Avc. Sobral et al., Characterization and corrosion behavior of injection molded 17-4 PH steel electrochemically coated with poly[trans-dichloro(4-vinylpyridine)ruthenium], J SOL ST EL, 4(7), 2000, pp. 417-423
The present study describes preliminary results on the corrosion resistance
of injection molded 17-4 PH stainless steel potentiostatically coated with
poly {trans-[RuCl2(vpy)(4)]}, where vpy (4-vinylpyridine) acts as a ligand
. The coated electrodes were characterized by scanning electron microscopy
and energy dispersive spectroscopy, as well as by electrochemical technique
s. The microstructural analysis indicated that the films reached up to 100
mu m thickness. Cyclic voltammetry was carried out in 0.1 M tetrabutylammon
ium hexafluorophosphate/methyl isobutyl ketone. The results revealed a scan
rate dependent wave corresponding to a Ru2+/Ru3+ redox reaction, thus conf
irming the presence of ruthenium in the films. Anodic polarization tests we
re performed in 3% NaCl in order to estimate the anodic dissolution current
density and the corrosion rate of the material. The results indicated that
coating the substrate improved the corrosion resistance of the material.