Influence of Protective Oil on Properties of Automotive Phosphate Layer

Protective oils are applied on metal substrates after steel manufacturing to prevent corrosion damages. This layer can reduce physical and mechanical properties of paint film. As a result, it should be removed before coating application.In this work the effect of this layer on properties of automotive phosphate layer was investigated using scanning electron microscope (SEM) and weight of phosphate layer.It was seen that this layer reduced the homogeneity of phosphate layer, changed the crystal shape of phosphate layer and increased phosphate weight unfavorably.