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1. Titanium anode for copper foil production
As one of the basic materials in the electronics industry, electrolytic copper foil is mainly used in the manufacture of printed circuit boards (PCB), copper clad laminates (CCL), etc., and is widely used in home appliances, communications, and computing (3C) industries. In recent years, due to the rapid development of the electronics industry and its characteristics of density, lightness, thinness, shortness and smallness, there are higher and newer requirements for copper foil, mainly in: low (low roughening), thin ( To develop below 12 microns), high (high physical properties, reliability), no (no defects in surface appearance), electrolytic copper foil is a copper processing product with a higher technical level.
2. Brief description of production process
Although the specifications and performance of electrolytic copper foil have their own characteristics due to different copper foil manufacturers, the manufacturing process is basically the same. That is, using electrolytic copper or scrap copper wire with the same purity as electrolytic copper as raw material, dissolving it in sulfuric acid to make an aqueous solution of copper sulfate, using the metal roller as the cathode, and continuously electrolyzing the surface of the cathode roller through the electrolytic reaction Metallic copper is deposited and continuously stripped from the cathode roll in a process known as green foil electrolysis. The side that is finally peeled off from the cathode (smooth side) is the side seen on the surface of the laminate or printed circuit board, and the reverse side (commonly known as the rough side) is the side that needs a series of surface treatments to bond with the resin in the printed circuit board.
3. The principle of electrolysis
During electrolysis, cations in the electrolyte migrate to the cathode, and electrons are obtained at the anode to be reduced. Anions run to the anode and lose electrons to be oxidized. Two electrodes were connected to the copper sulfate solution, and direct current was applied. At this time, it will be found that copper and hydrogen are precipitated on the plate connected to the cathode of the power supply. In the case of a copper anode, the dissolution of copper and the evolution of oxygen occur simultaneously. The response is as follows:
Cathode: Cu2+ +2e → 2Cu
2H+ +2e → H2↑
Anode: 4OH- +4e → 2H2O + O2↑
2S042-+2H2O -4e → 2H2S04 + O2↑
The copper dissolved from the anode supplements the consumption of copper ions in the electrolyte. The surface of the cathode is treated to a certain extent, so that the copper layer deposited on the cathode can be peeled off, and a copper skin with a certain thickness will be obtained. The copper skin with certain functions is called copper foil.