Simulation of wet-dry cycling of organic coatings using ionic liquids

K. N. Allahar, B. Hinderliter, A. M. Simoes, D. Tallman, G. P. Bierwagen, S. G. Croll

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The diffusion coefficient of water An associated with the ingress in an organic coating is an indicator of the rate at which the coating absorbs water. Likewise, the diffusion coefficient associated with water egress Dout is an indicator of the drying rate of the coating. The measurement of D in by gravimetric and capacitance methods have been reported, and so to Dout by gravimetry. Reported recently was a method that employed a hydrophilic room temperature ionic liquid to monitor the capacitance changes associated with the egress of water from which Dout was calculated. Experimental results associated with cyclic dilute NaCl wetting and ionic liquid drying are presented for an epoxy coating on an AA 2024-T3 substrate. The Din and Dout values were calculated using a short-time approximate solution and a series solution to Fick's second law. Electrochemical impedance spectra associated with the ends of wet and dry stages of the cycles are presented. Copyright The Electrochemical Society.

Original languageEnglish (US)
Title of host publicationPhysical and Analytical Electrochemistry (General)
Pages31-48
Number of pages18
Edition14
DOIs
StatePublished - Dec 1 2007
Event209th ECS Meeting - Denver, CO, United States
Duration: May 7 2006May 12 2006

Publication series

NameECS Transactions
Number14
Volume2
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other209th ECS Meeting
CountryUnited States
CityDenver, CO
Period5/7/065/12/06

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