Synthesis and corrosion study of zirconia-coated carbonyl iron particles

Coatings of faceted zirconia nanocrystals are synthesized on carbonyl iron (CI) magnetic particles using a sol–gel approach. The zirconia-coated CI particles show much improved air oxidation and acid corrosion resistances. This paper describes the surface modification of micrometer-sized magnetic ca...

Full description

Saved in:
Bibliographic Details
Published in:Journal of colloid and interface science 2010-02, Vol.342 (1), p.49-56
Main Authors: Shen, Rui, Shafrir, Shai N., Miao, Chunlin, Wang, Mimi, Lambropoulos, John C., Jacobs, Stephen D., Yang, Hong
Format: Article
Language:English
Subjects:
Carbonyl iron
Carbonyls
Chemistry
Coated particles
Coating
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Corrosion
Corrosion tests
Exact sciences and technology
General and physical chemistry
Iron
Magnetic particle
Roughness
Sol–gel
Surface physical chemistry
Zirconia
Zirconium dioxide
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Coatings of faceted zirconia nanocrystals are synthesized on carbonyl iron (CI) magnetic particles using a sol–gel approach. The zirconia-coated CI particles show much improved air oxidation and acid corrosion resistances. This paper describes the surface modification of micrometer-sized magnetic carbonyl iron particles (CI) with zirconia from zirconium(IV) butoxide using a sol–gel method. Zirconia shells with various thicknesses and different grain sizes and shapes are coated on the surface of CI particles by changing the reaction conditions, such as the amounts of zirconia sol, nitric acid, and CI particles. A silica adhesive layer made from 3-aminopropyl trimethoxysilane (APTMS) can be introduced first onto the surface of CI particles in order to adjust both the size and the shape of zirconia crystals, and thus the roughness of the coating. The microanalyses on these coated particles are studied by field-emission scanning electron microscopy (FE-SEM) and X-ray-diffraction (XRD). Accelerated acid corrosion and air oxidation tests indicate that the coating process dramatically improved oxidation and acid corrosion resistances, which are critical issues in various applications of CI magnetic particles.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2009.09.033