A cap configured to be connected to a wheel having a hub and a series of openings configured to receive fasteners attaching the wheel to a vehicle. The cap includes a disc defining a series of openings. The number of openings in the cap is less than the number of openings in the wheel. Each opening in the cap is configured to align with a corresponding opening in the wheel. Additionally, the cap is configured to conceal a remainder of the openings in the wheel that are not aligned with the openings in the cap.

A cap configured to be connected to a wheel having a hub and a series of openings configured to receive fasteners attaching the wheel to a vehicle. The cap includes a disc defining a series of openings. The number of openings in the cap is less than the number of openings in the wheel. Each opening in the cap is configured to align with a corresponding opening in the wheel. Additionally, the cap is configured to conceal a remainder of the openings in the wheel that are not aligned with the openings in the cap.

The invention provides a surface treatment method for a magnesium alloy hub. The process includes: cleaning a to-be-treated surface of the magnesium alloy hub; blackening the cleaned to-be-treated surface; and laser cladding the blackened to-be-treated surface, wherein a laser cladding mode is a synchronous powder feeding mode, and a coating material is chromium. According to the surface treatment method for the magnesium alloy hub, air holes can be avoided.