Titanium clad copper and its application in copper electrolysis production

1. Introduction of titanium clad copper rod products
Titanium clad copper rod (also known as: titanium copper composite rod) as the name implies is a biaxial metal composite rod with a certain thickness of titanium layer (generally using a thickness of 1.0㎜-1.2㎜) wrapped around the copper rod, which is mainly divided into round, flat, square, rectangular, drum row, etc. according to its cross-sectional geometry.

2. Application value of titanium-clad copper rods
Titanium clad copper mainly uses the excellent corrosion resistance of the cladding metal - titanium and the good electrical conductivity of the pistil metal - copper, which is used as a conductor carrying large currents under the conditions of stronger corrosion work. Due to the protection of copper metal by the cladding metal, the corrosion of copper conductor is eliminated, ensuring uniform consistency of current density during the production process and improving the quality level of electrolytic products; the conductor is free from cleaning and maintenance, eliminating the contamination of electrolyte due to the corrosion of copper conductor. Some electroplating processes even submerge titanium-clad copper rods in the electrolyte to increase the current density and efficiency. Due to the excellent characteristics of titanium-clad copper rods, the use of this product is bound to bring about improved product quality, increased production efficiency, reduced energy consumption and reduced labor intensity, among other application values.

3. Several important quality requirements for titanium-clad copper rods
Whether the quality of titanium clad copper rod can meet the requirements of strong corrosion, high current working conditions, the initial should meet the technical standards specified in GB/TI2769-2003, in particular, should meet the following requirements:
① Titanium layer thickness should be uniform, which is an important requirement to ensure the service life of titanium clad copper rod, the general titanium layer thickness should be controlled within ± 20% of the nominal thickness of the titanium layer size. Example: If the nominal thickness of titanium layer is 1㎜. The actual thickness should be between 0.8㎜ and 1.2㎜.
②Titanium copper lamination rate is the lamination area. The higher this indicator is, the better its conductivity is, and it should be more than 95% in general. This requirement JB/100G A type pulse reflection ultrasonic flaw detector test.
③ titanium copper bonding strength. In the use of the size of the indicator to determine the titanium copper cladding due to metal thermal expansion and contraction and whether the titanium copper metal delamination of an important factor. In theory, the bonding strength should be tested by shear, but this test method is destructive test, in actual production is generally difficult to use. Before assembling and using, because the titanium-clad copper rod needs to be machined in certain amount, so when the titanium layer is left to 0.3㎜-0.5㎜ during turning and milling, if it does not separate from the base material, it can be judged that the strength of titanium-clad copper lamination is compounded with the use requirements.

4. Application of titanium-clad copper rods in copper electrolytic production
The use of titanium seed plate to produce the starting sheet, because it has the starting sheet easy to peel. Crystallization organization is dense, high cost rate, not easy to short circuit burn plate, light weight, long life and other advantages, in the 1970s in China has begun to replace the copper seed plate, stainless steel seed plate. The application of titanium seed plate has created huge economic benefits for copper smelting enterprises. For a long time, there are still some insurmountable difficulties in the production because there is no ideal way to link the titanium seed plate with the cathode conductive copper rod. At present, the connection of titanium seed plate and cathode conductive copper mainly adopts two methods of lug connection or fastener connection.
Because of the electrolyte generated by the fumes on the conductive copper rod with strong corrosion, resulting in titanium seed plate and conductive copper rod connection parts of the corrosion layer, corrosion layer in the formation process destroyed the conductive properties of copper conductive rod and titanium seed plate, increasing the impedance, reducing the current density, affecting the uniform consistency of the current density, resulting in the beginning of the electrode piece of "flower plate" Phenomenon, the growth rate of the starting pole piece is slow. Although the factories take manual rust removal work, but because the titanium seed plate and the cathode conductive copper rod connection method of the innate reasons, resulting in this unfavorable factor. This disadvantage is always accompanied by the whole