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Sewage treatment equipment anti-corrosion measures

What is Sewage treatment equipment anti-corrosion measures? It is understood that the hospital sewage treatment equipment, anti-corrosion measures often use these methods, such as surface treatment, metal coating and coating, lining aspects of the treatment, the specific measures are as follows.
    1, surface treatment
    Metal contact with the use of the environment before using passivation agent or film-forming agent, the surface to generate a stable and dense passivation film, corrosion resistance greatly increased. It is different from the corrosion inhibitor method in that it does not need to be added with corrosion inhibitors in later use environments. After anodized aluminum, the surface can generate a denser film than in the atmosphere, Gentle corrosion environment has excellent corrosion resistance, blue steel parts surface is also the principle.
    2, metal coating and coating
    Available in a thin layer of steel on the bottom of the more corrosion-resistant metal protection. Commonly used method is electroplating, generally plated 2 to 3 layers, only a few tens of microns thick, and thus inevitably exist micropores, the solution can penetrate the micropores, will form a coating - the bottom of the corrosion cell. If the coating is precious metal, its potential is higher than iron, will become a cathode, will accelerate the underlying iron corrosion. Therefore, this type of coating is not suitable for strong corrosive environment, but can be used in the atmosphere, water and other environments, slow corrosion products can plug the pores, the resistance increases, access to a certain life.
    3, coating
    With organic coatings to protect the metal structure of the atmosphere, is the most extensive means of preservation. The coating covers the metal surface and forms a porous film after drying. Although the metal can not be completely isolated from the medium, the corrosion resistance is reduced by increasing the diffusion resistance and solution resistance through the pores. In mild environments, such as the atmosphere, seawater, etc., the microporous bottom metal corrodes slowly and corrosion products can clog the micropores, which has a long service life but is not suitable for aggressive solutions because the metal corrodes faster and with Hydrogen production, will make the film rupture.
    4, lining
    Lining is generally the whole piece of material, suitable for contact with the strong corrosive medium inside the device. Such as hydrochloric acid, dilute sulfuric acid tank will be lined with rubber or plastic, storage of nitric acid steel tank lining with stainless steel sheet and so on. Enamel is actually a kind of glass lining, which is called enamel glass in the industry. It is acid-resistant and widely used in food, medicine and other industries to ensure the quality of products, but it can not be fired too much.

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