Argentium 960-Pure Gebruikershandleiding - Pagina 9

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Finishing processes

Optimising tarnish resistance

Optimum tarnish resistance of Argentium silver relies upon applying good practice for finishing
procedures. The aim of these finishing procedures is to optimise the formation of the protective
germanium oxide that gives Argentium silver its tarnish resistance.
Certain practices used in the trade with traditional sterling silver may harm Argentium's protective
germanium oxide and care must be taken not to contaminate the surface of Argentium silver with other
metals/materials during polishing processes.
The following recommendations are a guide to achieving a beautiful lustrous finish with optimum tarnish
resistance.

Degreasing and rinsing

Argentium pieces should be ultrasonically cleaned, rinsed with tap water and thoroughly dried:
a) Between each polishing stage.
b) Before the final surface passivation heat treatment.
Ultrasonic cleaning process
For commercial operations it is recommended that the following cleaning process is used:
1) Degrease: Immerse pieces in an ultrasonic bath at 50°C (122°F) for 2 minutes using a 2% solution of
the 'Argentium approved' cleaner supplied by Legor Group (product code 4580511).
2) Rinse: Rinse with demineralised water at room temperature for 15 seconds.
3) Surface neutralisation: immerse in Legor 'Argentium approved' pickling solution (product code
4581516) for 10-15 seconds.
4) Rinse with demineralised water at room temperature for 15 seconds.
For smaller operations, again use an ultrasonic cleaner:
•
Cleaning solution: dishwashing detergents including Joy and Fairy can be used (ensure the pH of
the cleaning solution is between 7-9)
•
Cleaning solution temperature: 40-60°C / 104-140°F
•
Cleaning time: immerse pieces for 2-3 minutes
•
Rinsing: rinse with tap water and dry thoroughly
Important information
Do not rinse Argentium silver alloys with deionised/reverse osmosis water - the high purity of this water
can remove some of the protective germanium from the surface of Argentium, therefore reducing tarnish
resistance.
Steam cleaning and electrolytic cleaning should not be used with Argentium silver as these processes
can diminish tarnish resistance.
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