Does anyone know or may anyone help me to find which of these materials (SS304, Monel 400 and Hastelloy) is the most resistant to a low concentrated HF solution (ca. 2% wt.) under high temperature (350 C) and pressure (autoclave)? I need to find a reactor to withstand these conditions.
Hydrogen fluoride is extremely corrosive and its toxic nature makes it imperative that it be safely contained. The corrosion of steels in hydrofluoric acid solutions increases with the dilution of the HF solution. Moreover, it can be worse by erosion.
Fluoride ions could promote stress corrosion cracking even at low temperatures. If austenitic stainless steels are used, it is recommended to use only a grade with low carbon content (C < 0.03 %) or Ti or Nb stabilized.SS304 is not better, Monel 400 and Hastelloy is better for HF
Alloy 400 is one of the most resistant alloy for use with aqueous HF o For all concentrations Resistant at room temperature Corrosion rate will not exceed 0.5 mm/year up to atmospheric boiling. point in air free solutions . Special care with regard to oxygen, CuF2 and generally all types of oxidants contents corrosion mainly in the vapour phase. stress corrosion cracking, especially if cold formed or if welds are not stressà relieved.
Research MATERIAL SELECTION FOR NITROGEN BASED FERTILIZERS PLANTS
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