Combinatorial Materials Research Applied to the Development of New Surface Coatings X: A High-Throughput Electrochemical Impedance Spectroscopy Method for Screening Organic Coatings for Corrosion Inhibition
By He, Jie; Bahr, James; Chisholm, Bret J.; Li, Jun; Chen, Zhigang; Balbyshev, Séva N.; Bonitz, Verena & Bierwagen, Gordon P.
Published in Journal of Combinatorial Chemistry
2008
Abstract
The objective of the study was to develop a high-throughput electrochemical impedance spectroscopy (HT-EIS) method for rapid and quantitative evaluation of corrosion protective coatings. A 12-element, spatially addressable electrochemical platform was designed, fabricated, and validated. This platform was interfaced to a commercial EIS instrument through an automated electronic switching unit. The HT-EIS system enables four parallel EIS measurements to be run simultaneously, which significantly reduces characterization time compared to that of serial EIS measurements using a multiplexer. The performance of the HT-EIS system was validated using a series of model systems, including a Randles equivalent circuit, an electrochemical reaction (Ti/K4FeCN6, K3FeCN6), a highly uniform polymer film, and several polymer coatings. The results of the validation studies showed that the HT-EIS system enables a major reduction in characterization time and provides high quality data comparable to data obtained with conventional, single-cell EIS measurement systems.