| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Coatings to Protect Materials from Extreme Environments
|
| Presentation Title |
The Efficacy of Inorganic Zinc-Rich Primers to Mitigate Stress Corrosion Susceptibility in Al-Mg Alloys |
| Author(s) |
Matthew McMahon, Allison Akman, Eric Dau |
| On-Site Speaker (Planned) |
Matthew McMahon |
| Abstract Scope |
Al-Mg alloys having 3-5 wt.% Mg content are common alloys used in marine structural applications that require light weight, high strength, and good weldability. Over long periods at 40ᵒC or more, however, the supersaturated Mg content causes sensitization in service, which causes increased susceptibility to intergranular stress corrosion cracking (IG-SCC). Previous work has demonstrated that cathodic protection via Zn-rich primers is selectively effective towards mitigating IG-SCC, however more work is needed before such a solution can be utilized in marine service.
The present work evaluates a wide range of high-performing Zn-rich primers through use of the galvanostatic pulse test and accelerated stress corrosion cracking evaluations to understand key coating properties needed for optimal performance. The achieved efficacy of IG-SCC mitigation is compared to coating mechanical properties and ease of application to inform ease of use and likelihood of success in aggressive marine service conditions. |