Naslov
The influence of temperature on dielectric loss in organic coatings

Autori
Babić, Ranko ; Metikoš-Huković, Mirjana ; Omanović, Saša

Izvornik
Progress in organic coatings (0300-9440) 23 (1994), 3; 265-274

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
steel; coal tar epoxy; dielectric properties; impedance spectroscopy

Sažetak
The dielectric properties of a coal tar epoxy coating, sandwiched between a steel and a brass plate, were investigated by means of impedance spectroscopy in the frequency range 5 to 105 Hz and the temperature range −20 to +100 °C. At lower temperatures (−20 to +20 °C) the coating response is almost purely capacitive. At higher temperatures, resistive behaviour becomes evident. A relaxation covers more than two frequency ranges (100 Hz-30 kHz) for temperatures between 60 and 100 °C. A master curve, independent of temperature, of the lost characteristic and dielectric relaxation is described by an empirical impedance expression. The coating resistance, as a function of temperature, showed an Arrhenius type dependence with an activation energy of conductivity of approximately 148 kJ mol−1. In the upper temperature range and at frequencies below 100 Hz another time constant was observed: it also showed an Arrhenius type dependence on temperature with an energy of activation of 121.8 kJ mol−1.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA