Due to the wide variety of modern industrial media, harsh process conditions, and the variety and performance of corrosion-resistant materials, it is very important to choose the right materials. Suitable materials not only ensure the normal operation of the equipment, give full play to the service life of the material, but also have an economical effect.
In the "material environment" system, the requirements for materials are:
1, chemical properties or corrosion resistance to meet production requirements;
2, physical, mechanical and processing process performance to meet the design requirements;
3. The overall economic effect is superior.
Anti-corrosion floor material should pay attention to the following seven points:
1. The corrosion-resistant materials should not react with the materials, do not contaminate the materials, and do not affect the process flow, especially in the food, medicine, fiber, and other industries. Even highly corrosion-resistant materials with low corrosion rates cannot affect the color, fragrance and taste of the product.
2, when selecting the material also pay attention to the composition of the corrosive medium and impurities contained. When selecting materials, people often pay attention only to the main components while ignoring impurities. In fact, many examples show that trace impurities are the main factors of corrosion. For example, crude oil, gasoline, and petroleum products contain a small amount of sulfur, and corrosion has increased dramatically. The presence of trace amounts of sulfur dioxide and hydrogen sulfide in the atmosphere also greatly increases corrosivity and can also cause stress corrosion cracking in equipment buildings.
3, in addition to taking into account the main medium and trace impurities, but also to pay attention to substances such as microorganisms and moldy algae. For example, sulfate-reducing bacteria are an important factor that causes oil and soil corrosion. The corrosion of moldy algae is often encountered in underground oil pipelines, water pipelines, gas pipelines and cold water towers;
4, in the anti-corrosion engineering design, we must pay attention to the medium temperature, pressure fluctuation range, but also take into account the special circumstances. Exceeding the application temperature range of the material, the material can not be applied; and the increase of the pressure will accelerate the corrosion and corrosion of the corrosion medium to the anticorrosive material; when the temperature difference is large, the adhesive strength of the composite anticorrosion material should be paid attention to when the expansion stress is greater than the adhesion. In strength, the lining is easily detached and causes leakage, resulting in the destruction of the dielectric corrosion matrix;
5. Some severely abrasive media, such as solid powders, solid-liquid mixtures that are flowing or subjected to external forces (such as agitation), should be considered for corrosion resistant materials with good abrasion resistance;
6, in the construction of anti-corrosion projects, pay attention to the composition of the industrial atmosphere and moisture content, acidic gases in the case of high humidity, corrosion of buildings and equipment to accelerate. Some factories are located on the seashore, and acidic gases in the atmosphere contain salt fog.
7. The composition of industrial sewage is very complicated. It is mainly acidic wastewater containing organic matter and causes leakage of cement products. For example, many cold water towers, cesspools, aeration tanks, large storage tanks, and neutralization tanks in some refineries are made of cement. New large concrete tanks and cold water towers made of new concrete, due to no attention to anti-corrosion, were corroded and leaked by acidic sewage in a few years.
From the above points, we can see that the selection of materials has a direct link to the quality of the anti-corrosion floor, so this link should not be ignored for friends who meet on the floor!
In the "material environment" system, the requirements for materials are:
1, chemical properties or corrosion resistance to meet production requirements;
2, physical, mechanical and processing process performance to meet the design requirements;
3. The overall economic effect is superior.
Anti-corrosion floor material should pay attention to the following seven points:
1. The corrosion-resistant materials should not react with the materials, do not contaminate the materials, and do not affect the process flow, especially in the food, medicine, fiber, and other industries. Even highly corrosion-resistant materials with low corrosion rates cannot affect the color, fragrance and taste of the product.
2, when selecting the material also pay attention to the composition of the corrosive medium and impurities contained. When selecting materials, people often pay attention only to the main components while ignoring impurities. In fact, many examples show that trace impurities are the main factors of corrosion. For example, crude oil, gasoline, and petroleum products contain a small amount of sulfur, and corrosion has increased dramatically. The presence of trace amounts of sulfur dioxide and hydrogen sulfide in the atmosphere also greatly increases corrosivity and can also cause stress corrosion cracking in equipment buildings.
3, in addition to taking into account the main medium and trace impurities, but also to pay attention to substances such as microorganisms and moldy algae. For example, sulfate-reducing bacteria are an important factor that causes oil and soil corrosion. The corrosion of moldy algae is often encountered in underground oil pipelines, water pipelines, gas pipelines and cold water towers;
4, in the anti-corrosion engineering design, we must pay attention to the medium temperature, pressure fluctuation range, but also take into account the special circumstances. Exceeding the application temperature range of the material, the material can not be applied; and the increase of the pressure will accelerate the corrosion and corrosion of the corrosion medium to the anticorrosive material; when the temperature difference is large, the adhesive strength of the composite anticorrosion material should be paid attention to when the expansion stress is greater than the adhesion. In strength, the lining is easily detached and causes leakage, resulting in the destruction of the dielectric corrosion matrix;
5. Some severely abrasive media, such as solid powders, solid-liquid mixtures that are flowing or subjected to external forces (such as agitation), should be considered for corrosion resistant materials with good abrasion resistance;
6, in the construction of anti-corrosion projects, pay attention to the composition of the industrial atmosphere and moisture content, acidic gases in the case of high humidity, corrosion of buildings and equipment to accelerate. Some factories are located on the seashore, and acidic gases in the atmosphere contain salt fog.
7. The composition of industrial sewage is very complicated. It is mainly acidic wastewater containing organic matter and causes leakage of cement products. For example, many cold water towers, cesspools, aeration tanks, large storage tanks, and neutralization tanks in some refineries are made of cement. New large concrete tanks and cold water towers made of new concrete, due to no attention to anti-corrosion, were corroded and leaked by acidic sewage in a few years.
From the above points, we can see that the selection of materials has a direct link to the quality of the anti-corrosion floor, so this link should not be ignored for friends who meet on the floor!
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