Requirements for anti-corrosion coatings on carbon steel water cooler tube bundles

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Requirements for anti-corrosion coatings on the tube bundles of carbon steel water coolers 1. Overview Carbon steel cooling equipment is one of the essential and important devices 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. 2. Function and principle of the anti-corrosion coating on carbon steel water coolers. Corrosion and scaling of carbon steel water coolers have always been problems that are difficult to resolve in petrochemical enterprises. 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 feasible. 3. Coating requirements: The anti-corrosion principle of non-metallic coatings is to isolate metal equipment from corrosive agents; this not only improves corrosion resistance but also helps to save a large amount of precious metals and alloys. Coatings should meet the following requirements: (1) The coating itself must be resistant to corrosion in the relevant 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 across the entire protective surface and has a certain thickness. (5) For the heat exchanger core, it should also have little impact on the heat transfer efficiency and possess scale-inhibiting properties.