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Formation and Structure of Alkyl-Phosphonic Acid Layers on Passive Iron

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Abstract:

Phosphonate layer formation on passive iron surface has been investigated by electrochemical and atomic force microscopy techniques. It was found that phosphonate groups bond more strongly to oxide surface, while metallic iron surface is disadvantageous for phosphonate layer formation in aqueous solutions. The rate of anodic dissolution is continually decreasing due to the time-dependent formation of protective phosphonate layer. The kinetics of phosphonate layer formation on passive iron is determined by the potential applied for preceding passive film formation. The size and shape of iron oxide grains depends slightly on the potential of passivation. Changes in morphology due to the phosphonate layer formation have been recorded by AFM.

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Periodical:

Materials Science Forum (Volumes 537-538)

Pages:

239-246

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.537-538.239

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Online since:

February 2007

Authors:

A. Paszternák, Ilona Felhősi, Z. Keresztes, Erika Kálmán

Keywords:

Corrosion Protection, Passive Iron, Phosphonic Acid, Surface Modification, Thin Layer

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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