Abstract
• V-shaped grooves were produced by nanosecond laser texturing. • Recast material around the grooves reduce the delamination rate of the epoxy coating. • Coating delamination rate is strongly affected by surface tortuosity factor. • Phenomena such as mechanical interlocking and hooking increase the corrosion resistance of the epoxy coating. Nanosecond laser surface texturing has demonstrated to be an effective alternative for pretreatment of steel surfaces prior to organic coating deposition. The morphology of the structures fabricated through this technology (V-shaped groove + recast material) improve the coating/steel interface adhesion and stability. In this work, the influence of the recast material on the resistance to creep corrosion propagation of epoxy-coated laser-textured surfaces is investigated. Results show that the presence of the recast material reduce the delamination rate of the organic coating. The specific geometry of the laser-textured surfaces adds mechanical interlocking phenomena to the epoxy coating. The lifting of the disbonded coating is diminished due to mechanical hooking of the recast material around the grooves. The textured surface conditions seem to influence the coating failure due to mechanical stresses.
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