Table 2 Analysis of DEIS Nyquist chart for copper specimen immersed in SCW in inhibited and uninhibited state at time interval of 2 h, 6 h and 24 h.
From: Sodium nitrite as a corrosion inhibitor of copper in simulated cooling water
Time interval/concentration | First spectra | 2 h | 6 h | 12 h | 24 h | |||||
|---|---|---|---|---|---|---|---|---|---|---|
Yo | Rct | Yo | Rct | Yo | Rct | Yo | Rct | Yo | Rct | |
Blank | 951.7 | 19,406 | 315.8 | 11,532 | 156.1 | 12,620 | 133.6 | 14,930 | 112.3 | 20,730 |
2000 ppm | 97.7 | 9297 | 32.09 | 25,070 | 17.67 | 31,200 | 11.47 | 35,770 | 8.09 | 41,610 |
% IE | – | – | – | 54.01 | – | 59.55 | – | 58.26 | – | 50.18 |
