Wijnia, Y. (2011). Asset management: The state of the art in europe from a life cycle perspective (T. van der Lei, Ed.). Springer.

Huston, D. (2010). Structural sensing, health monitoring, and performance evaluation (B. Jones & W. B. S. J. Jnr., Eds.). Taylor and Francis.
Introduction to corrosion monitoring. (2012, August 20). Online. Available from http://www.alspi.com/introduction.htm

Kossowsky, R. (1989). Surface modification engineering (Vol. 1). Boca Raton, Florida: CRC Press, Inc.

Twomey, M. (1997). Inspection techniques for detecting corrosion under insulation. Material Evaluation, 55(2), 129-133.

Wagner, C., & Traud, W. (1938). Elektrochem, 44, 391.
Technical Papers

Most read articles by the same author(s)

1 2 > >>