Effects of accelerated weathering and hygrothermal ageing on the thermomechanical properties and residual stresses of epoxy amine coatings

Janice Xin Yee Ng; Nicholas Sheng Loong Tan; Vladimir Golovanevskiy; Hanan Farhat; Thunyaluk Pojtanabuntoeng

doi:10.1016/j.porgcoat.2025.109126

Effects of accelerated weathering and hygrothermal ageing on the thermomechanical properties and residual stresses of epoxy amine coatings

Janice Xin Yee Ng^*
, Nicholas Sheng Loong Tan
, Vladimir Golovanevskiy
, Hanan Farhat
, Thunyaluk Pojtanabuntoeng

^*Corresponding author for this work

QEERI - Corrosion Center

Curtin University

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The effect of artificial weathering and/or hygrothermal ageing on the thermomechanical properties of epoxy amine coating and the subsequent effect on the residual stresses (thermal and hygroscopic stresses) was investigated. Variations in the thermomechanical properties of coatings after artificial weathering and/or hygrothermal ageing, in comparison to fresh samples, were evaluated through various analyses. Feasibility of the determination of coefficient of hygroscopic expansion (α^H_F) from the slope of the plot of polynomial-fitted hygroscopic strain (ϵ_hygro) and moisture concentration at saturation (C_sat) was also assessed. Residual stresses of 229 MPa and 334 MPa were calculated based on experimentally determined properties. These stresses were found to exceed the compressive strength of the coatings, which explains the delamination observed in peel-off adhesion tests.

Original language	English
Article number	109126
Journal	Progress in Organic Coatings
Volume	201
DOIs	https://doi.org/10.1016/j.porgcoat.2025.109126
Publication status	Published - 6 Feb 2025

Keywords

Accelerated weathering
CUI
Corrosion under insulation
Epoxy
Hygroscopic expansion coefficient
Hygroscopic strain
Organic coatings
Residual stresses, hygrothermal stresses
Thermal ageing
Thermomechanical properties
UV

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10.1016/j.porgcoat.2025.109126

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title = "Effects of accelerated weathering and hygrothermal ageing on the thermomechanical properties and residual stresses of epoxy amine coatings",

abstract = "The effect of artificial weathering and/or hygrothermal ageing on the thermomechanical properties of epoxy amine coating and the subsequent effect on the residual stresses (thermal and hygroscopic stresses) was investigated. Variations in the thermomechanical properties of coatings after artificial weathering and/or hygrothermal ageing, in comparison to fresh samples, were evaluated through various analyses. Feasibility of the determination of coefficient of hygroscopic expansion (αHF) from the slope of the plot of polynomial-fitted hygroscopic strain (ϵhygro) and moisture concentration at saturation (Csat) was also assessed. Residual stresses of 229 MPa and 334 MPa were calculated based on experimentally determined properties. These stresses were found to exceed the compressive strength of the coatings, which explains the delamination observed in peel-off adhesion tests.",

keywords = "Accelerated weathering, CUI, Corrosion under insulation, Epoxy, Hygroscopic expansion coefficient, Hygroscopic strain, Organic coatings, Residual stresses, hygrothermal stresses, Thermal ageing, Thermomechanical properties, UV",

author = "Ng, \{Janice Xin Yee\} and Tan, \{Nicholas Sheng Loong\} and Vladimir Golovanevskiy and Hanan Farhat and Thunyaluk Pojtanabuntoeng",

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year = "2025",

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doi = "10.1016/j.porgcoat.2025.109126",

language = "English",

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T1 - Effects of accelerated weathering and hygrothermal ageing on the thermomechanical properties and residual stresses of epoxy amine coatings

AU - Ng, Janice Xin Yee

AU - Tan, Nicholas Sheng Loong

AU - Golovanevskiy, Vladimir

AU - Farhat, Hanan

AU - Pojtanabuntoeng, Thunyaluk

PY - 2025/2/6

Y1 - 2025/2/6

N2 - The effect of artificial weathering and/or hygrothermal ageing on the thermomechanical properties of epoxy amine coating and the subsequent effect on the residual stresses (thermal and hygroscopic stresses) was investigated. Variations in the thermomechanical properties of coatings after artificial weathering and/or hygrothermal ageing, in comparison to fresh samples, were evaluated through various analyses. Feasibility of the determination of coefficient of hygroscopic expansion (αHF) from the slope of the plot of polynomial-fitted hygroscopic strain (ϵhygro) and moisture concentration at saturation (Csat) was also assessed. Residual stresses of 229 MPa and 334 MPa were calculated based on experimentally determined properties. These stresses were found to exceed the compressive strength of the coatings, which explains the delamination observed in peel-off adhesion tests.

AB - The effect of artificial weathering and/or hygrothermal ageing on the thermomechanical properties of epoxy amine coating and the subsequent effect on the residual stresses (thermal and hygroscopic stresses) was investigated. Variations in the thermomechanical properties of coatings after artificial weathering and/or hygrothermal ageing, in comparison to fresh samples, were evaluated through various analyses. Feasibility of the determination of coefficient of hygroscopic expansion (αHF) from the slope of the plot of polynomial-fitted hygroscopic strain (ϵhygro) and moisture concentration at saturation (Csat) was also assessed. Residual stresses of 229 MPa and 334 MPa were calculated based on experimentally determined properties. These stresses were found to exceed the compressive strength of the coatings, which explains the delamination observed in peel-off adhesion tests.

KW - Accelerated weathering

KW - CUI

KW - Corrosion under insulation

KW - Epoxy

KW - Hygroscopic expansion coefficient

KW - Hygroscopic strain

KW - Organic coatings

KW - Residual stresses, hygrothermal stresses

KW - Thermal ageing

KW - Thermomechanical properties

KW - UV

UR - https://www.scopus.com/pages/publications/85216883829

U2 - 10.1016/j.porgcoat.2025.109126

DO - 10.1016/j.porgcoat.2025.109126

M3 - Article

AN - SCOPUS:85216883829

SN - 0300-9440

VL - 201

JO - Progress in Organic Coatings

JF - Progress in Organic Coatings

M1 - 109126

ER -

Effects of accelerated weathering and hygrothermal ageing on the thermomechanical properties and residual stresses of epoxy amine coatings

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Keywords

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