Preparation of non‐chromium polymer films on zinc for corrosion protection due to a compound effect between silane and cerium salt

Da‐jing Fang (School of Resource and Environmental Science, Wuhan University, Wuhan, People's Republic of China)
Xu‐hui Mao (School of Resource and Environmental Science, Wuhan University, Wuhan, People's Republic of China)
Ye‐ming Zhang (School of Environmental Science and Engineering, Huangshi Institute of Technology, Huangshi, People's Republic of China)
Zhi‐liang Chen (School of Resource and Environmental Science, Wuhan University, Wuhan, People's Republic of China State Key Laboratory for Corrosion and Protection of Metals, Shenyang, People's Republic of China)
Min Liu (School of Resource and Environmental Science, Wuhan University, Wuhan, People's Republic of China State Key Laboratory for Corrosion and Protection of Metals, Shenyang, People's Republic of China)
Fu‐xing Gan (School of Resource and Environmental Science, Wuhan University, Wuhan, People's Republic of China State Key Laboratory for Corrosion and Protection of Metals, Shenyang, People's Republic of China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Publication date: 26 June 2009

Abstract

Purpose

The purpose of this paper is to study the compound effect between silane and cerium salts in the passivation process of chemical conversion treatment of zinc.

Design/methodology/approach

Chemical conversion treatment using 3‐Glycidoxypropyltrimethoxysilane on zinc is investigated as an alternative treatment to chromate conversion. The surface chemistry of the silane‐treated samples is investigated with mass change measurements, polarization curves, electrochemical impedance spectroscopy (EIS) and the salt spray tests (SST). The surface morphology of samples was studied using a scanning electron microscope.

Findings

The polarization curves, EIS and SST data are in agreement. On the surface of zinc, the silane formed a compound with the cerium, thus enhancing the adhesion and corrosion resistance of the polymer film.

Originality/value

There have been few reports on the compound effects of silanes and cerium salts in the passivation process. The mechanism of this compound effect may be due to the ability of Ce3 + ions to gain access to the interface through tiny cracks or micropores in the cross‐linking structure of GPS polymer films on zinc, and the subsequent oxidation of Ce3 + to Ce4 + by H2O2 may result in a barrier effect between the electrolyte and the metallic substrate.

Keywords

Citation

Fang, D., Mao, X., Zhang, Y., Chen, Z., Liu, M. and Gan, F. (2009), "Preparation of non‐chromium polymer films on zinc for corrosion protection due to a compound effect between silane and cerium salt", Anti-Corrosion Methods and Materials, Vol. 56 No. 4, pp. 226-231. https://doi.org/10.1108/00035590910969356

Download as .RIS

Publisher

:

Emerald Group Publishing Limited

Copyright © 2009, Emerald Group Publishing Limited

Please note you might not have access to this content

You may be able to access this content by login via Shibboleth, Open Athens or with your Emerald account.
If you would like to contact us about accessing this content, click the button and fill out the form.
To rent this content from Deepdyve, please click the button.