Do insulated pipes need to be coated with anti-corrosion paint?
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Some corrosion protection specialists now believe that if high-temperature pipes are insulated, there is no need to apply corrosion-resistant coatings; they also claim that at higher temperatures, such coatings do not last long. What I want to ask is whether anti-corrosion measures are necessary in this situation, and what are the consequences if they are not taken? Thank you all for helping me figure it out!
It’s definitely necessary to use preservatives. This is because most insulation materials are made from minerals that have been calcined and bonded together. Since minerals contain large amounts of inorganic salts, the insulation materials produced from them still contain harmful corrosive substances such as chlorides, fluorides, and sulfides ； On the other hand, insulation materials have a porous structure with a large surface area and numerous capillaries, which gives them strong adsorption and water absorption capabilities. Corrosive impurities, in combination with water, form strong electrolyte solutions that possess high corrosivity.
Many companies have high-temperature anti-corrosion coatings. As for the issue of the coating coming off due to high temperatures, that is caused by an inappropriate choice of coating material, or incomplete rust removal, etc. I checked for you: Shanghai Jieling Special Coatings – Heat-resistant aluminum powder paint with a temperature resistance of 500°C. This heat-resistant aluminum powder paint is based on modified silicone resin and is suitable for use in new constructions as well as for maintenance purposes; it protects steel materials at temperatures up to 500°C. It can be applied directly onto zinc silicate primers, or onto steel surfaces that have been sandblasted or treated manually. 500℃ heat-resistant anti-rust primer: A two-component silicone heat-resistant anti-rust primer with a temperature resistance of up to 500℃, suitable as an anti-rust primer for high-temperature pipes, engines, boiler equipment, etc. 500℃ heat-resistant zinc powder primer, silicone zinc powder primer, with excellent heat resistance and cathodic protection properties. 400°C heat-resistant topcoat: a two-component silicone heat-resistant topcoat used for the protective coating and decoration of the surfaces of various mechanical devices exposed to temperatures up to 400°C. Such as boilers, pipes, etc. High-temperature resistant aluminum powder paint at 400°C: a one-component modified silicone aluminum powder heat-resistant paint, used for coating the surfaces of steel equipment exposed to temperatures up to 400°C. 400°C heat-resistant anti-rust primer: A silicone resin primer capable of withstanding 400°C, suitable as a primer for various high-temperature equipment such as high-temperature pipes, engines, and boiler systems. 400℃ inorganic zinc powder heat-resistant primer, inorganic zinc silicate heat-resistant paint. 300°C heat-resistant topcoat: a one-component modified silicone heat-resistant paint, used for the protective and decorative coating of various mechanical equipment exposed to temperatures up to 300°C. Such as boilers, pipes, etc. 300℃ aluminum powder heat-resistant paint: an oil-based aluminum powder paint used on steel surfaces where the surface temperature can reach 300℃. Heat-resistant anti-rust primer capable of withstanding 300°C; it is a modified silicone resin primer suitable for use as a primer on various high-temperature equipment such as high-temperature pipes, engines, and boiler systems. A moisture and heat-resistant primer suitable for 300°C; it can dry at room temperature or by drying in an oven. The paint film possesses good physical and mechanical properties, as well as resistance to moisture, heat, and temperature changes. Used as a primer for the surface of metal parts at high temperatures of 300°C. A heat and moisture-resistant topcoat suitable for 300°C; it can dry at room temperature or by drying in an oven. The paint film possesses good physical and mechanical properties, as well as resistance to heat and moisture and temperature changes. Used for coating the surfaces of metal parts at temperatures up to 300°C. 200°C heat-resistant topcoat for the protective and decorative coating of various mechanical equipment exposed to temperatures up to 200°C. The 200℃ aluminum powder heat-resistant paint is used on steel surfaces in the metallurgical and mechanical industries as well as in insulation projects, to provide heat resistance, rust prevention, and decorative effects; it can withstand temperatures up to 200℃ and possesses all the characteristics of ordinary anti-corrosion paints. 200°C heat-resistant anti-rust primer, single-component or two-component, used as a 200°C heat-resistant anti-rust primer.