Abstract
The effect of heat treatment on the corrosion resistance of sputter-deposited aluminum-chromium alloys containing 16-51 at% chromium has been studied in 0.1 and 0.5 M HCl. Structural relaxation decreases the corrosion rate of Al-16Cr alloy on which the passive film cannot be formed, since the corrosion rate is controlled by the reactivity of the alloy surface. The corrosion rate of spontaneously passive Al-35Cr alloy increases by crystallization. The chromium enrichment of the matrix, as a result of precipitation of a nanocrystalline aluminum-rich phase, results in enhancement of the corrosion resistance. However, if the size of the less corrosion-resistant aluminum-rich grains exceeds a critical limit of approximately 20 nm, the corrosion resistance decreases.
| Original language | English |
|---|---|
| Pages (from-to) | 477-499 |
| Number of pages | 23 |
| Journal | Corrosion Science |
| Volume | 41 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1998 Mar 1 |
Keywords
- AFM
- Alloy
- Aluminum
- Passive films
- Pitting corrosion