|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||A Portable Solution to Corrosion Remediation of Sea Ships to Desensitize Severely Sensitized Aluminum Alloys Using Lasers
||Yongfeng Lu, Leimin Deng, Chenfei Zhang, Shiding Sun, Bai Cui
|On-Site Speaker (Planned)
The 5xxx series aluminum (Al) alloy has been widely used in marine environments such as ships due to its lightweight and mechanical strength. However, it has suffered from sensitization and subsequent intergranular/stress corrosion cracking when exposed to elevated temperatures and sea water. In corrosion remediation is usually carried out by sending ships to shipyards for regular maintenance which is time consuming and costly. In this study, a portable laser system was developed to achieve laser surface desensitization (LSD) of severely sensitized 5456 Al alloys. The LSD system is portable and can be used onboard ships during operation which can significantly save time and costs. The technique could realize rapid desensitization selectively on localized surface regions and within controllable depths. A degree of sensitization (DoS) of 1.7 mg/cm2, which was even lower than the original material, was achieved from severely sensitized 5456 Al alloys (a DoS of over 46.8 mg/cm2). Moreover, LSD not only reversed the sensitization with no loss of mechanical properties but it also significantly enhanced the future sensitization resistance of Al alloys at the same time.