The electrochemical catalytic performance of screw titanium coating is mentioned above, which is an important application field, titanium screw surface coating. Titanium itself has high-quality corrosion resistance, relatively low price, and high strength. The surface of titanium screws is coated with a layer of active metal, usually a precious metal or a precious metal oxide, and the titanium coating becomes the anode. Titanium screw anodes are widely used in other chemicals, chlor-alkali, cathodic protection projects, and insoluble anodes.
Spiral platinum-plated titanium anode has many years of history. The method of platinum-plated titanium screws is electroplating (molten salt electroplating) and thermal decomposition, and can also be directly coated, such as explosive composite. Cyanide platinum plating is usually in a molten salt tank. The cyanide tank rate is 53% potassium cyanide and sodium cyanide and the temperature of 47% is 520℃. Platinum serves as a soluble anode. The thickness of the coating is 1500um, and the deposition rate is 20-25um/h. The platinum plating scheme has a low deposition rate and no thick coating can be obtained.
The water silver plating process is simple and easy to operate, but the thickness of the coating is usually no more than 2.5. If you use the pulse plating process, you can get 3-6mm thick bright platinum coating. The solution uses H2Pt(NO2)z2S04, each liter of the solution contains platinum 5-l0g, sulfuric acid adjusts the pH to 1.2 2, the temperature is 50°C, the current wave shape of the cloud, breaks the ratio of 5-9, and the average current density is 50-100/square Meters, pure platinum anode. Titanium has a very low price in chloroiridium chloride and platinum coatings, and more attention is paid to the research and application of screw titanium anodes. The electrode prepared by thermal decomposition is similar to the preparation of a rust-oxide electrode. The volume ratio of the mixture of butanol and anisole dissolved chloroplatinum and iridium is 3:1, and the weight ratio of platinum and iridium is 6:4. The titanium alloy is coated and mixed, dried and then heated at 500°C to form a thin film. Such a total needs to be repeated several times until the desired thickness is reached, and the thickness is usually controlled at about 20 g/m2.
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