How to prevent corrosion of 30,000 ppm chloride ion frame
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I made a device that needs to be immersed in water with 20,000 to 30,000 ppm chloride ions. The theme material of the equipment is 304. I would like to ask what process is required for anti-corrosion on the surface. Or what material should be used to ensure that it is not corroded. The cost cannot be too high
Our company's nanocomposite emulsion series has good anti-corrosive media permeability. Welcome to consult.
304 stainless steel, which needs to be immersed in water with 20,000 to 30,000 ppm chloride ions, has its own design problems. We know that austenitic stainless steel will have a tendency of serious pitting corrosion in such a high concentration of chloride ions, especially when the pH value is less than 7, severe pitting corrosion will occur. It is recommended to use carbon steel base material and anti-corrosion on the surface.
I'm looking for a material that doesn't require preservative treatment. High pressure pipeline.
If you are looking for chlorine-resistant metal materials among metal materials, you can choose between duplex steel and titanium according to the specific use medium and operating conditions.
Duplex steel is not very resistant to chloride ions. Can you provide a model of duplex steel?
May I ask about the temperature? If you just want to be cheap and easy to use, it might be good to use carbon steel lined pipelines. But generally speaking, it is recommended to use FRP pipelines (at least this is what we use). But FRP has grades... When selecting, it is important to pay attention to whether the pipeline will rub and shake after being configured. Finally, on the surface of FRP, pay attention to whether there is exposed glass fiber.
Consider 2205 duplex steel.
If metal is used because of high-pressure pipelines, someone said to use duplex stainless steel. After checking the information, there is such a suggestion, but it is recommended that the chromium content should be greater than 25%. Let me help you check the chromium content of some duplex steels: 2205-22% 3RE60-18.5% 2304-22.5% 2507-25% 2906-29% 2707-27% 3207-32% --------------- The coding of duplex stainless steel is called 2205 by the chromium-nickel content---22% chromium, 5% nickel and so on.
The use of special conforming materials can prevent corrosion and is currently used in the chlor-alkali industry.
Duplex steel SAF2507 should be cost-effective. Can 304 externally sprayed plastic be considered to be low-cost? Some coatings cannot bear it. Ordinary paint is not impossible to prevent corrosion. The thickness should be 1mm, plus sacrificial anode protection (zinc anodes are recommended for temperatures below 40 degrees Celsius). Aluminum anodes can also be used. (for reference only)