Frictional Behavior of Electrogalvanized Sheet Steels

The frictional behavior of two nominally 70 g/m² electrogalvanized sheet steels, mechanically processed with a series of surface roughnesses and coating morphologies, were evaluated with the bending under tension test. The crystallographic textures for the as-received materials were different; one was primarily prismatic with a friction coefficient of 0.14 and the other was primarily low angle pyramidal with a friction coefficient of 0.20. The friction coefficients were changed by surface modifications and values as high as 0.31 were observed. Friction data are discussed in terms of surface roughness, interfacial contact pressure, true contact area, and crystallographic texture. Results are interpreted on the basis of the deformation characteristics of the zinc coatings and with respect to overall sheet formability characteristics.