What coating system is used for corrosion protection on the unfinely surface-treated inner surface of the kiln tail dust collector?

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When the flue gas temperature is below the dew point, condensation water is formed. When the flue gas temperature reaches the dew point, water vapor condenses into water, which then reacts with substances such as SO3, SO2, and Cl2 to form acids that cause corrosion of metals； For ordinary carbon steel, corrosion occurs when the temperatures of water vapor and exhaust gases are below the dew point. Even when water vapor is above its dew point, as long as the temperature lies between 60–150°C, the presence of S02 intensifies the corrosive effect of water vapor. The corrosion rate increases as the difference between the exhaust gas temperature and the dew point decreases, and is proportional to the SO2 content. Carbon steel is prone to corrosion; it can be easily corroded. As long as a dust collector is made of ordinary carbon steel, it suffers from severe corrosion whether it is installed indoors or outdoors. The image below shows the inner surface of the dust collector at the end of the kiln; there is some rust on this surface. Sandblasting for rust removal is not feasible on site, so it is necessary to determine what treatment methods and anti-corrosion materials should be used to prevent corrosion.