METHOD FOR PREPARING VAPOR CHAMBER UPPER COVER PLATE, AND VAPOR CHAMBER

Provided are a method for preparing a vapor chamber upper cover plate, a vapor chamber upper cover plate, and a vapor chamber. The method for preparing the vapor chamber upper cover plate comprises the following processes: manufacturing a vapor chamber upper cover plate; performing electrochemical deposition on the upper cover plate, and thereby depositing and forming a capillary structure layer having a porous structure on an inner wall of the upper cover plate, wherein the upper cover plate acts as a cathode for the electrochemical deposition, and the material of the capillary structure layer is a zinc nickel alloy, an electrolyte solution for the electrochemical deposition comprises 60 g/L to 120 g/L of zinc sulfate, 60 g/L to 120 g/L of zinc sulfate, 40 g/L to 100 g/L of ammonium chloride and 0.7 g/L to 3.7 g/L of a second additive, and the electrolyte solution has a pH value of 2 to 5; and performing a heat treatment on the capillary structure layer to obtain a vapor chamber upper cover plate having the