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Thursday, 26 November 2020
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Raw materials & technologies, Technologies

Effect of laser structured micro patterns on the polyvinyl butyral/oxide/steel interface stability

Monday, 19 October 2020

A recent work investigated the effect of steel substrate topography and roughness on cathodic disbonding resistance and wet adhesion of the polyvinyl butyral/oxide/steel interface.

Laser structuring was employed to pattern steel surfaces. Image source: jplenio - Pixabay (symbol image).

Laser structuring was employed to pattern steel surfaces. Image source: jplenio - Pixabay (symbol image).

Laser structuring was employed to pattern steel surfaces with controlled, periodic peaks of different peak-to-valley height, Rz, and geometry. Grinded smooth samples were used for reference. The in-situ scanning Kelvin probe technique was used to follow the cathodic disbonding in humid air and wet adhesion loss in inert atmosphere (3 ppm O2).

Mechanical interlocking force

Both cathodic disbonding and wet adhesion loss depended on the ability of the surface for mechanical adhesion, even when compensating for the increased effective contact area. X-ray photoelectron spectroscopy excluded the possibility for oxide chemistry effects on the delamination rate. Surfaces with features that enabled mechanical interlocking forces, had the best cathodic disbonding resistance and wet adhesion properties.

The study has been published in Progress in Organic Coatings, Volume 147, October 2020.

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