Dissolution of Inconel 617/Haynes 230

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In summary, the speaker is attempting to dissolve nickel-based alloys Inconel 617 and Haynes 230 using the Berzelius solution, but it did not have much effect. They are seeking alternative methods and suggest using Perry's Chemical Engineering Handbook to find corrosivity charts for these alloys. They also mention the possibility of using a reductive method, but it may not be suitable for recovering the elements of the alloy.
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rams210405
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I am trying to dissolve the nickel-based alloys Inconel 617 and Haynes 230 in order to analyze the precipitates with XRD. I already tried the Berzelius solution which is 47.7 g of copper (II) chloride, 41.7 g of potassium chloride, 2.9 g of tartaric acid, 275 ml of distilled water, and 22.4 ml of hydrochloric acid. While this worked for several steels it had almost no effect on the nickel alloys. If you have any ideas on what might work please help!
 
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If you have access to Perry's Chemical Engineering Handbook, you can find some of these exotic alloys and their corrosivity charts to many chemicals under a number of conditions. The inconels and Haynes alloys are made for Halogen acid resistance and are also resistant to oxidative conditions. The solution you are using is made to apply oxidative Cl- attack and keep the metal ions in chelated solution.

A reductive (hot CO) can remove Ni as the poisonous Nickel Carbonyl gas and leave the alloy largely destroyed or embrittled. If the goal is recovery of the elements of the alloy this won't work, but there may be some combo that will achieve a similar chemical route to corroding the metal in a quantitative manner.
 

What is the composition of Inconel 617/Haynes 230?

Inconel 617 is a nickel-chromium-cobalt-molybdenum alloy, while Haynes 230 is a nickel-chromium-tungsten-molybdenum alloy. Both alloys also contain small amounts of iron, manganese, and silicon.

What is the melting point of Inconel 617/Haynes 230?

The melting point of Inconel 617 is approximately 1350°C (2460°F), while the melting point of Haynes 230 is approximately 1375°C (2500°F).

What are the applications of Inconel 617/Haynes 230?

Inconel 617 and Haynes 230 are commonly used in high-temperature environments, such as gas turbines, aerospace engines, and heat treatment equipment. They are also used in chemical and petrochemical processing, as well as in the nuclear industry.

How does Inconel 617/Haynes 230 resist corrosion?

Both alloys have excellent resistance to oxidation and high-temperature corrosion, making them suitable for use in extreme environments. They also have good resistance to aqueous corrosion and can withstand a wide range of acids and alkalis.

What is the process of dissolving Inconel 617/Haynes 230?

Inconel 617/Haynes 230 can be dissolved using a variety of methods, including acid pickling, which involves immersing the alloy in a solution of nitric and hydrofluoric acid. Another method is electrochemical dissolution, which uses an electric current to dissolve the alloy. Additionally, these alloys can also be dissolved using molten salts or alkali solutions at high temperatures.

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