| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Corrosion and Environmental Degradation: Theory and Practice
|
| Presentation Title |
Re-Coating Adhesion Following Laser Ablation Coating Removal of Coatings and Lead on Metal Surfaces |
| Author(s) |
William Moffat, Jim Fitz-Gerald, Sean Agnew, Jason Provines, Stephen Sharp |
| On-Site Speaker (Planned) |
William Moffat |
| Abstract Scope |
Adhesion of coatings is critical to residential, commercial, and defense applications. Laser Ablation Coating Removal (LACR) has been used to remove old coatings and lead while simultaneously cleaning and preparing surfaces for re-coating. In this study, steel surfaces were subjected to LACR, grit blasting, and induction removal methods, and re-coated. Pull-off adhesion testing showed equivalent adhesion between grit blasted and LACR surfaces, despite a threefold decrease in surface roughness on the LACR cleaned surfaces. Two different cohesive failure modes were observed between these two conditions, mode I and mode II. The former left regions of bulk primer attached to the surface, whereas the latter left only a thin epoxy layer. A complementary set of samples were tested using a fracture mechanics-based adhesion test, which measures the interfacial bond strength between the coating and substrate. This testing showed that LACR cleaned surfaces can provide superior adhesion to grit blasted metal surfaces. |