Unclassified 



Sccvmlv Classification 



DOCUMENT CONTROL DATA -R&D 



I »ic uveral/ ripori is riassiliedj 



Naval Civil Engineering Laboratory 

 Port Hueneme, Calif. 93041 



Unclassified 



RELATION BETWEEN CHANGES IN ELECTRICAL PROPERTIES AND PERFORMANCE 

 OF COATINGS — Experiments With Thirteen Immersed Coating Systems 



RIPTIVE NOTES (Typf ol report and Irtclutlvn d. 



Not final; June 1967- June 1969 



Peter J. Hearst 



May 1970 



48 



17 



YF 51.543.006.01.006 



TR-683 



NO<S) (Any other numb«ra that may bo assign 



This document has been approved for public release and sale; its distribution is unlimited. 



Naval Facilities Engineering Command 

 Washington, D. C. 20390 



in an attempt to find a relatively rapid method of predicting the performance 

 of coatings, changes in electrical properties were compared with the results of long-term 

 field performance of the coatings. Thirteen coating systems on steel panels were immersed 

 in seawater in the laboratory for 400 days, and the AC and DC electrical properties of the 

 coatings were determined. Earlier experiments had indicated a relationship between 

 changes in electrical properties and performance. New results with coatings of comparatively 

 good performance indicate some correlation between changes in electrical properties and 

 coating performance. However, the correlation is not sufficiently high to allow reliable 

 prediction of the comparative performance of good coatings. 



DD ,?o?es1473 'p*'^^ " 



S/N 0101-607-6801 



llnrla<:<:ifipH 



