Influence of Silane Films in the Zinc Coating Post-Treatment

Abstract:

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The sol-gel process based on silanes precursors appeared in recent years as a strong alternative for post-treatment to provide an optimization of the protective efficacy of zinc. Moreover, this process has been used to replace chemical chromating conversion based on hexavalent chromium. The silane films are hybrid compounds that provide characteristics of both polymeric materials, such as flexibility and functional compatibility, and ceramic materials, such as high strength and durability. The present work aimed to evaluate the influence of silane films obtained by dip-coating, on the characteristics of electrodeposited zinc coatings. The xerogel films showed a homogeneous surface and a better performance on the corrosion resistance than zinc coating without post-treatment, what can be confirmed by the electrochemical impedance results. These tests showed that application of the silane film promotes the occurrence of one more time constant compared to pure zinc system, hindering the corrosion process.

Info:

Periodical:

Materials Science Forum (Volumes 660-661)

Edited by:

Lucio Salgado and Francisco Ambrozio Filho

Pages:

215-220

DOI:

10.4028/www.scientific.net/MSF.660-661.215

Citation:

M. V. da Costa et al., "Influence of Silane Films in the Zinc Coating Post-Treatment", Materials Science Forum, Vols. 660-661, pp. 215-220, 2010

Online since:

October 2010

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$38.00

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