What is the application of insoluble electroplated titanium anode?
1. Chromium plating (hexavalent chromium, trivalent chromium): the types of chrome plating are:
① Protection - decorative chrome plating, which can prevent the base metal from rusting, and has a decorative bright appearance, widely used in automobiles, bicycles, sewing machines, clocks, instruments, measuring tools, daily hardware and other parts;
②Hard chromium (wear-resistant chromium), mechanical parts are plated with hard chromium, which can improve wear resistance and prolong service life;
③ Milky white chromium plating, milky white chrome plating has small pores and good corrosion resistance, while hard chrome is slightly lower. Adding bright and wear-resistant chromium plating on milky white chromium plating can not only improve corrosion resistance but also achieve wear resistance, it is called Protection - wear-resistant double-layer chrome plating, widely used in aircraft, ship parts and gun bores;
④ loose hole chrome plating layer;
⑤ black chrome plating, etc. The anode materials used in chrome plating include DSA titanium anode, PbSn, PbAg, graphite, and titanium-based lead dioxide electrodes, all of which have the ability to oxidize chromium ions into chromate ions. When the insoluble titanium anode is used, the oxidation overpotential of the anode is about 450mV lower than that of the lead electrode, which saves power consumption. At the same time, the titanium anode can operate at a high current density, and has a long service life. The chromium plating layer is firmly combined with the substrate, and the surface is bright and clean.
Trivalent chromium plating has bright white color, high hardness and excellent mechanical properties. Its dispersion and covering ability are much higher than hexavalent chromium. Under the same current density, its deposition rate is twice that of hexavalent chromium plating. times, and the current efficiency is also very high. However, the main advantage of trivalent chromium plating is that its toxicity is only 1/100 of that of hexavalent chromium, and it is easy to handle. one. However, trivalent chromium electroplating also has some problems, mainly because its impurity tolerance is very low, so its stability is not good, and it cannot even be put into practical production and application. The hexavalent chromium ions produced at the anode will seriously affect the quality of the coating, so that qualified products cannot be plated at all. For example, if zinc, copper and nickel accumulate in the trivalent chromium plating bath to a concentration of 10-100ppm, the quality of the coating will decrease. According to the general bath ratio, it is not possible to plate a thick chromium layer, etc. These problems of trivalent chromium plating seriously restrict its promotion and application. However, in recent years, the research on trivalent chromium electroplating technology has made great progress, breakthroughs have been made in overcoming hexavalent chromium, impurity pollution and realizing thick coatings, and long-term stable trivalent chromium electroplating has been achieved. It has been put into production and application on a large scale, and has achieved good economic and environmental benefits. During trivalent chromium plating, hexavalent chromium ions will be produced due to the oxidation of the anode. Hexavalent chromium ions seriously affect the quality of the coating, increasing the tank pressure, so that electroplating cannot be performed. Therefore, it is necessary to try to prevent the influence of hexavalent chromium ions on trivalent chromium plating. JM-TITANIUM has developed an insoluble titanium anode for trivalent chromium electroplating. After being used by many manufacturers, the oxidation of trivalent chromium by the anode is very low. The product quality and performance are comparable to foreign products, and the price is lower than similar foreign products;
2. Rhodium plating: The rhodium plating layer is silvery white. Up to now, the vast majority of germanium plating process uses rhodium sulfate plating solution, which is mainly used in jewelry industry, sliding and rotating contacts, printed circuit switches, communication equipment and high-frequency switching components. The rhodium plating solution containing selenic acid and the germanium plating solution containing magnesium sulfamate have low coating stress. Using these plating solutions, a coating with a thickness of 25 μm can be obtained. Generally, the thickness of the rhodium coating is required to be 0.1 to 0.2 μm in industry. In the rhodium plating process, platinum, titanium-based platinized and DSA-coated titanium anodes can be used.
3. Palladium plating: Palladium plating is silvery white. In the 1970s, in the electronics industry, the electroplating process of replacing gold with palladium was rapidly developed. The most commonly used palladium plating solution is ammonia system, and palladium exists in the form of ammonia complex, such as Pd(NH3)2(NO2)2 (commonly known as P salt), Pd(NH3)2Cl2. Generally, palladium coatings are easier to obtain, but they are often prone to cracks, because within the potential range of electrolytic palladium, hydrogen often produces a common electrodeposition phenomenon, which makes the palladium coating absorb hydrogen, and the hydrogen gas will slowly release during the placement process to form a coating. cracks. Palladium-plated anodes can use platinum, titanium-based platinum-plated, DSA titanium anodes.
4. Gold plating: As a precious metal, gold has excellent characteristics such as good solderability, oxidation resistance, corrosion resistance, small contact resistance, and good wear resistance of alloys; currently used gold plating solutions include cyanide gold plating solution and Cyanide-free gold plating solution, such as circuit board electroplating is mainly citric acid gold bath, which is widely used because of its simple maintenance, simple and convenient operation; gold-plated anodes originally used pure gold, platinum, titanium
Platinum-based and 316 stainless steel; platinum-based and titanium-based platinum-plated electrodes in the gold plating process have the following problems: ① Oxidize - - valent gold ions to trivalent gold ions, reducing current efficiency; ② Oxidize citric acid buffer, destroy the plating solution Stability; ③Platinum and titanium-based platinum-plated electrodes are expensive, almost twice as much as DSA coated electrodes; stainless steel 316 is easy to dissolve, causing metals such as nickel, iron, and chromium to contaminate the gold cylinder, resulting in whitening, exposed plating, and blackening of the gold plating. Defects; DSA titanium anode can overcome the defects of the above-mentioned anodes, and it is really high quality and low price.
5. Ruthenium plating: Ruthenium has high hardness and wear resistance. It is very meaningful to use ruthenium plating to replace expensive rhodium plating for electrical contacts. But domestic until recently, its application is still very little. Ruthenium-plated anodes can use platinum, titanium-based platinum-plated, and DSA-coated titanium anodes.
6. Nickel plating and nickel foam production: In the production of nickel plating and nickel foam, the cathode and anode current efficiency does not match, resulting in a gradual increase in the concentration of nickel ions in the plating solution, which affects the quality of nickel plating and nickel foam. In order to match the current of the cathode and the anode Efficiency requires the use of insoluble auxiliary anodes. The anodes that can be used include platinum, titanium-based platinum-plated, and DSA-coated titanium anodes.
Baoji JM-TITANIUM—Professional anode design and manufacturer
Over the years, we have been specialized in anode research and development, production and manufacturing, and our products are exported to many countries around the world. Various series of anodes can be designed and produced according to the actual environmental parameters of different users. You are welcome to visit and negotiate.
Nicole
Company: Baoji Jimiyun Dynamic Co., Ltd
Cuntry:China
Add:Baoti road,Jintai,Baoji city,Shaanxi,China
Cel:+86 13369210920
Gmail:nicole@jmyunti.com
Website:www.jm-titanium.com
