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Laboratory Investigation Of Coating Impedance In Controlled Environments Using A Two-Cell Field Test Method

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The recent development of ASTM D8370-22 provides a field-applicable technique for measuring impedance on protective coatings. The test method expands the use of electrochemical impedance spectroscopy (EIS) beyond the laboratory and standardizes the approach for various applications to polymeric coatings on conductive substrates, e.g., barrier coatings on steel structures. Example applications include condition assessments and quality control testing.

Product Number: 51323-19155-SG
Author: Bobbi Jo Merten, Meredith Heilig, Matt Jermyn
Publication Date: 2023
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This research evaluates laboratory data collected in an environmental chamber using the new ASTM D8370 Field Measurement of Electrochemical Impedance on Coatings and Linings test method. The study simulates field testing conditions by placing the field potentiostat and sample within controlled environments, such as an environmental chamber. The experiments controlled for relative humidity (RH) and temperature independently across 14% RH to 100% RH and 35 F (2 C) to 115 F (46 C), respectively, to evaluate the effect of environment on impedance data. The coating systems evaluated were solvent-borne epoxy, 100% solids epoxy, polysulfide-modified epoxy, and solution vinyl. The results showed the strongest effect for temperature, with each coating type exhibiting impedance values changing inversely with temperature.

This research evaluates laboratory data collected in an environmental chamber using the new ASTM D8370 Field Measurement of Electrochemical Impedance on Coatings and Linings test method. The study simulates field testing conditions by placing the field potentiostat and sample within controlled environments, such as an environmental chamber. The experiments controlled for relative humidity (RH) and temperature independently across 14% RH to 100% RH and 35 F (2 C) to 115 F (46 C), respectively, to evaluate the effect of environment on impedance data. The coating systems evaluated were solvent-borne epoxy, 100% solids epoxy, polysulfide-modified epoxy, and solution vinyl. The results showed the strongest effect for temperature, with each coating type exhibiting impedance values changing inversely with temperature.

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