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Predictive Coating Condition Model For Coating Lifetime Under Environmental Stressors

Picture for Predictive Coating Condition Model For Coating Lifetime Under Environmental Stressors
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The corrosion of aircraft costs the U.S. Department of Defense billions of dollars annually and accounts for a significant portion of maintenance time and costs.1 Coatings are the most effective way to protect aircraft, but they have a finite lifetime and must be maintained or replaced before the underlying substrate is damaged by corrosion. Current aircraft maintenance practices call for coating inspections and maintenance based on elapsed time and not on measurements of coating health. Coating lifetime varies depending on the environmental stressors experienced in service, including temperature, humidity, and salt loading.

Product Number: 51322-17685-SG
Author: Victoria Avance, Brandi Clark, Liam Agnew, Fritz Friedersdorf
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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In this work, laboratory test methodologies that employ the combined environmental stressors of time of wetness and salt loading were used to excite corrosion failure modes of coating systems. Real-time measurements via interdigitated electrodes were correlated with reference panel images to monitor the evolution of coating damage. These data can give insights into the coating degradation process and can be used as parameters for developing a predictive coating condition model. A description of the sensors, electrochemical measurements, and methods for coating testing are reported along with the results of atmospheric tests using a range of conditions to produce coating degradation.

In this work, laboratory test methodologies that employ the combined environmental stressors of time of wetness and salt loading were used to excite corrosion failure modes of coating systems. Real-time measurements via interdigitated electrodes were correlated with reference panel images to monitor the evolution of coating damage. These data can give insights into the coating degradation process and can be used as parameters for developing a predictive coating condition model. A description of the sensors, electrochemical measurements, and methods for coating testing are reported along with the results of atmospheric tests using a range of conditions to produce coating degradation.

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