Improved microstructure and physiochemical properties of hopeite conversion coating by Si3N4 nanoparticles doping

Journal of Materials Research and Technology

Yong-zhen Zheng¹  Chun-miao Du²  Gui-yong Xiao³  Bing Liu³  Chuan-zhong Chen³  Yu-peng Lu³ 

[1] Corresponding author.;Suzhou Institute of Shandong University, Suzhou, 215123, China;School of Materials Science and Engineering, Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan, 250061, China;

关键词: Nanoparticles;    Conversion coating;    Hopeite;    Bonding strength;    Corrosion resistance;   

DOI  :  

来源: DOAJ

【 摘 要 】

The effect of nano-scaled Si3N4 particles on the microstructure, mechanical and electrochemical behavior of hopeite (Zn3(PO4)2·4H2O) conversion coating on pure titanium was investigated. Different concentrations of nanoparticles were dispersed into the phosphating bath to incorporate the process of coating deposition. The XRD results demonstrated that nano-Si3N4 were doped into the coatings without any decomposition or reaction with the hopeite phase. A finer and denser microstructure of the composite coating could be obtained at the addition of 0.5 g/L Si3N4 in comparison with the pure hopeite coating. Moreover, the composite coating presented a higher bonding strength and corrosion resistance related to the refinement of microstructure and filling of the embedded nanoparticles. It is suggested that the incorporation of nano-Si3N4 particles in conversion coating is a promising approach for performance optimization.

【 授权许可】

Unknown