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IJCT Vol.12 [2005] >
IJCT Vol.12(6) [November 2005] >
| Title: | Effect of Cr(VI) - Fe(II) interaction on the corrosion resistances of iron at different pH in dichromate solutions |
| Authors: | Singh, I B
Venkatachari, G
Singh, D R
Singh, M
Yegneswaran, A H |
| Keywords: | Iron
dichromate ion
corrosion resistance
Cr(VI) - Fe(II) interaction |
| Issue Date: | Nov-2005 |
| Publisher: | CSIR |
| IPC Code: | C23F13/00; C23F15/00 |
| Abstract: | Effect of Cr(VI) - Fe(II) interaction on the
corrosion resistance of iron in dichromate solutions has been studied under different
experimental conditions. The presence of dissolved oxygen (DO) in the solution
decreases Cr(VI) reduction by Fe(II) at pH 4 which became quite noticeable at
pH 7. This probably influences corrosion of iron to certain extent. A positive
shift of OCP and measurements of a higher charge transfer resistances of iron
in dichromate solution of pH 2 and 3 suggest the formation of a protective film
on iron. Energy Dispersive X-ray Analysis (EDXA) of iron immersed in Cr(VI)
solution indicated a greater involvement of chromium in the formation of a
protective film at iron surface. On the other hand, the EDXA analysis showed a
decrease in chromium concentration in the reaction product film on the immersed
iron surfaces in Cr(VI) solution at pH 4 and above. A shift of OCP in the
negative direction and the occurrence of lower charge transfer resistance at
the above pH as compared to pH 2 and 3 is attributed to a decrease in the
protective properties of the film. |
| Page(s): | 635-640 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.12(6) [November 2005]
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