Journal
JOURNAL OF THERMAL SPRAY TECHNOLOGY
Volume 26, Issue 4, Pages 671-686Publisher
SPRINGER
DOI: 10.1007/s11666-017-0548-3
Keywords
aluminum alloys; bond strength; cold spray coating; interface morphology; random surface modification; surface topography
Categories
Funding
- OSEO
- Pole ASTech Paris Region
- Pole des microtechniques
- Pole Pegase
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This article is dealing with the effects of surface preparation of the substrate on aluminum cold-sprayed coating bond strength. Different sets of AA2024-T3 specimens have been coated with pure Al 1050 feedstock powder, using a conventional cold spray coating technique. The sets were grit-blasted (GB) before coating. The study focuses on substrate surface topography evolution before coating and coating-substrate interface morphology after coating. To study coating adhesion by LASAT(A (R)) technique for each set, specimens with and without preceding GB treatment were tested in load-controlled conditions. Then, several techniques were used to evaluate the effects of substrate surface treatment on the final coating mechanical properties. Irregularities induced by the GB treatment modify significantly the interface morphology. Results showed that particle anchoring was improved dramatically by the presence of craters. The substrate surface was characterized by numerous anchors. Numerical simulation results exhibited the increasing deformation of particle onto the grit-blasted surface. In addition, results showed a strong relationship between the coating-substrate bond strength on the deposited material and surface preparation.
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