Functions, principles, and requirements of the anti-corrosion coating on carbon steel water coolers

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This post was last edited by Wang Wei2 on 2024-10-26 09:20. Carbon steel heat exchangers are one of the essential equipment in petrochemical enterprises. Corrosion and scaling in carbon steel heat exchangers, as well as the resulting decline in heat transfer efficiency and tube bundle leakage, severely affect the normal production and profitability of enterprises. 1. Function: Corrosion and scaling of carbon steel water coolers have always been difficult problems for petrochemical enterprises to solve. There are many methods to prevent corrosion, such as proper material selection, rational design, electrochemical protection, surface coatings, improving operating conditions, the use of corrosion inhibitors, and scientific management. Using stainless steel tube bundles is too costly, and the Cl‑ ions in the medium will damage the passivation film, resulting in poor performance. The application technology of electrochemical protection in heat exchange equipment in refineries is not yet mature. Considering both the comprehensive protection effects and economic benefits, the use of a non-metallic coating method is highly practical. 2. Principle: The corrosion prevention principle of non-metallic coatings is to isolate metal equipment from corrosive agents; it not only improves corrosion resistance but also helps to save a large amount of precious metals and alloys. 3. Requirements: (1) The coating itself must be corrosion-resistant in the medium. (2) It has a tight structure, is completely pore-free, and cannot be penetrated by the medium. (3) It has a strong adhesion to the base metal. (4) It is evenly distributed over the entire protective surface and has a certain thickness. (5) For the heat exchanger core, it should also have little impact on heat transfer efficiency and possess scale-inhibiting properties.