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Comparative study of residual stresses generated in an epoxy coating on carbon steel and stainless steel after thermal aging

Picture for Comparative study of residual stresses generated in an epoxy coating on carbon steel and stainless steel after thermal aging
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Corrosion under insulation (CUI) is a widespread corrosion phenomenon in many industries since it was first described in 1965. CUI generally occurs when moisture is retained within thermal insulation and metal interface and when the protective coating breaks down. Improper installation and eventual damage to metal jacketing act as an entry point for water. The rate of CUI can be further accelerated depending on the amount of leached corrosive species and the operating parameters.

Product Number: 51323-19102-SG
Author: Janice Xin Yee, Ng, Hanan Farhat, Thunyaluk Pojtanabuntoeng, Arun Mathew, Qing Cao, Mariano Iannuzzi
Publication Date: 2023
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$20.00
$20.00

Corrosion under insulation (CUI) is a common phenomenon caused by ingressed water and corrosive species on insulated metal piping and equipment. The severity of CUI is strongly influenced by process parameters such as temperature, types of insulation, types, and concentration of contaminants in the ingressed moisture. The primary mitigation strategy of CUI is the application of protecting coatings. However, protective coatings may still degrade over time due to numerous factors including the development of thermal stresses induced by the thermal expansion coefficients mismatch between coating and underlying substrates, which could ultimately lead to coating failures such as cracks or delamination depending on the generated stress states. This study has conducted a numerical analysis of thermal stresses generated in a commercial epoxy coating deposited on carbon steel and stainless-steel substrates with Finite Element Analysis using ANSYS. Thermomechanical properties of thermally aged coatings were obtained after continuous exposure to 150 °C for 8 weeks. The acquired residual stresses of coatings were further cross-examined with the coating’s protective and adhesive properties through electrochemical impedance spectroscopy and pull-off adhesion tests, respectively.

Corrosion under insulation (CUI) is a common phenomenon caused by ingressed water and corrosive species on insulated metal piping and equipment. The severity of CUI is strongly influenced by process parameters such as temperature, types of insulation, types, and concentration of contaminants in the ingressed moisture. The primary mitigation strategy of CUI is the application of protecting coatings. However, protective coatings may still degrade over time due to numerous factors including the development of thermal stresses induced by the thermal expansion coefficients mismatch between coating and underlying substrates, which could ultimately lead to coating failures such as cracks or delamination depending on the generated stress states. This study has conducted a numerical analysis of thermal stresses generated in a commercial epoxy coating deposited on carbon steel and stainless-steel substrates with Finite Element Analysis using ANSYS. Thermomechanical properties of thermally aged coatings were obtained after continuous exposure to 150 °C for 8 weeks. The acquired residual stresses of coatings were further cross-examined with the coating’s protective and adhesive properties through electrochemical impedance spectroscopy and pull-off adhesion tests, respectively.

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

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Product Number: 51323-18857-SG
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