Sedimentation tests for rolling oils

Sedimentation experiments have been performed with steel and iron oxide micrometresized particles in pure liquids and industrial oils emulsified in water. They demonstrated the influence of viscosity and the action of certain surfactants dissolved in pure liquids on the aggregation or dispersion of the particles. It was also seen that some stable emulsions can be broken down by the presence of the particles which adsorb the surfactants from the emulsions. The results of these novel tests are positively correlated with the rolling oil quality in industrial conditions.