Abstract
The modified Bridgman directional solidification technique was used to prepare the Ni-Si eutectic composites at solidification rate of 25 μm/s. However, the formation of metastable phase Ni31Si12 was inevitably during solidification process. Annealing treatment was conducted to reduce the number of metastable phases. Electrochemical impedance spectroscopy and potentiodynamic polarization techniques were used to analyze the corrosion resistance of Ni-Si eutectic composites in the 7wt% H2SO4 solution at 25℃. The equivalent circuit was analyzed. Results show that the passivation performance and corrosion resistance behavior of Ni-Si eutectic composites are improved after annealing at 1050℃ for 4 h, which is mainly attributed to improvement of content and distribution of metastable phase Ni31Si12. The less the content of metastable phase, the stronger the corrosion resistance.
| Translated title of the contribution | 亚稳相对定向凝固Ni-Si共晶腐蚀行为的影响 |
|---|---|
| Original language | English |
| Pages (from-to) | 3110-3115 |
| Number of pages | 6 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 50 |
| Issue number | 9 |
| State | Published - Sep 2021 |
Keywords
- Bridgman directional solidification
- Corrosion behavior
- Electrochemical
- Metastable phase
- Ni-Si eutectic composites