Roughness and adhesion

Steel rods or plates should be protected against corrosion, especially when used with acidic timbers like oak. Stainless steel or hot dip zinc coated steel are frequently used. Stainless steel may give poor adhesion and, therefore, it is normally surface coated for improved roughness and adhesion. If hot dip zinc coated steel rods or bars are used, the application of a priming product to improve adhesion is normally required. Threaded rods or ribbed bars and textured plates may be used instead, and in this case the mechanical anchorage will also contribute to the bonding strength. Surface preparation is particularly critical in uncoated steel and it should... 

Because of the importance of particle adhesion in photocopiers, Mizes used an atomic force microscope to measure both surface roughness and adhesion simultaneously and showed that they were related by this argument. He demonstrated on four different surfaces that the adhesion fluctuations were directly related to the surface curvatme fluctuations, as shown in Fig. 9.12. 

The increase in adhesion of an organic system to an inorganic surface cleaned by an abrasion method can be a result of the increased surface area, and therefore of the increased interfacial contact, that is generated by these methods (see Roughness of surfaces and Roughness and adhesion). 

The relationship of surface roughness to adhesion is explored in the article Roughness and adhesion. 

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