Epoxy coal-tar system

The electrical properties of a series of eight different tank coating systems in contact with respectively seawater, crude oil and kerosine were determined [2], as a part of a tank coatings research program. The results measured for one of these coatings, an epoxy coal-tar system cured with an amine adduct (26 %wt. binder, 35 %wt. coal-tar and 39 %wt. talc/ barytes pigments) are reported in this chapter. 

The electrical properties of this epoxy coal-tar system hardly changed due to contact with Middle Bast (Kuwait) crude oil ... 

Equation 5.28 results in a relaxation time of about 50 seconds for the epoxy coal-tar coating as such. This value decreases to about 0.2 seconds after contact of the coating with seawater. The relaxation time of the epoxy coal-tar system remains higher than the relaxation times of 0.018 s. to 0.00018 reported for different crude oils [28], even after prolonged contact with seawater. 

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