What material is used for containers holding 85% phosphoric acid?
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Is 316L stainless steel suitable for tanks containing 85% phosphoric acid?
316L stainless steel is required, and the thickness of the cylinder must meet the specified standard.
What thickness should the cylinder have?
The corrosion of 316L stainless steel by thermal and wet phosphoric acid is related to the temperature and concentration of the phosphoric acid. At the same concentration, an increase in temperature **accelerates the corrosion of stainless steel, with the corrosion rate reaching its maximum at the boiling point ； When the temperature and concentration are the same, the corrosion rate of 316L is higher in the wet process, as wet phosphoric acid contains more impurities such as chloride ions.
For the materials, options such as steel-lined PTFE can be used! There is quite a lot of selectivity!
As long as the temperature remains below 200°, it is practical to use non-metallic materials, which are also much cheaper; for example, polytetrafluoroethylene, PP material, or silicon carbide linings work well
Hello! Should heat tracing be considered for 85% w phosphoric acid? What type of heat tracing should be used? Outer coil/inner coil? Steam tracing/Hot water tracing? Thank you!