Specific precautions for selecting anti-corrosion flooring materials

Answer:

1. Corrosion resistant materials should not react with the material, contaminate the material, or affect the process flow, especially in industries such as food, medicine, and fiber, such situations are absolutely not allowed. Even highly corrosion-resistant materials with low corrosion rates cannot be used if they have an impact on the color, aroma, and taste of the product;

2. When selecting materials, attention should also be paid to the composition of corrosive media and the impurities they contain. When selecting materials, people often only pay attention to the main components and ignore impurities. In fact, there are many examples that show that trace impurities are the main factor of corrosion. For example, crude oil, gasoline, and petroleum products contain small amounts of sulfur, leading to a significant increase in corrosion. The presence of trace amounts of sulfur dioxide and hydrogen sulfide in the atmosphere greatly enhances its corrosiveness and can also cause stress corrosion cracking in equipment and buildings;

3. In addition to considering the main medium and trace impurities, attention should also be paid to substances such as microorganisms and mold algae. For example, sulfate reducing bacteria are an important factor causing corrosion of oil and soil. Corrosion caused by mold and algae is often encountered in underground oil pipelines, water pipelines, gas pipelines, and cooling towers;

4. When designing anti-corrosion engineering, attention should be paid to the temperature and pressure fluctuation range of the medium, and special circumstances should also be considered. If the application temperature exceeds the specified range, the material cannot be used; The increase in pressure will accelerate the penetration and damage of corrosive media to anti-corrosion materials; When there is a large temperature difference, attention should be paid to the bonding strength of composite anti-corrosion materials. When the expansion stress is greater than the bonding strength, the lining layer is prone to detachment, causing leakage and damage to the medium corrosion substrate;

5. For certain highly abrasive media, such as solid powders or solid-liquid mixtures that are flowing or subjected to external forces (such as stirring), the use of corrosion-resistant materials with excellent wear resistance should be considered;

6. In building anti-corrosion engineering, attention should be paid to the composition and moisture content of industrial atmosphere. Acidic gases accelerate corrosion of buildings and equipment under high humidity conditions. Some factories are located by the seaside, and the acidic gases in the atmosphere contain salt spray;

7. The composition of industrial wastewater is very complex, mainly consisting of acidic wastewater containing organic matter, which corrodes cement products and causes leakage. Many cooling towers, sewage tanks, aeration tanks, large storage tanks, and neutralization tanks in some refineries are made of cement. Various large pools and cooling towers made of new concrete were corroded and cracked by acidic sewage within a few years due to lack of attention to corrosion prevention.