Abstract
The microstructure und corrosion behaviour of the thermite reaction coatings for the systems of Al-CuO-SiO2, Al-Cr2O3-SiO2, and AlTiO2-SiO2that produced by laser cladding on aluminium alloy 7075 have been studied. The results of the XRD analysis show that in all the three reaction coatings, α-Al2O3and γ-Al2O3phases were present together with various intermetallic phases and the corresponding reduced metal. A comparison of the polarisation curves of the untreated and the various coated specimens shows that except for the Al-CuO-SiO2system, the corrosion current density of the coated specimens was one order of magnitude lower than that of the untreated specimen, also a higher corrosion potential was obtained. The inferior corrosion resistance of the Al-CuO-SiO2system is attributed to galvanic corrosion occurred between the reduced metal, the intermetallic compounds and aluminium.
| Original language | English |
|---|---|
| Pages (from-to) | 948-951 |
| Number of pages | 4 |
| Journal | Materials Transactions |
| Volume | 47 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Mar 2006 |
Keywords
- Aluminium alloy
- Corrosion
- Laser cladding
- Thermite reaction
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering