Titanium Anode Plate In Electroplating Application
The precious metal oxide coating titanium anode is made by coating the precious metal iridium salt on the titanium substrate and then sintering at high temperature. It is widely used in electroplating (electroplating copper, nickel, cobalt, gold, zinc, etc.), electrolysis (electrolytic copper, nickel, palladium) , Rhodium, etc.) and other hydrometallurgical industries. The preparation and application of noble metal oxide-coated titanium anodes have been quite mature, with a history of more than 40 years. Compared with the traditional platinum plating electrode applied to alkaline copper, the advantages of titanium anode are as follows:
1. High current efficiency, excellent corrosion resistance, long anode service life, and high current density (up to 10000A/M2).
2. Energy saving: As we all know, the platinum-plated electrode is an electrode with high over-oxygen potential (1.563V, relative to mercury sulfate), while the noble metal oxide-coated titanium anode is a kind of low oxygen evolution over-potential (1.385V relative to mercury sulfate) Electrode, in the anode oxygen evolution zone more easily oxygen evolution. Therefore, during electrolysis, the cell pressure is relatively low, which saves electricity. This phenomenon has been clearly manifested in the alkaline copper plating bath after copper foil treatment.
3. No pollution: Noble metal oxide coating titanium anode coating is a ceramic oxide of noble metal iridium. This oxide is a fairly stable oxide, almost insoluble in any acid and alkali, and the oxide coating is only 18-40 ?m, the overall coating has a small amount of oxide. Therefore, the precious metal oxide-coated titanium anode will not pollute the electroplating solution, which is basically the same as the platinum-plated electrode.
4. High cost performance: In order to achieve the same service life of platinum-plated electrodes (coating thickness 3.5μm), the price of precious metal oxide-coated titanium anodes is about 80% of that of platinum-plated electrodes. The noble metal oxide-coated titanium anode has better electrochemical stability in alkaline copper electroplating electrolyte, and it has excellent electrocatalytic activity and durability. The cost analysis of the precious metal oxide-coated titanium anode and Pt electrode of Baoji Qixin Titanium Industry Co., Ltd. shows that the precious metal oxide-coated titanium anode is economical.
5. In the printed circuit board industry, the electroplating of copper requires pulse cycle reverse current (PPR). We know that in an environment containing chloride in the sulfuric acid system, the platinum layer will peel off after a platinum-plated titanium anode works for a period of time. However, the use of precious metal oxide-coated titanium anodes can effectively improve this phenomenon.
6. Low maintenance cost: Compared with traditional soluble electrodes (graphite and lead alloy electrodes), noble metal oxide-coated titanium anodes do not need to stop production frequently to clean, replenish anodes, or frequently replace anode bags and renew anodes. Coating, so that productivity is increased and labor costs are reduced;
7. Under the same working conditions, the life of the precious metal oxide-coated titanium anode depends on the working current density, temperature and bath composition.
