| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 296234 | Nuclear Engineering and Design | 2014 | 7 Pages |
•Surface roughness effect on the corrosion rate of Alloy 690 is provided.•Surface micro-hardness decreased as the roughness value decreased.•Cr-enriched polyhedral oxide particles were formed on the ground surfaces.•Ni-enriched strip-like oxides were formed on the polished surfaces.•Corrosion rate decreased with a decrease in the roughness value.
The purpose of this work is to investigate the effect of surface roughness on the corrosion behavior of Alloy 690TT steam generator tube material in simulated primary water at 330 °C. The surface roughness was controlled in the range of 710–25 nm by mechanical grinding and polishing method. Surface hardness gradually decreased with a decrease in the roughness value. Polyhedral oxide particles were formed on the ground surfaces, whereas the mixed oxides of a polyhedral and strip-like type were observed on the polished surface. The corrosion rate decreased by about 64% as the roughness values decreased from 710 to 150 nm. However, no further changes were observed in the range of 150–25 nm.
