Paper Title:
Electroless Ni-P Composites with ZrO2: Preparation, Characterization, Thermal Treatment
  Abstract

The study of composite electroless Ni-P coatings is pursued in order to obtain coatings on a metal substrate with advanced properties i.e. with high wear and corrosion resistance for particular engineering uses. Composite NiP-ZrO2 layers were prepared by simultaneous electroless co-deposition of Ni-P and ZrO2 on steel, from a reducing solution in which ZrO2 particles were kept in suspension by stirring. The particles load in the bath was 0, 0.5, 1.0, 2.0 and 5.0 g/l. The deposits of 30 m in thickness, were characterized for structure, morphology and hardness by scanning electron microscopy and microanalysis as well as X-ray diffraction. It was found that the maximum ZrO2 particle incorporation attained was 7-10% of Zr. Vickers microhardness was measured for the plain deposit and found to be 720 HV and for the maximum zirconia content of 10%, 820 HV. After a vacuum heat treatment for 10 min, the microhardness of the composite is found to be 1500 HV. The electrochemical linear polarization measurements in a corrosive NaCl 3.5% solution shows at 2.0 g/l bath load favourable conditions for the formation of a defects free composite deposit could be created.

  Info
Periodical
Defect and Diffusion Forum (Volumes 297-301)
Edited by
Andreas Öchsner, Graeme E. Murch, Ali Shokuhfar and João M.P.Q. Delgado
Pages
899-905
DOI
10.4028/www.scientific.net/DDF.297-301.899
Citation
J. Novakovic, M. Delagrammatikas, P. Vassiliou, C.T. Dervos, "Electroless Ni-P Composites with ZrO2: Preparation, Characterization, Thermal Treatment", Defect and Diffusion Forum, Vols. 297-301, pp. 899-905, 2010
Online since
April 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Wen Feng Qin, Jiang Long, Feng Liu
Abstract:The surface morphology and hardness of electroless Ni–P alloy plating on 6061 aluminum alloys substrate in an alkaline plating bath with...
293
Authors: Wan Chang Sun, Ming Feng Tan, Jian Hua Lu, Lei Zhang, Quan Zhou
Abstract:Electroless Ni-P and Ni-P-Al2O3 composite coatings on low carbon steel (Q235) sheets were prepared by adopting optimum plating process. The...
831
Authors: Huan Ming Chen, Ya Hong Gao, Qiong Lv, Dong Yang, Xin Xin Lin
Chapter 7: Composite Materials
Abstract:The Ni-P-W/nano-Al2O3 composite coatings were deposited on the surface of sintered NdFeB permanent magnet by...
901
Authors: Ya Xu Jin, Yu Ming Tian, Qiu Shu Li
Chapter 1: Surface Engineering/Coatings
Abstract:Electroless nickel plating with potassium titanate whisker was co-deposited on medium carbon steel substrates. The microstructure of the...
70
Authors: Lin Cui, Shi Hai Zhao, Liang Huang
Chapter 6: Engineering Materials and Functional Materials
Abstract:Electroless nickel has been used to prepare composite coatings with embedded nanoparticles. Surfactants and agitation methods have marginal...
633