Effect of Different Phytates on Corrosion Behaviors of Carbon Steel
The study on the preparation and properties of new anti-rust pigments is of significance for the development of anticorrosion coatings.In this paper,phytates were prepared by reaction of sul-fates with sodium phytate.The phytates were characterized using SEM,EDS,FT-IR,and XRD analysis.The results showed that the prepared phytates were amorphous containing obvious phosphate groups,and presented as spherical particles with a diameter of 300-400 nm.The solubilities of phytates in aque-ous solution were analyzed through titration test.The corrosion behavior of Q235 steel in phytate-extract-ing solutions,which were acquired by soaking aluminum-,magnesium-,calcium-,manganese-and zinc-phytates,respectively,in 3.5％NaCl solution and then leaching,were studied via immersion test,Tafel po-larization,and electrochemical impedance spectroscopy.The findings revealed that the corrosion rate of carbon steel increased in aluminum phytate-extracting solution due to the production of aluminum-acid(Al(OH)3).However,the corrosion rates decreased in the other four extracting solutions.Notably,the inhi-bition rate of zinc phytate was approximately 92.46％.
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