Pure titanium is mainly used as an auxiliary electrode (or counter electrode, cathode) and pendant in anodizing plants.
1. As an auxiliary electrode (cathode)
In the anodizing process, the aluminum parts to be treated are used as the anode, while pure titanium is usually used as the cathode.：
Electrical conductivity: Titanium has excellent electrical conductivity, can stably conduct current, and ensure uniform distribution of current during oxidation.
Corrosion resistance: Titanium has extremely high corrosion resistance in sulfuric acid, oxalic acid and other anodizing electrolytes, is almost insoluble, and its life span far exceeds that of stainless steel or graphite electrodes.
Stability: A dense oxide film (titanium dioxide) will form on the surface of the titanium to protect the substrate from further corrosion and avoid contaminating the electrolyte.
2. As a pendant or fixture
Used to fix aluminum parts and power on：
Lightweight and sturdy: titanium has high strength and light weight, which is suitable for making hanging tools.
Insulation treatment: The contact part of the titanium pendant and the aluminum parts needs to be insulated (such as coating), and only the conductive points are exposed to avoid unnecessary oxidation consumption.
Reuse: It has strong corrosion resistance, can be used for a long time, and reduces maintenance costs.
3. Special application: titanium basket
In electroplating or electroless plating before anodizing, the titanium basket can hold metal balls (such as copper and tin) as a soluble anode to supplement the metal ions in the electrolyte.
4. Summary of advantages
Long life: there is almost no loss in an acidic environment, and there is no need to replace it after several years of use.
Energy saving and environmental protection: reduce electrode replacement and shutdown time, and reduce the risk of waste liquid pollution.
Cost-effectiveness: Although the initial investment is high, the long-term maintenance cost is low.
The excellent properties of pure titanium make it an indispensable auxiliary material in the anodizing industry, especially in high-end electronics, aerospace and other fields with strict surface treatment requirements. It is widely used.
