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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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Revisiting Alloy K-500 with Improved Performance Limits for Short and Long-Term Subterranean Applications

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Field Testing of Self-Healing Metallic Coatings for Internal Corrosion Protection of Natural Gas Pipelines

Product Number: 51323-18857-SG
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Natural gas pipelines are subject to internal corrosion. Internal corrosion of steel pipelines can cause natural gas leakage, leading to wasted energy, explosion hazards, and methane emissions. The U.S. Department of Transport reported numerous case histories of corrosion problems and failures in wet gas pipelines. The National Energy Technology Laboratory (NETL) performed an incident survey from 2010 through 2018 and found that 112 (12%) of these incidents in the U.S. transmission lines were caused by internal corrosion.
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Product Number: 51323-18877-SG
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