What material should be used for valves in strongly oxidizing acidic salt solutions?
Thread Content
Question: For a solution that flows through sodium dichromate and sulfuric acid, what type of valve should be used?
The solution flowing through sodium dichromate and sulfuric acid is a strongly oxidizing acidic solution; depending on factors such as concentration, temperature, and operating conditions, an appropriate material must be selected to ensure the valve’s service life and stability. Common valve materials include stainless steel, ceramics, polytetrafluoroethylene, etc. For solutions flowing through sodium dichromate and sulfuric acid, it is recommended to use valves made of 316L stainless steel or Hastelloy to ensure they can withstand the strong oxidizing and acidic properties of the solution. At the same time, during installation and use, attention must also be paid to the valve’s sealing performance and maintenance to ensure its long-term stable operation. .
At room temperature, the material is fed slowly through the valves and pipes at a low flow rate. It is known that after the reaction, hexavalent chromium is reduced to trivalent chromium. The solution consists of trivalent chromium and sulfuric acid, with a small amount of hexavalent chromium; it still has slight corrosive effects on 316L.
Whether it is at room temperature or high temperature, and what the specific temperature is, depends on the actual operating conditions; PVDF/PFA can be used for this
I recommend a highly corrosion-resistant ceramic coating for you.