Study on Phosphating Pretreatment Properties of Hot-Rolled Pickling Steel Plate with Honeycomb Surface Morphology

In order to study the effect of honeycomb surface on the phosphating properties of hot-rolled pickling plate， and to analyze the reasons for the formation of honeycomb surface as well as the mechanism for the honeycomb surface to influence the growth of phosphating film， a phosphating film was prepared on the honeycomb surface of steel plate. Glow spectrometer and roughness tester were used to analyze the surface element distribution and the roughness of steel plate surface. Scanning electron microscope was used to observe the morphology of the steel plate surface and phosphating film. X-ray diffraction was used to analyze the P ratio of phosphating film. And the electrochemical workstation was used to study the corrosion resistance of phosphating film and the activity of steel plate with honeycomb surface in phosphating solution. Results showed that on the honeycomb surface of pickling plate， the phosphorization film coverage rate was less than 100%， the P ratio of phosphorization film was 70.1%， the impedan