Research Article
The Electropolishing of C-Steel in Orthophosphoric Acid Containing Methanolic Plant Extract
Table 4
Measured roughness (Ra), Rq (RMS), Peak-valley ratio, and brightness of C-steel samples.
| Sample | EP conditions | Brightness (gloss value) | Peak-valley ratio (μm) | Ra (μm) | Rq (RMS) (μm) |
| A | Before electropolishing | 11.1 | 4.8 | 2.7 | 3.4 | B | After EP without additives | 16.0 | 0.47 | 0.52 | 0.66 | C | After EP + 100 ppm guava leaves | 18.0 | 0.40 | 0.44 | 0.56 | D | After EP + 500 ppm guava leaves | 24.5 | 0.30 | 0.28 | 0.32 | E | After EP + 100 ppm chamomile | 18.4 | 0.36 | 0.40 | 0.52 | F | After EP + 500 ppm chamomile | 27.0 | 0.29 | 0.23 | 0.23 | G | After EP + 100 ppm coriander seeds | 19.2 | 0.34 | 0.36 | 0.48 | H | After EP + 500 ppm coriander seeds | 56.59 | 0.28 | 0.21 | 0.22 | I | After EP + 100 ppm marjoram | 21.9 | 0.31 | 0.32 | 0.42 | J | After EP + 500 ppm marjoram | 64.9 | 0.22 | 0.17 | 0.20 |
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