Argentium 960-Pure Manuale d'uso - Pagina 3

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Heating, quenching and pickling

Heating applications and heat/colour recognition

Argentium silver displays a paler colour glow than traditional sterling silver at red-hot temperatures.
Torch and furnace annealing do's
•
Carry out torch annealing and soldering procedures in a shaded area to prevent overheating.
•
Make sure your Argentium silver is securely supported whilst heating.
•
Wait until the red glow has disappeared from your Argentium silver before touching or moving.
•
Recommended furnace annealing temperature: 600-650°C/1112-1202°F for 20-45 minutes
(dependent on the thickness of the material being annealed).
•
When furnace annealing using a protective atmosphere, it is important that the furnace gas does not
deplete the germanium oxide surface layer as this will diminish tarnish and firestain resistance. Use
inert furnace atmospheres (i.e. nitrogen or argon) or an atmosphere containing maximum 5-10%
hydrogen in nitrogen.
Don'ts
•
Do not touch, move or manipulate Argentium silver while it is at red heat, as this may cause
cracking.
•
Be careful not to overheat.
•
Furnace atmospheres containing more than 10% hydrogen are not recommended.

Quenching

Argentium silver retains its heat for longer than traditional sterling.
Do's
•
After annealing, wait for the red glow to disappear before quenching (best judged in a shaded area).
•
Always quench in water.
Don'ts
•
Do not quench Argentium silver too quickly as cracking may occur.
•
It is hazardous to quench metals in pickle solutions.

Pickling

Recommended pickling solutions:
•
Sodium Bisulphate
•
Weak Sparex
•
Phosphoric Acid
•
Sulphuric Acid
Do's
•
Dilute pickle solution as advised by the supplier.
•
Heat pickle solution to recommended working temperature.
•
Use pickling solution that is not over-used.
Don'ts
•
Do not use Hydrofluoric Acid with Argentium silver
germanium oxide and diminishes tarnish resistance.
•
Do not use old or over-used pickle as the strength of any pickling solution will reduce with use and
saturated solutions can leave unwanted deposits on immersed items.
- Hydrofluoric Acid dissolves the protective
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