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

A method for manufacturing a metal product, comprising:

• putting a metal substrate into a first electrolyte as an anode, and putting a first cathode conductor in the first electrolyte as a cathode, wherein the first electrolyte comprises persulfate;
• applying electricity on the metal substrate and the first cathode conductor to electrolyze the metal substrate, thereby forming at least one first hole and at least one second hole in the metal substrate;
• putting the metal substrate with the at least one first hole and the at least one second hole into a second electrolyte as an anode, and putting a second cathode conductor in the second electrolyte as a cathode;
• and
• applying electricity on the metal substrate and the second cathode conductor to perform an anodic oxidation treatment, thereby forming at least one third hole in at least one of:
• a surface of the metal substrate without the at least one first hole and without the at least one second hole, an inner surface defining the at least one first hole, and an inner surface defining the at least one second hole.