Regarding molten salt corrosion, in fact, it can be defined as: metal corrosion of metal materials in molten salt. So what are the types of anti-molten salt corrosion coatings? Let's take a look at it together, I hope it will help you!

Because molten salt has good thermal stability, fluidity, high thermal conductivity and high electrical conductivity, it is widely used in industry.

For example, it is often used as a high temperature carrier and electrolyte in the chemical industry. Used as a solvent and coolant for nuclear fuel in some nuclear reactors. Any device using molten salt can corrode metal materials.

Molten salt corrosion methods can be divided into two categories:

One is that the metal is oxidized into metal ions, which has the same electrochemical corrosion process as the aqueous solution corrosion. This is the main method of molten salt corrosion. The potential difference between the anode and the anode is the driving force of the corrosion reaction, and the migration speed of the oxidant is controlled. The reaction speed of the whole corrosion.

The other type is dissolved in molten salt in a metallic state without oxidation, such as the corrosion of lead immersed in lead chloride molten salt. When there is a temperature gradient in the metal-molten salt system, temperature difference mass transfer corrosion occurs, the metal in the high temperature part is dissolved, and the metal in the low temperature part is separated from the molten salt. This reciprocation can cause reverse corrosion at high temperature parts and blockage at low temperature parts.

Even under isothermal conditions, because the useful metal materials are mostly alloys, the more active components in the alloys often undergo selective corrosion when they come into contact with molten salts. Preventive measures The primary way to avoid or slow down the corrosion of molten salt is to remove the air and moisture in the molten salt or slow down the dispersion and relocation of oxygen and moisture in the molten salt; rational selection of materials, electrochemical protection.