The main advantages of titanium anode and the main role of the metal oxide layer on the titanium anode

First, titanium anode details:

The full name of titanium anode is Titanium oxide coated titanium anode (MMO). Also called KSA anode. (Size shape stable anode). The titanium substrate is coated with precious metal to make it have good electrocatalytic activity and conductivity.

Titanium anode classification:

According to the anode precipitation of gas in the electrochemical reaction to distinguish, the precipitation of chlorine gas is called chlorine evolution anode, such as ruthenium-coated titanium electrode: the precipitation of oxidation is called oxygen evolution anode, such as iridium coated titanium electrode and platinum titanium net/plate.

Chlorine evolution anode (ruthenium-coated titanium) :

Electrolyte chloride content is high: generally in the environment of hydrochloric acid and electrolytic seawater, electrolytic salt water environment. Such as ruthenium-iridium titanium anode, ruthenium-iridium tin titanium anode.

Oxygen evolution anode (Iridium series coated titanium electrode) :

Electrolyte is generally sulfuric acid environment. Iridium tantalum anode, iridium tantalum tin anode, high iridium anode.

Platinum-plated anode (platinum titanium mesh/platinum titanium plate) :

Titanium as the base material. The surface is plated with precious metal platinum, and the coating thickness is generally 1-5um (micron). Platinum titanium mesh size is generally 12.7*4.5mm or 6*3.5mm.

Two, titanium anode advantages:

At present domestic titanium anode mainly brush coating. This electrode has a very wide range of applications, titanium anode with its light and flexible production process, also known as DSA anode, compared with similar anode titanium anode superior performance has the following points;

1. The anode size is stable, and the distance between electrodes does not change during the electrolytic process, which can ensure that the electrolytic operation is carried out under the condition of stable tank voltage.

2, low working power, small power consumption, DC power consumption can be reduced by 10-20%.

3. Titanium anode has long working life and strong corrosion resistance.

4, can overcome the graphite anode and lead anode dissolution problem, avoid the pollution of electrolyte and cathode products, thus can improve the purity of metal products.

5, the current density is high, the overpotential is small, the electrode catalytic activity is high, can effectively capture high production efficiency.

6, can avoid the lead anode deformation after short circuit problem, improve the current efficiency.

7. The shape is easy to make and can be high-precision.

8. The titanium matrix can be reused.

9, low over potential characteristics, the electrode surface and electrode bubbles are easy to eliminate, can effectively reduce the electrolytic cell voltage.

Electrodeposition metal extraction is a method of preparing pure metal by cathode reduction of metal ions to be extracted from the electrolyte after leaching and purification. It is composed of Ti matrix, the precious metal coated on it and/or the precious metal oxide electrochemically active layer.

In electrolytic metallurgy, the conventional lead alloy anode can be replaced. Under the same conditions, the voltage can be reduced and the power consumption can be saved. For example, electrolytic zinc production has been using lead alloy anodes containing small amounts of silver, antimony or calcium. The following problems often occur: lead alloy electrode size is not stable; Oxygen evolution potential is too high (about 800mV); Corrosion occurs when the anode is polarized. Lead ions dissolve in the electrolyte and deposit on the cathode, contaminating metal zinc and affecting product quality. Titanium anode for electrodeposition metal can overcome the disadvantages of lead alloy anode and adapt to the electrodeposition conditions of high current density and narrow electrode spacing. Not only suitable for sulfate system, but also suitable for chlorine salt system and sulfate and chloride mixed system.

Three, titanium anode on the role of metal oxide coating:

By covering different coatings, the conductive property and electrocatalytic activity are enhanced, the electrolytic reaction process is promoted and the service life of the anode is extended under different use environment, so as to achieve the expected use effect.

Thickness of metal oxide coating on titanium anode

Electrochemical catalytic reaction is mainly the coating of precious metal, only precious metal content to meet the requirements to ensure the normal work of anode products. Thickness is only a representation, mainly by the number of brushes and solvent concentration, and the amount of precious metal content is not directly related, too thick coating is easier to fall off.