Generally, coatings are used for anti-corrosion in heat exchangers; how can carbon steel tube bundles be coated effectively?
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The image below shows the tube bundle for corrosion protection in petrochemical heat exchangers, showing the results after 5 years of use. What coating technology is currently used for tube bundles to ensure a service life of over 4 years?
To improve the corrosion resistance of carbon steel tube bundles through coating, the following steps are recommended: 1. Surface treatment: First, sandblast or mechanically grind the tube bundles to remove rust, oil, and old coatings, achieving a cleanliness level of Sa2.5. 2. Primer: An epoxy zinc-rich primer should be used, as it provides excellent rust prevention properties and good adhesion to the topcoat. 3. Intermediate coat: An epoxy limonite intermediate coat is used to enhance the overall corrosion resistance of the coating. 4. Topcoat: A polyurethane topcoat is applied; this topcoat boasts excellent weather resistance and chemical resistance, enabling it to effectively withstand the effects of the external environment. By following the proper coating procedures and using high-quality coatings, the service life of the tube bundle can exceed 4 years. .