|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.14 [2007] >
IJCT Vol.14(5) [September 2007] >
| Title: | Corrosion studies of Ni-free austenitic stainless steel in methanol containing H₂SO₄, HCl and LiCl |
| Authors: | Singh, V B
Ray, Monali |
| Keywords: | Austenitic stainless steel
Potentiostatic polarization
Corrosion
Passivity
Pitting |
| Issue Date: | Sep-2007 |
| Publisher: | CSIR |
| IPC Code: | C23F11/00, G01N17/00 |
| Abstract: | The corrosion behaviour of an austenitic stainless steel containing nitrogen with negligible amount of nickel has been investigated in methanol-H₂SO₄, methanol-HCl, and methanol-LiCl solutions using potentiostatic polarization technique. The cathodic reaction was the hydrogen evolution reaction. Active, passive and transpassive behaviours were observed only at high concentrations of H₂SO₄ (0.01-1.0 M) in methanol, and passivity was due to the high inherent water content in sulphuric acid. Pitting was also observed on the steel surface. The pitting potential became nobler as the concentration of H₂SO₄ increased. In 0.1 and 1.0 M H₂SO₄, a cathodic loop, characterized by measured negative current in the anodic region, was also observed. In methanol-HCl and methanol-LiCl solutions, the steel dissolved actively and no active-passive transition was observed. The corrosion rate was significantly higher in methanol-HCl solution as compared to methanol-LiCl due to the synergistic effects of acid and chloride ion. |
| Page(s): | 488-493 |
| ISSN: | 0971–457X |
| Source: | IJCT Vol.14(5) [September 2007]
|
|
