Selection of the best metal materials for corrosion resistance in hydrochloric acid at different concentrations and temperatures
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A friend who works with equipment raised this question; he deals with testing and experimental equipment, and comes across different media as well as various operating conditions. Based on my understanding of the materials, 276 would be more appropriate. Please ask an expert to help answer, preferably with a test curve.
PP or PVDF will do, right? Why must metal be used? Is there a requirement for strength?
Yes, it involves research and experimental data in areas such as chemistry, metal materials, and material physics; one realizes too late that such knowledge is lacking when it’s needed.
Then use 254; if that doesn’t work, use TA1
Hastelloy 276, right? It is indeed suitable; titanium is less resistant to hydrochloric acid corrosion compared to Hastelloy
Concentrated hydrochloric acid – 276 doesn’t work either. After asking around, there’s also the issue of zirconium materials
Even TC4 can’t withstand it, let alone TA1, which is so soft
Like titanium, zirconium’s excellent corrosion resistance depends on the integrity of its surface oxide film. Zirconium’s corrosion resistance in oxidizing media is inferior to that of titanium, but it is much better than titanium in reducing media. Zirconium exhibits good corrosion resistance in high-temperature, high-concentration hydrochloric acid. Zirconium exhibits better corrosion resistance in hydrochloric acid than other metals, but pitting occurs in the presence of oxidizing agents; for example, in hydrochloric acid containing FeCl3, zirconium suffers from pitting, and this tendency to pitting increases as the concentration of Fe3+ rises.
Has my buddy done any experiments? Could you share any experimental data or curves?