Dissolution of base metal as a one of the early stage during initial phosphating, could with changing the
surface texture of base metal, affect the morphology of applied coating. In order to study this hypothesis, the
microstructure of carbon steel after removing the initial phosphate layer by grinding and elemental distribution
on this surface was studied by SEM (Cam Scan MV2300) equipped with the energy-dispersive X-ray (EDX)
facility. The results shown that the small particles of the initial phosphate coating containing Zn and P, entrapped
in the dissolved regions and notches of grinded surface. These elements could be considered as nuclei for crystal
formation in during final phosphating. Beside, with increasing the repeating number of phoaphating, surface
roughness increased that could be useful in rising surface activity and nucleation of phosphate crystallites.
Thereby, with increasing the repeating number of phoaphating, fine-grained and denser coatings, without of any
change in the composition of coating solution, were formed. Also, measuring the optimal-time coverage,
thickness, weight and density of the coating showed that, with increasing the repeating number of phoaphating,
denser coatings in the shorter time of operating were formed.