|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.12 [2005] >
IJCT Vol.12(6) [November 2005] >
| Title: | Wood bark oils as vapour phase corrosion inhibitors for metals in NaCl and SO2 environments |
| Authors: | Poongothai, N
Rajendran, P
Natesan, M
Palaniswamy, N |
| Keywords: | Mild steel
copper
corrosion
NaCl
bark oils
vapour phase inhibitor
inhibition efficiency |
| Issue Date: | Nov-2005 |
| Publisher: | CSIR |
| IPC Code: | C23F11/00 |
| Abstract: | Wood bark oils
of Cassia siamea-gonrai (CS), Cassia auriculata (CA), Crataeva religiosa (CR) and Strychnos nux-vomica (SNV) were
extracted from the dry bark. These highly volatile oils are used as a vapour
phase corrosion inhibitors (VPI) for mild steel and copper in sodium chloride
and sulphur dioxide environments. The inhibition efficiency of these wood bark
oils has been examined by using weight loss, potentiodynamic polarization and
A.C. impedance spectroscopic methods. It has been found that the inhibition
capability of these oils increases with increase in concentration from 0.4 to
4%. The results indicate that the bark oils have significant inhibitive effect.
This is due to adsorption of inhibitor molecule on the metal surface. At higher
concentration (8%) of the inhibitor, there is decrease in inhibition
efficiency. It may be due to the formation of soluble metal-inhibitor complex
in the salt environments. It has also been found that 4% concentration of these
inhibitors offered, above 90% inhibition efficiency for both mild steel and
copper. |
| Page(s): | 641-647 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.12(6) [November 2005]
|
|
