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Cathodic disbondment of epoxy-glass flake coatings on different metal substrates in simulated seawater
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DOI：10.1016/j.ijoes.2026.101325.png)
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Abstract
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Glass flake coatings are widely used in marine and pipeline applications owing to their excellent barrier properties and corrosion resistance. However, cathodic disbondment (CD) may occur under applied cathodic potentials. In this study, epoxy-glass flake coatings with comparable thickness and similar composition were deposited on TC4 titanium alloy, 316 L stainless steel, C36000 brass, and X65 carbon steel to investigate their disbondment behavior under highly alkaline conditions (1 mol/dm(3) NaOH solution) and cathodic polarization (-850 mV, -1100 mV, and -1350 mV vs. Ag/AgCl) for 5 days. The results indicated that, in the absence of cathodic polarization, the coating-substrate interface on C36000 brass exhibited the highest resistance to alkali-induced disbondment, followed by 316 L stainless steel, X65 carbon steel, and TC4 titanium alloy, which can be related to the stability of metal-polymer interfacial bonding. Under cathodic polarization at -850 mV, -1100 mV, and -1350 mV, the resistance to cathodic disbondment consistently followed the same order: TC4 titanium alloy > C36000 brass > 316 L stainless steel > X65 carbon steel. Substrates on which hydrogen evolution became significant at relatively less negative potential, such as X65 carbon steel and 316 L stainless steel, exhibited more severe coating disbondment. In contrast, TC4 titanium alloy exhibited superior coating stability, which could be attributed to its more negative onset potential for hydrogen evolution, resulting in a lower hydrogen evolution rate under the same cathodic polarization conditions.
Keywords:
Glass flake coating
Cathodic disbondment
Coating-substrate interface
Hydrogen evolution
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