Table 4 Optical profile results of copper in SCW inhibited by 2000 ppm NaNO2.
From: Sodium nitrite as a corrosion inhibitor of copper in simulated cooling water
Specimens | Average roughness Ra (μm) | Mean texture depth Rt (μm) | Roughness depth Rz (μm) | Average valley depth Rv (μm) | Average peak height Rp (μm) |
|---|---|---|---|---|---|
Polished | 0.06 | 0.57 | 0.38 | − 0.31 | 0.24 |
Blank | 0.21 | 2.23 | 1.16 | − 1.01 | 1.23 |
2000 ppm NaNO2 | 0.11 | 1.09 | 0.55 | − 0.51 | 0.45 |
