# What kind of metal alloys can resist corrosion from molten salt?

Molten salt is pretty hot, 801 C. With such heat and the corrosive nature of salt, I am wondering what type of metal alloy or other material hybrid would be appropriate to handle and work with molten salt?

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## 2 Answers

George Lai's High-Temperature Corrosion and Materials Applications (excerpts available on Google Books) is a good source. Very often for molten salts, Hastelloys are used; they're special-purpose alloys developed by Haynes International. I can't find a reference, but I believe Oak Ridge National Laboratories used Hastelloys for their molten salt reactors (which had fluoride salts, very reactive).

If you're working with sodium chloride (little potassium), according to Lai, Hastelloy-188 seems to be the best bet, although many others would work as well. One reality of chemical engineering is that there will always be corrosion, it's just a matter of keeping it at an acceptable rate for the application.

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Oh wow, they did a heat exchange and everything, which is very relevant to my interests. :) –  Andrew Hoffman Jun 30 '14 at 22:37

I think you should use tungsten as it has the highest and best melting point among all the stable metallic elements its melting point is nearly $3700~\mathrm{K}$

More over its price is also considerably lower than other metals with higher melting points and if you think of corrosive nature, then I would recommend you to use silver but it becomes very costly.

Feel free to comment for further clarification. I will definitely help you.

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