Effect of surface roughness on the surface lubrication performance of galvanized steel sheets with a self-lubricated coating

摘要

Four kinds of galvanized steel sheets having different surface roughness values were used to prepare the steel sheets with a self-lubricated coating. The effects of surface roughness on the surface lubrication performance of the steel sheets were examined using a friction coefficient tester. Results revealed large dynamic friction coefficients for the galvanized steel sheets,which increased remarkably with surface roughness. Once the self-lubricated coating was applied,significant drops in the dynamic friction coefficients were measured. After the first stage of the friction test,the coefficients were almost unchanged,which reflected a weak dependence on the surface roughness of the self-lubricated steel sheets. However,the dynamic friction coefficients gradually increased as the test progressed,where these increase clearly correlated with the surface roughness of the self-lubricated steel sheets.