Mobile device case and coating method thereof

A method for coating a mobile device case for accommodating or covering a substrate and an electronic element located on the substrate, the method comprising:

• providing a case frame made of a high molecular material including a resin, wherein the case frame includes:
• a cover accommodating or covering the substrate, and
• protrusions protruding from the cover to be extended adjacent to the electronic element;
• allowing the case frame to be subjected to hot air drying to remove a cleaning agent and water from a surface of the case frame;
• allowing the surface of the case frame dried with hot air to be subjected to a cold plasma treatment to introduce polar functional groups to enable plating on the surface of the case frame;
• allowing the surface of the case frame to be subjected to a catalystic treatment and an activation treatment for post-processes;
• and
• forming a metal coating layer on the surface of the case frame by electroless plating.