Radio Frequency Identification (RFID) Based Corrosion Monitoring Sensors. Part 2: Application and Testing of the Coating Materials
DRDC Atlantic Research Centre - Dockyard Laboratory Pacific Victoria, BC Canada
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Cost-effective Radio Frequency Identification RFID transponders tags were investigated for wireless corrosion monitoring by applying a metal-filled conductive composite coating onto the surface of the plastic tags. The coating acted as an electromagnetic interference EMI shield by attenuating or completely blocking the radio-frequency signals transmitted between the transceiver reader and the tag. When the coated RFID tag was exposed to a corrosive environment through accelerated corrosion tests or marine atmospheric tests, the degradation of the coating decreased the EMI shielding effectiveness and resulted in a strengthened communication between the reader and the tag. By establishing a correlation between the corrosion rate of the metal object to be monitored and the sensor responding performance, it was possible to monitor cumulative corrosion damage via wireless sensor reading.