Preparation of Zinc Phytate and Its Effect on Corrosion Behavior of Carbon Steel
The performance-based study on anticorrosive pigment is of significance to the develop-ment of new pigment for anticorrosive coatings.Zinc phosphate and zinc phytate were prepared from phosphoric acid,phytic acid and zinc chloride.Then the two pigments were characterized by scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),thermogravimetry analysis(TG)and infrared spectroscopy(FT-IR).The solubility of zinc phosphate and zinc phytate in aqueous solution was analyzed by titration test.The corrosion characteristics of Q235 carbon steel in extracting solutions of zinc phosphate and zinc phytate were examined respectively by Tafel polarization method,electrochemi-cal impedance spectroscopy(EIS)and immersion test.The results showed that the zinc phosphate pres-ents micron-sheet like structure of non-uniform size with thickness in the range of 0.5-1 μm,and the zinc phytate was agglomeration particle with a particle size of 2-5 μm.While after extracting for 2 h,the con-tent of zinc phytate was basically saturated,and it showed that zinc phytate had excellent inhibition ef-fect,which could slow down the corrosion of Q235 steel with inhibition efficiency up to about 90％.
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