Abstract
The influence of the concentration of Mn2+ in zinc phosphate solution on the formation of zinc phosphate crystals on cold rolled steel and electrogalvanized steel was studied. Mn content in Phosphophyllite crystal increased with the increase of Mn2+ concentration in the solution, while Fe content in the crystal decreased and Zn content did not vary. In the case of β-Hopeite crystal, the increase of Mn content caused the decrease of Zn content.X-ray diffraction data showed that the increase of Mn content and the decrease of Fe content in Phosphophyllite crystal had no influence on the P ratio. For both Phosphophyllite and β-Hopeite crystal species, the increse of Mn content contributed to the decline of main peak intensity, and this fact supported the hypothesis that the amorphous component of zinc phosphate film was formed partially. The peak pattern of (312) & (112) of Phosphophyllite crystal varied from two peak to one peak according to the increase of the Mn content in the crystal. In the case of β-Hopeite, 2 θ of (311, 241) was declined. Therefore, it was thought that for both crystals, the structure strain of crystals was caused by the action of Mn content.
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