Abstract
This 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 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). 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.
Highlights
Conventional wisdom in the heavy-duty coating industry says that blast cleaning improves coating performance by enabling mechanical interlocking between coating and substrate, i.e. mechanical adhesion forces
This work investigated the effect of steel substrate topography and roughness on cathodic disbonding resistance and wet adhesion of the polyvinyl butyral/oxide/steel interface
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)
Summary
Conventional wisdom in the heavy-duty coating industry says that blast cleaning improves coating performance by enabling mechanical interlocking between coating and substrate, i.e. mechanical adhesion forces. Results from a recent study indicated that mechanical interlocking is vital for the performance of heavy duty protective coatings [2]. It is widely accepted that the resistance of an organic coating against propagation of electrochemical degradation is determined more by the steel/coating interface than its barrier properties [3]. The standard explanation for the protective action of coatings, has been that coatings provide a high resistance between anodes and cathodes [6]. This work aims to study the effect of steel substrate topography and roughness on the stability of the coating/steel interface, measured as its wet adhesion property and resistance to cathodic disbonding (CD)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
