Effect of Nano-SiO2 Particles and Sol on Phosphate Conversion Coatings on 35CrMnSi Steel

The present study focused on the effect of nano-SiO2 on phosphate chemical conversion (PCC) coatings on 35CrMnSi steel prepared in PCC bath with addition of nano-SiO2 in the form of particles and sol. It was found that the microstructure and corrosion resistance of the coatings largely depended on t...

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Published inJournal of the Electrochemical Society Vol. 163; no. 9; pp. C571 - C575
Main Authors Jiang, Cong-cong, Zhu, Rui-fu, Xiao, Gui-yong, Zheng, Yong-zhen, Wang, Ling-ling, Lu, Yu-peng
Format Journal Article
LanguageEnglish
Published The Electrochemical Society 01.01.2016
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Summary:The present study focused on the effect of nano-SiO2 on phosphate chemical conversion (PCC) coatings on 35CrMnSi steel prepared in PCC bath with addition of nano-SiO2 in the form of particles and sol. It was found that the microstructure and corrosion resistance of the coatings largely depended on the form and concentration of nano-SiO2. The proper addition of nano-SiO2 in PCC bath could significantly decrease crystal size and improve corrosion resistance. The coating formed in bath with addition of 100 ml/L SiO2 sol possessed a compact, uniform and fine-crystal microstructure as well as enhanced corrosion resistance. It was demonstrated that the alternative method of introducing SiO2 sol into PCC bath could avoid the agglomeration of nano-SiO2 drastically and make the coating have smooth crystal surfaces.
Bibliography:1051609JES
ISSN:1945-7111
DOI:10.1149/2.1051609jes