Effect of Nano-SiO2 Particles and Sol on Phosphate Conversion Coatings on 35CrMnSi Steel. Issue 9 (1st January 2016)

• Record Type: Journal Article
• Authors: Jiang, Cong-cong; Zhu, Rui-fu; Xiao, Gui-yong; Zheng, Yong-zhen; Wang, Ling-ling; Lu, Yu-peng
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 9(2016)
• Page Start: C571
• Page End: C575
• Publication Date: 2016-01-01
• Subjects: 35CrMnSi steel -- Corrosion resistance -- Hopeite -- Nano-SiO2; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1051609jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : 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.