2021/06/24 by Surya Effendy, Effendy, Surya, Tingtao Zhou +7
Engineering · Materials Science · Physics and Astronomy · #Applied Physics (physics.app-ph) #Concrete Corrosion and Durability #Corrosion Behavior and Inhibition #FOS: Physical sciences #Soft Condensed Matter (cond-mat.soft) #Structural Integrity and Reliability Analysis #cond-mat.soft #physics.app-ph
paper · pdf · doi:10.48550/arxiv.2106.13371
29 pages, 11 figures, submitted to Electrochimica Acta (under review)
openalex publication_date 2021/06/24 · arxiv created 2021/06/25 · arxiv updated 2021/06/28 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
A variety of polymeric surfaces, such as anti-corrosion coatings and polymer-modified asphalts, are prone to blistering when exposed to moisture and air. As water and oxygen diffuse through the material, dissolved species are produced, which generate osmotic pressure that deforms and debonds the coating.These mechanisms are experimentally well-supported; however, comprehensive macroscopic models capable of predicting the formation osmotic blisters, without extensive data-fitting, is scant. Here, we develop a general mathematical theory of blistering and apply it to the failure of anti-corrosion coatings on carbon steel. The model is able to predict the irreversible, nonlinear blister growth dynamics, which eventually reaches a stable state, ruptures, or undergoes runaway delamination, depending on the mechanical and adhesion properties of the coating. For runaway delamination, the theory predicts a critical delamination length, beyond which unstable corrosion-driven growth occurs. The model is able to fit multiple sets of blister growth data with no fitting parameters. Corrosion experiments are also performed to observe undercoat rusting on carbon steel, which yielded trends comparable with model predictions. The theory is used to define three dimensionless numbers which can be used for engineering design of elastic coatings capable of resisting visible deformation, rupture, and delamination.