Titanium Anode for Copper Foil

Titanium Anode for Copper Foil

Special coating titanium anode for electrolytic copper foil

Substrate: pure titanium Gr1

Coating: Iridium series (selected according to the electrode usage environment and life requirements provided by customers)

Early copper foil electrodes used lead-based alloy anodes and stainless steel electrodes, but were gradually replaced by coated titanium anodes due to their defects. The electrolytic copper foil industry uses an arc-shaped electrolytic cell to manufacture copper foil by electrolytic copper sulfate solution. Copper is plated on a titanium rotating cylinder cathode with a diameter of 2-3 meters, and the copper foil is peeled off at one end of the rotating cylinder; the anode is away from the cathode The distance between the rollers is as small as 5 mm, but it must be ensured that a thin copper foil of uniform thickness is deposited on the smooth cathode roller. Due to the stringent requirements for quality and performance of the product, the stability of the electrolytic conditions in production is strict, and the anode must carry a huge current. The coated titanium electrode has the advantages of light weight, long service life, high current supply, stable operation, and no environmental pollution. It is widely used in the world.

The pretreatment of electrolyzing copper foil---Titanium Anode 1.Electrolyte ：H2SO4（30%）+CuSO4 2.Current Density：3000A/M 3.Working Temperature：60℃ 4.Service Life：≥2 Years（40 million hours） 5.Ph Value：Highly Acidic 6.Main Compositions：IrO2+X

Electrolytic extraction of metals in sulfuric acid solution, oxygen is precipitated on the anode, the choice of the appropriate anode material is a very important issue. Using tantalum-iridium-coated titanium electrode, the oxygen overpotential is low, and it is not corroded by the electrolyte. The iridium oxide coating shows excellent electrolytic durability. The initial anode potential was 1.51V, after 6000 hours, it was 1.64V, and the coating weight loss was 0mg/cm2.

When using lead-based alloy electrodes (containing Sb6% to 15% or Ag1%) in electrolytic production, the lead anode will dissolve, consuming the anode material, affecting the anode service life, and the lead dissolved in the solution will be on the cathode Precipitation increases lead impurities in the metal and reduces product quality. The ruthenium-based coating will be seriously damaged under this condition, so it is not suitable for use. The initial anode potential was 1.48V. After 1000 hours, it rose to 2.0V and the anode has been passivated.

Principle of electrolysis

During electrolysis, cations in the electrolyte migrate to the cathode, and the electrons obtained on the anode are reduced. The anions run towards the anode and lose electrons to be oxidized. Connect two electrodes in a copper sulfate solution, and pass a direct current. At this time, it will be found that copper and hydrogen are deposited on the electrode plate connected to the cathode of the power supply. If it is a copper anode, dissolution of copper and precipitation of oxygen occur simultaneously. The reaction 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 cathode surface is subjected to certain treatments so that the copper layer deposited on the cathode can be peeled off, and a certain thickness of copper skin will be obtained. Copper foil with certain functions is called copper foil.

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