Ionic Liquid [BMPy]Br as an Effective Additive During Zinc Electrodeposition from an Aqueous Sulfate Bath
The effects of a new ionic liquid additive 1-butyl-3-methylpyridinium bromide [BMPy]Br on the electrodeposition of zinc on steel substrates from acidic sulfate solution was investigated by employing potentiodynamic polarization and cyclic voltammetry techniques complemented with XRD and SEM measurements.
Concentration of [BMPy]Br (ppm) | Tafel slope b (mV/decade) | Exchange current density, log io (A/cm2) | Transfer Coefficient α |
0 | -256.4 | 1.40 × 10-5 | 0.05 |
200 | -197.2 | 2.53 × 10-6 | 0.07 |
300 | -151.9 | 2.47 × 10-7 | 0.08 |
500 | -115.7 | 1.09 × 10-8 | 0.11 |
700 | -112.0 | 9.09 × 10-9 | 0.12 |
1000 | -71.5 | 4.75 × 10-12 | 0.18 |
[BMPy]Br, ppm | NOP, mV | TP% | TI |
0 | 86.9 | -14.8 | 0.74 |
150 | 107.7 | --- | --- |
200 | --- | 2.8 | 1.10 |
300 | 172.3 | 18.2 | 1.52 |
500 | 204.5 | --- | --- |
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