US Patent 11504588 Rusty oxidizable metal face golf club head

Described herein is a golf club head. The golf club head comprises a heel portion, a sole portion, a toe portion, opposite the heel portion, a top portion, opposite the sole portion, a rear portion, and a front portion, opposite the rear portion and comprising a strike face. An outer surface of at least the rear portion and at most a limited part of the strike face is made of a non-oxidizable metal material. At least a part of the strike face is made of an oxidizable metal material.