Selection of metal materials in a human-like gastric environment
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Here’s the situation: I’m currently designing a device that requires the use of a sampling needle to transport liquid. The liquid in question contains chloride ions. The sampling needles available on the market are made of 304 or 316L stainless steel, and after researching online, I learned that these materials can suffer from intergranular corrosion. However, I don’t have the facilities to manufacture my own sampling needles, so I’m seeking advice from those with more experience – do you have any good solutions? The specific conditions are as follows: Liquid description: A dilute salt solution at a concentration of 1 mol/mL; it has been diluted with water to a pH of 1.5, with 1 g of pepsin added per 100 mL. Temperature: 37 degrees Celsius, plus or minus 0.5 degrees. Will using 304 or 316L stainless steel needles to transport this liquid cause any problems under such conditions? If it has a significant impact, is there any way to deal with it? I just registered, so I don’t have any points to offer as rewards. Normally, I can help everyone download domestic papers without any conditions. Thank you in advance!
No. . . But, is this simulated stomach environment meant for surgery? Can non-metallic materials be used?
Is it a high-precision instrument? If it is high enough in quality, Hastelloy C can be chosen.
Is Hastelloy B more resistant to salt and acid corrosion than Hastelloy C?
This instrument is mainly used for routine experiments. I considered using non-metal materials such as PTFE, but that would require a syringe nearly 200 mm long with a relatively small inner diameter, and it seems impossible to manufacture one like that
In other words, under this concentration and environment, the corrosion rate of this material won’t be too fast, right? Can it be received?
I mean, I won’t. . . ;P
For chlorine, titanium tubes are recommended; I have some experience with chlor-alkali processes, so I know a bit about this. Alternatively, 316L steel can be used, which contains titanium or niobium elements.
This is hydrochloric acid; titanium won’t work. There is a minimum pH requirement for the use of titanium in chloride environments; generally, the pH must be above 3
So what material is better? It’s best to be one that is easy to work with