Durable Hybrid Coatings
Abstract
A new in situ corrosion sensor electrode was designed, fabricated, and tested. The new sensor was shown in performance testing to be robust, flexible, reproducible, and adaptable to various field applications. The shape and size of the sensor could be easily changed by creating the appropriate shadow mask for metal deposition. Sensors were embedded between a Mg-rich primer, developed earlier with support from this project, and the topcoat. Coated substrates with embedded sensors were then placed into a standardized Prohesion chamber to simulate weathering conditions in an aggressive manner to induce accelerated coating failure. It was demonstrated that the embedded sensors enabled continuous monitoring of degradation of the coating system with Prohesion exposure time, through a gradual decrease in both the low frequency impedance |Z|0.05 Hz and noise resistance. Further, the 2-electode sensor-sensor electrochemical impedance data agreed well with the data obtained from the conventional 3-electrode setup performed in a laboratory environment, thus demonstrating the feasibility of this 2 sensor electrode approach without the need of additional reference or counter electrodes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2011
- Accession Number
- ADA547633
Entities
People
- Dante Battocchi
- Gordon P. Bierwagen
- Larry R. Pederson
- Vsevold Balbyshev
Organizations
- North Dakota State University