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Influence of stabilizing agents on structure and protection performance of zirconium oxide films

Ugas-Carrion, Ruperto and Sittner, Falk and Yekehtaz, Mehdi and Flege, Stefan and Brötz, J. and Ensinger, Wolfgang :
Influence of stabilizing agents on structure and protection performance of zirconium oxide films.
[Online-Edition: http://www.sciencedirect.com/science/article/B6TVV-4X8J659-2...]
In: Surface and Coatings Technology, 204 (12-13) pp. 2064-2067.
[Article] , (2010)

Official URL: http://www.sciencedirect.com/science/article/B6TVV-4X8J659-2...

Abstract

We recently found that stabilizing agents have a strong effect on the interface structure of sol-gel deposited coatings. In this work we investigated the influence of the stabilizing agents hydroxypropyl cellulose (HPC) and acetylacetone (acac) on the protection performance and structure of protective zirconium oxide coatings which were deposited from zirconium-tetrapropoxide onto iron samples and heated at 675 K.The crystalline structure of the films was characterized with X-ray diffraction (XRD) and transmission electron microscopy (TEM). The element distribution and chemical composition was studied with energy dispersive X-ray spectroscopy (EDX) and secondary ion mass spectrometry (SIMS). Film porosity and protection performance were measured electrochemically with potentiodynamic scans. XRD measurements revealed a higher amount of crystalline zirconium oxide on the surface for acetylacetone coatings than for HPC. However, the SIMS depth profiles showed a thicker mixed iron-zirconium oxide layer in the case of HPC samples. Although the electrochemical results of acetylacetone films indicated a good protection with low film porosity, the dissolution currents of the HPC coatings were still two orders of magnitude lower than for acac. This means, with the use of HPC the protection ability of zirconium coatings on iron can be improved significantly.

Item Type: Article
Erschienen: 2010
Creators: Ugas-Carrion, Ruperto and Sittner, Falk and Yekehtaz, Mehdi and Flege, Stefan and Brötz, J. and Ensinger, Wolfgang
Title: Influence of stabilizing agents on structure and protection performance of zirconium oxide films
Language: English
Abstract:

We recently found that stabilizing agents have a strong effect on the interface structure of sol-gel deposited coatings. In this work we investigated the influence of the stabilizing agents hydroxypropyl cellulose (HPC) and acetylacetone (acac) on the protection performance and structure of protective zirconium oxide coatings which were deposited from zirconium-tetrapropoxide onto iron samples and heated at 675 K.The crystalline structure of the films was characterized with X-ray diffraction (XRD) and transmission electron microscopy (TEM). The element distribution and chemical composition was studied with energy dispersive X-ray spectroscopy (EDX) and secondary ion mass spectrometry (SIMS). Film porosity and protection performance were measured electrochemically with potentiodynamic scans. XRD measurements revealed a higher amount of crystalline zirconium oxide on the surface for acetylacetone coatings than for HPC. However, the SIMS depth profiles showed a thicker mixed iron-zirconium oxide layer in the case of HPC samples. Although the electrochemical results of acetylacetone films indicated a good protection with low film porosity, the dissolution currents of the HPC coatings were still two orders of magnitude lower than for acac. This means, with the use of HPC the protection ability of zirconium coatings on iron can be improved significantly.

Journal or Publication Title: Surface and Coatings Technology
Volume: 204
Number: 12-13
Publisher: Elsevier Science Publishing Company
Uncontrolled Keywords: Hydroxypropyl cellulose; Acetylacetone; Stabilizer; Sol–gel; Corrosion
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 26 Feb 2010 12:33
Official URL: http://www.sciencedirect.com/science/article/B6TVV-4X8J659-2...
Funders: The authors gratefully acknowledge Dr. G. Miehe for his PIEP program.
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