Questions about 304 corrosion resistance
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Located by the sea, the equipment protective covers (for protection against rain and sunlight) are made of 304 material. Is anti-corrosion treatment necessary, and if so, how should it be carried out? Is there a problem using 304 for anti-corrosion paint?
Ensure proper passivation. The reason for choosing stainless steel is its visual appearance; if painting is to be done, it’s better to opt for carbon steel, as it is cheaper.
Under normal circumstances, 304 material does not require anti-corrosion treatment. But since you are located by the sea, the chlorine ion concentration in the air is high. Chloride ions are not corrosive in themselves, but they can increase the conductivity of water, leading to electrochemical corrosion on the surface of metal products. Additionally, chloride ions have a strong coordinating ability, which facilitates the occurrence of reactions. Therefore, during rainy weather, electrochemical corrosion occurs on the surface of 304 material protective covers. There are mainly three methods for preventing corrosion in 304 material: one is applying anti-corrosion paint, as you mentioned; the second is pickling and passivation treatment; the third is electrochemical treatment.
Carbon steel with anti-corrosion treatment was originally used on site, but the thickness of the carbon steel plates was too low, resulting in severe corrosion.
If anti-corrosion paint is applied, is it the same as the method used for carbon steel?
Yes, there are no special requirements for this.
Chat on QQ at 3293843250 to learn about acid washing and passivation techniques in Europe; a 1200-hour salt spray test poses no problem
When I was at the beach, I noticed that carbon steel deteriorates quite badly, while stainless steel doesn’t have many problems; however, it’s still best to apply paint to it.