Development of a Thin and Flexible Sensor for Assessing Corrosion Damage of Hard-to-Access Painted Surfaces
The three electrode sensor used for these measurements consist of Ag/AgCl ink screen printed on thin flexible polymer substrate material. This ink and substrate combination has allowed the sensor to function for 600+ hours without failure. To make the electrical connection, wires were bonded to the sensor through a silver conductive epoxy. To keep this bonded area from corroding and giving false readings it was sealed with a waterproof, self-fusing silicon wrap. The preliminary results of EIS measurements (Figure 1) of painted steel panel with sensor (blue) and conventional paint cell (red) show an excellent agreement between these spectra.