Inorganic Chemicals Industry >
Effect of sealing treatment on properties of zinc phosphate conversion film on building structural steel
Received date: 2020-11-11
Online published: 2021-10-11
Zinc phosphate conversion film was prepared on building structural steel,and it was sealed with different types of sealing solution.The effect of sealing treatment on the microstructure,surface components,thickness and corrosion resistance of phosphate conversion film were studied.The results showed that sealing treatment had no significant influence on the macrostructure and thickness of phosphate conversion film,but there were some differences in the microstructure,surface components and corrosion resistance of phosphate conversion film.The surface components of unsealed and sealed phosphate conversion film were mainly Zn,O and P.After sealing treatment,the surface of phosphate conversion film tended to be flat,the compactness was improved,and the corrosion resistance was significantly improved,which was mainly attributed to that different types of sealing solution play a role in filling the grain gaps and preventing the corrosive medium from penetrating into the phosphate conversion film.The phosphate conversion film sealed with the sealing solution containing sodium silicate and cerium nitrate had smoother surface,the solution resistance and charge transfer resistance were the biggest,which was 58.2 Ω·cm 2 and 4.02×103 Ω·cm 2 respectively,and it had the greatest phase angle and the widest range of frequency.This phosphating film exhibited excellent corrosion resistance and ideal corrosion durability with application potential,and was expected to be used as the surface protection layer for building structural steel.
Danjing Wang , Jingkui Li . Effect of sealing treatment on properties of zinc phosphate conversion film on building structural steel[J]. Inorganic Chemicals Industry, 2021 , 53(10) : 92 -97 . DOI: 10.19964/j.issn.1006-4990.2020-0606
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