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ID 20604
file
creator
Yano, Jun
Nakatani, Kazumasa
Kitani, Akira
subject
Anti-corrosion
Iron
Polyaniline
poly(2-N-phenylamino-4,6-dimercapto-S-triazine)
Double-layer coating
NDC
Chemical technology
abstract
A poly(2-N-phenylamino-4,6-dimercapto-S-triazine) (PPDT) layer was first prepared electrochemically on an iron surface. The PPDT layer strongly adsorbed on the surface because of the polar triazine rings of the PPDT molecules. No electrochemical response of the PPDT layer covered electrode to dissolved Fe(CN)6 3- was observed. This fact indicated that the PPDT layer is an insulating layer with low permeability to dissolved species, and thus acting as a diffusion barrier against agents causing corrosion such as H2O and O2. A polymer polyaniline (PANI) layer was electrodeposited on the PPDT layer. This system was conductive because electron transfer through the PPDT layer occurred by electrons hopping utilizing the localized electron density of the triazine ring. The obtained PANI/PPDT bilayer coating greatly lowered the anodic current peak ascribed to the anodic dissolution of iron and the corrosion current. The high anti-corrosion ability was due to a hybrid effect of the PANI layer as an in-situ oxidant and the PPDT layer as a diffusion barrier.
journal title
Materials Letters
volume
Volume 61
issue
Issue 7
start page
1500
end page
1503
date of issued
2007-03
publisher
Elsevier Science B.V.
issn
0167-577X
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2006 Elsevier B.V.
relation url
department
Graduate School of Engineering