The Creality CR-Laser Falcon 5W is not designed to engrave or cut aluminium, especially if it is a thick plate. Here are some key points to consider:

- Supported materials: The Falcon 5W is compatible with materials such as wood, bamboo, rubber, leather, fabric, acrylic, and painted metal surfaces, but is not specifically designed for aluminium.
- Engraving depth: The maximum engraving depth of the Falcon 5W is 0-3 mm, and its cutting capacity is up to 5 mm for materials such as lindero wood, but it is not suitable for aluminium.

If you need to create serial codes on an aluminium plate, you may have to consider a more powerful laser device or one specifically designed to work with metals. However, the Falcon 5W can be used for engraving on painted metal surfaces, but not on raw aluminium.