Selection of alloy materials resistant to corrosion by 30% concentrated hot hydrochloric acid
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Dear colleagues, I am conducting an experiment involving a reaction with concentrated hydrochloric acid. The reaction pressure is 0.8 MPa, the material used is a 30% concentration of hydrochloric acid, and the reaction temperature is 110 degrees Celsius. Currently, I am using an HC276 high-pressure reactor; after several batches of reactions, visible signs of corrosion were observed on the inner walls of the reactor. I would like to ask the experts here if there are any materials that could potentially resist this type of corrosion. I plan to conduct preliminary tests using such materials before proceeding with more in-depth experiments. Thank you all! :)
For corrosion by high-temperature hydrochloric acid at a concentration of 30%, the following alloy materials are generally chosen: 1. Ferritic stainless steels, such as 316L and 317L, which can provide good corrosion resistance under such conditions. 2. Nickel-based alloys: such as HC276, C22, etc. These alloys possess excellent corrosion resistance and can be used under high-temperature and highly corrosive conditions. 3. Titanium: Titanium exhibits excellent corrosion resistance in such environments, but considering the pressure requirements, appropriate titanium alloys such as TA2 and TA10 need to be selected. All these materials can resist corrosion by high-temperature hydrochloric acid at a concentration of 30%, but the specific choice still requires consideration of factors such as experimental conditions and economic costs. It is recommended to conduct coating tests to evaluate the corrosion resistance of the materials, and make a final decision based on the actual conditions. .
316L, C276, and titanium definitely won’t work. It is still better to consider using tantalum, tantalum-tungsten alloys, etc. To find out if HB3 works, it is necessary to consult the manual.
Impermeable graphite material is recommended.
110 degrees is not a high temperature; if heat release is not intense, fluorine lining or spraying can be considered； If the heat release is significant, it is recommended to use an enamel kettle.
Hastelloy reactors have been used, and in less than a month, significant corrosion appeared on the sealing surfaces and other areas
Enameled fluorine, or PTFE-lined
Your company is really wealthy – going straight for tantalum. Cost-performance ratio for enamel
I also think that since your company is wealthy, using polytetrafluoroethylene or enamel for this purpose would be fine; especially enamel, as it is relatively inexpensive