Abstract
This work focused on the role of Al2O3 particles in the corrosion behavior of cold sprayed AA5083 aluminum alloy matrix composite (Al-MMC) coatings. The electrochemical characterization of the coatings was investigated in a 3.5 wt.% NaCl solution as a function of time. The results show that fragmentation of Al2O3 particles is not clearly observed in the case of AA5083/20 vol.% Al2O3 coating, while the broken Al2O3 particles can be seen clearly in AA5083/40 vol.% Al2O3 and AA5083/60 vol.% Al2O3 coatings. The addition of 20 vol.% Al2O3 particles yield the coating with the lowest porosity, and different volume fractions of Al2O3 in the feedstock have important effects on the electrochemical behavior of composite coatings. The Al-MMC coating reinforced with 20 vol.% Al2O3 particles exhibits the highest Ecorr and the lowest icorr compared with the other conditions. The order of current density is as follows: AA5083/20 vol.% Al2O3 < AA5083 < AA5083/40 vol.% Al2O3 < AA5083/60 vol.% Al2O3.
Original language | English |
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Pages (from-to) | 117-128 |
Number of pages | 12 |
Journal | Journal of Materials Science and Technology |
Volume | 59 |
DOIs | |
State | Published - 15 Dec 2020 |
Keywords
- Alumina particles
- Aluminum alloy
- Cold spray
- Composite coating
- Electrochemical characterization