Influence of bath composition and pH on the electrocodeposition of alumina nanoparticles and nickel

被引：83

作者：

Bund, Andreas ^{[1
]}

Thiemig, Denny ^{[1
]}

机构：

[1] Tech Univ Dresden, Dept Phys Chem & Electrochem, D-01062 Dresden, Germany

来源：

SURFACE & COATINGS TECHNOLOGY | 2007年 / 201卷 / 16-17期

关键词：

electrocodeposition; nickel; alumina; zeta potential;

D O I：

10.1016/j.surfcoat.2007.01.010

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nanocomposite coatings of nickel and alumina (primary crystallite size 13 mn) were electroplated from an acidic and an alkaline bath. Interestingly the layers from the alkaline bath contained almost three times more particles (4 wt.%) than those deposited from the acidic bath (1.5 wt.%). Measurements of the zeta potential showed that the particles in the acidic bath are positively charged and in the alkaline bath they are negatively charged. A simple electrostatic model is proposed which can explain the preferential codeposition of the negatively charged particles. Furthermore the hardness and the electrical conductivity of the layers were characterized. For the acidic bath the hardness of the layer increased with the particle content. This hardening effect is at least partly caused by a change in the microstructure. Finally, the electrical conductivity can be used as. a rough estimate of the particle content of the layers. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：7092 / 7099

页数：8

共 21 条

[11] Properties and microstructure of nickel electrodeposited from a sulfamate bath containing ammonium ions [J].