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Portable, Non-destructive, Surface/Coating Integrity Verification

Hydrogel-based EIS measurement using off-the-shelf, portable field devices to asses integrity/degradation of protective coatings


Coating integrity is typically measured in a lab using a procedure requiring removal of some of the coating material and then measurement of impedance via liquid electrolyte in glass cells that are clamped onto flat metal coupons. This method is time‑intensive, has a time lag due to the need for a full lab, and requires taking a sample of the surface material.

To better serve the needs of the industry, this new method of measuring surface impedance allows for field testing using portable, widely available standard equipment without the need to extract a sample. The use of electrostatic gel pads as the measurement device allows for curved and delicate surfaces to be tested. After establishing a baseline when a

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