How to test the corrosion resistance of the material of methyl methacrylate reactor?

Methyl Methacrylate (MMA) is an important chemical raw material, which is widely used in plastics, coatings, adhesives and other fields. In the production process, MMA reactor is one of the key equipment, the choice of its material directly affects the service life and production efficiency of the reactor. Because MMA has a certain degree of corrosion resistance, it is particularly important to test the corrosion resistance of the reactor material. This article will discuss the corrosion resistance test method of methyl methacrylate reactor material in detail to help related companies choose suitable materials.

Basic properties and corrosion characteristics of 1. methyl methacrylate

methyl methacrylate is a colorless and transparent liquid with a slight pungent odor. It is flammable, easily oxidized, and corrosive to certain metals and non-metallic materials. In the reactor, MMA may react with water, oxygen or other chemicals to produce corrosive by-products. Therefore, when selecting the material of the reactor, the corrosion resistance of the material at high temperature, high pressure and containing chemical substances must be considered.

Test method for corrosion resistance of 2.

1. Corrosion performance test

the corrosion performance test of materials is an important means to evaluate their corrosion resistance. Common corrosion performance testing methods include:

• immersion test: Soak the material sample in MMA solution and observe its corrosion within a certain period of time. The corrosion resistance of the material was evaluated by recording the weight change, surface morphology change and other indicators of the sample.
• electrochemical test: Electrochemical methods (such as polarization curve test) are used to measure the electrochemical behavior of materials in MMA solution and analyze their corrosion tendency.
• Salt spray test: Although it is mainly used to simulate corrosion in salt spray environment, it can also be used to test the corrosion resistance of materials in environments containing corrosive media (such as MMA) in some cases.

1. Material surface characteristic test

the surface characteristics of the material directly affect its corrosion resistance. Through the surface characteristic test, the corrosion resistance of the material surface can be evaluated:

• surface roughness test: Materials with rough surfaces are more susceptible to corrosion, so it is necessary to measure the surface roughness of the material to select a suitable material.
• surface chemical composition analysis x-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) were used to analyze the chemical composition of the material surface and evaluate its stability in MMA environment.
• Surface coating test: If there is a coating on the surface of the material, the corrosion resistance of the coating can be evaluated by coating adhesion test, wear resistance test and other methods.

1. Monitoring and evaluation in actual use

in actual use, the corrosion resistance of the material can be evaluated by monitoring the corrosion of the reactor:

• periodic inspection regularly check the surface of the reaction kettle to observe whether there is corrosion, rust or peeling.
• corrosion product analysis: If corrosion is found, the composition of the corrosion product can be analyzed to find out the root cause of corrosion.
• Maintenance Records: By recording the maintenance history of the reactor, evaluate the corrosion resistance of the material, and provide a reference for subsequent material selection.

3. how to choose suitable for methyl methacrylate reactor material

when choosing a suitable reactor material, it is necessary to consider the corrosion resistance, mechanical properties, processing performance and cost of the material:

• stainless Steel: Stainless steel is a commonly used corrosion-resistant material, but it is necessary to select the appropriate type of stainless steel according to the specific corrosive medium. For example, 316L stainless steel performs well in a variety of corrosive media.
• titanium alloy titanium alloy has excellent corrosion resistance, especially in high temperature and strong corrosive environment. But its cost is high and may not be suitable for all occasions.
• Ceramic lining: Ceramic lining can be applied to the reactor by coating or lining, providing excellent corrosion resistance and high mechanical strength.
• Other corrosion-resistant materials plastic materials such as polypropylene (PP) and polytetrafluoroethylene (PTFE) are also commonly used in the manufacture of reaction kettles or linings, especially for corrosive media.

4. Summary

the corrosion resistance test of methyl methacrylate reactor is the key link to ensure the long-term stable operation of the reactor. Through corrosion performance testing, material surface characteristics testing and monitoring and evaluation in actual use, we can fully understand the corrosion resistance of materials and select suitable reactor materials. In the future, with the development of material science, more new materials with excellent corrosion resistance may appear, which will provide more reliable equipment support for the production of methyl methacrylate.