Cathodic electrophoretic deposition of α-Fe2O3 coating
来源期刊：中南大学学报(英文版)2015年第6期
论文作者：MA Li CHANG Tong LI Xiao-bing LI Zhi-you ZHANG Dou ZHOU Ke-chao
文章页码：2027 - 2035
Key words：electrophoretic deposition; Fe2O3 coating; aqueous solutions; zeta potential
Abstract: Submicro α-Fe2O3 coatings were formed using electrophoretic deposition (EPD) technique in aqueous media. The zeta potentials of different α-Fe2O3 suspensions with different additives were measured as a function of pH to identify the optimum suspension condition for deposition. Electrophoretic depositions of α-Fe2O3 coatings under different applied electric fields and deposition time were studied and the effects of applied voltages and deposition time on deposition rates and thicknesses were investigated. The particle packing densities of the deposits at various applied voltages and deposition time were also analyzed by a scanning electron microscope (SEM). The results show that crack-free α-Fe2O3 coatings with uniform microstructure and good adherence to the nickel substrates are successfully obtained. Electrophoretic deposited α-Fe2O3 coating from aqueous suspension is a feasible, low-cost and environmental friendly method.
MA Li(马莉)1, 2, CHANG Tong(常通)2, LI Xiao-bing(李小斌)1, LI Zhi-you(李志友)2, ZHANG Dou(张斗)2, ZHOU Ke-chao(周科朝)2
(1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy (Central South University), Changsha 410083, China)
Abstract:Submicro α-Fe2O3 coatings were formed using electrophoretic deposition (EPD) technique in aqueous media. The zeta potentials of different α-Fe2O3 suspensions with different additives were measured as a function of pH to identify the optimum suspension condition for deposition. Electrophoretic depositions of α-Fe2O3 coatings under different applied electric fields and deposition time were studied and the effects of applied voltages and deposition time on deposition rates and thicknesses were investigated. The particle packing densities of the deposits at various applied voltages and deposition time were also analyzed by a scanning electron microscope (SEM). The results show that crack-free α-Fe2O3 coatings with uniform microstructure and good adherence to the nickel substrates are successfully obtained. Electrophoretic deposited α-Fe2O3 coating from aqueous suspension is a feasible, low-cost and environmental friendly method.
Key words:electrophoretic deposition; Fe2O3 coating; aqueous solutions; zeta potential
