Titanium anode has a certain life span during electrolysis operation. When the voltage rises very high and there is actually no current passing through, the anode loses its function. This phenomenon is called anode passivation.

There are several reasons for anode passivation:

1. The coating is peeling off. The titanium anode is composed of a titanium substrate and an active coating. If the coating and the substrate are not firmly bonded and peel off from the substrate to a certain extent, the titanium anode will lose its function.

2. There are cracks in the coating. Due to the existence of cracks in the active coating, new ecological oxygen is produced on the anode during electrolysis, part of which will be adsorbed on the surface of the electrode, reach the interface of the titanium substrate through diffusion or migration, and be taken by oxygen, and form a non-conductive oxide film with titanium, which will cause reaction. To resistance. Or the titanium substrate is slowly oxidized, and the active coating interface is peeled off by the corrosion coating, resulting in an increase in the anode potential, which further promotes the dissolution of the coating and the oxidation of the titanium substrate.

3. The coating dissolves. There are two cases of coating dissolution: one is that the entire anode surface is uniformly dissolved, and the other is that it is partially dissolved in the anode. When it is dissolved to a certain extent, the electrode is passivated.

4. The oxide is saturated. There are certain oxygen vacancies in the distorted mixed crystal matrix produced by heat treatment of the isomorphous type in the coating. When these oxygen vacancies are filled with oxygen, the overpotential rises rapidly, leading to passivation.

The actual process of passivation of coated titanium anode during electrolysis is very complicated. It is caused by a combination of multiple factors. The working life of the electrode varies significantly with the coating formulation, electrolytic medium, and operating conditions. In view of the passivation of titanium anode, our company has adopted a series of anti-passivation measures. It can greatly extend the life of the anode.