Patent ID: 8178156

Claim:
A surface treatment process for a circuit board, in which the circuit board comprises a substrate, a first circuit layer, and a second circuit layer, wherein the substrate comprises a first surface and a second surface reverse to the first surface, the first circuit layer is disposed on the first surface, the second circuit layer is disposed on the second surface, and the first circuit layer and the second circuit layer are electrically connected, the surface treatment process for a circuit board comprising: forming a first solder mask layer and a second solder mask layer respectively on the first surface and the second surface of the substrate, wherein the first solder mask layer comprises at least one first opening to expose a portion of the first surface, and the second solder mask layer comprises a plurality of second openings to expose at least a portion of the second circuit layer; forming a cover layer on the first surface in the first opening, wherein the cover layer comprises a plurality of third openings to expose a portion of the first circuit layer; plating a first oxidation protection layer on the first circuit layer in the third opening and plating a second oxidation protection layer on the second circuit layer in the second openings by immersion; removing the cover layer; and performing a black oxidation process on the first circuit layer exposed by the first oxidation protection layer to form a black oxide layer, wherein a thickness of the first oxidation protection layer is thinner than or equal to a thickness of the black oxide layer.