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Evaluation of Inorganic Zinc-Rich Primers (ZRP's) Using Electrochemical Impedance Spectroscopy (EIS) in Combination With Atmospheric Exposure

April 1995

By: Louis MacDowell & Luz Calle

Abstract

This investigation explored the use of EIS in combination with atmospheric exposure at the KSC Beach Corrosion Test Site near the Space Shuttle launch complex as a short-term method for analyzing the performance of twenty-one commercially available ZRP's. EIS measurements were collected after different times of atmospheric exposure and analyzed by finding an equivalent circuit to simulate the data. This analysis yielded several parameters indicative of physical and chemical behavior for the new and aged primer films. These parameters were analyzed and summarized to help categorize the behavior of each material. A correlation was found between the long-term performance of ZRP's and several parameters from the EIS measurements; work will continue to refine the evaluation process and improve the prediction capability of this technique.

For additional information, a complete copy of this study is available as NASA Report 94-2082.  Send requests for copies to corrosion@ksc.nasa.gov.

To download a full copy of this report in Adobe's pdf format for local printing, click 94-2082.pdf.  (2.9MB)

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