| Abstract Scope |
This presentation will describe how changes in cold spray parameters alter the pitting behavior of deposited AA2024 material (CS-2024). Cold spray is under development to repair corrosion damage in aircraft structures, but optimization for corrosion performance is still being investigated. A series of cold spray deposition parameters, including gas pressure (500, 600 and 700 psi), powder feed rate, and gun speed 100 or 200 mm/s were assessed. The pressure modified particle velocity, while the gun speed and powder feed rate modified the thickness deposited per layer. Subsequently, potentiodynamic polarization and five-day immersion tests were performed in aerated, artificial seawater, and compared against wrought AA2024-T3. Materials sprayed under different conditions showed similar potentiodynamic behavior. Pitting behavior, however, varied substantially with changes in spray conditions and correlated with microscale levels of deposit quality. Minimal pitting, even less than in wrought AA2024-T3, was observed for the CS-2024 which exhibited the least porosity. |