这是在船坞建造阶段，有颜色的应该是高强度钢材。事实上福特在使用中的可靠性问题就是腐蚀造成的，直流比交流只会更差。

https://www.defensenews.com/naval/2023/02/03/navy-replaces-troubled-part-on-ford-carrier-after-test-cancelation/

The service found the failure was caused by “corroded fasteners in various components” of the electro mechanical actuators, according to the report.