Not in Wiki's description of U. S. "sandwich" quarters. You've got two different alloys in a bath committing electrochemistry on each other.Letsurf said:75% copper, 25% nickel
Nidum said:Citric acid - mild action .
Phosphoric acid based liquid soldering flux - medium action
Cold bath and soak in each case with agitation . Do not quench .
Several stronger solutions are available but probably not necessary .
Citric acid is usually quite adequate for removing oxides from a one time heat of clean metal .
Cupronickel is a type of alloy that is composed of copper and nickel. It is commonly used in pickling because of its resistance to corrosion and its ability to maintain its strength and durability in acidic environments.
The first step in preparing Cupronickel for pickling is to clean the surface with a degreasing agent to remove any oils or contaminants. Then, the surface should be lightly abraded to create a rough surface for the pickling solution to adhere to. Finally, the surface should be thoroughly rinsed with water before proceeding with the pickling process.
Cupronickel can be pickled using a variety of solutions, but the most commonly used is a mixture of nitric acid and hydrofluoric acid. It is important to follow the manufacturer's instructions and safety precautions when working with these acids.
The length of time that Cupronickel should remain in the pickling solution depends on the thickness of the material and the amount of surface oxidation. Generally, a few minutes to an hour is sufficient for pickling. It is important to monitor the process and remove the material when a uniform, clean surface is achieved.
When working with pickling solutions, it is important to wear protective gear such as gloves, goggles, and an apron to prevent contact with the acids. The pickling process should also be performed in a well-ventilated area to avoid inhaling any fumes. After pickling, the solution should be disposed of properly according to local regulations.