Metal product, method for manufacturing the metal product, and metal composite

A metal product, comprising:

• a metal substrate;
• at least one first hole defined in a surface of the metal substrate and formed by chemical corrosion or electrochemical electrolysis;
• a plurality of second holes defined in a portion of the surface of the metal substrate without the first hole and an inner surface defining the at least one first hole, wherein the plurality of second holes are formed by surrounding a plurality of protrusions, the plurality of protrusions are located on at least one of the portion of the surface of the metal substrate without the at least one first hole and the inner surface defining the at least one first hole, the plurality of protrusions are formed by glancing angle physical vapor deposition;
• and
• a plurality of third holes formed by an anodic oxidation treatment and defined in a portion of the surface of the metal substrate without the at least one first hole and without the plurality of second holes, a portion of the inner surface defining the at least one first hole without the plurality of second holes, and an inner surface defining the plurality of second holes.