Argentium 960-Pure Gebruikershandleiding - Pagina 11

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Finishing processes
Surface passivation - heat treatment
Argentium silver's tarnish resistance relies upon a protective germanium oxide surface layer. It is
possible to assist the formation of this layer by applying a simple heat treatment to finished pieces.
After pieces have received their final polishing and degreasing/cleaning operations, heat them in an oven
in an air atmosphere at 100°C/212°F for 3-16 hours. No further polishing should be required provided
that the oven is clean. If the pieces require any additional cleaning after this process, follow the cleaning
instructions
given on page 9.
Important information
•
Ensure that the Argentium silver finished items are thoroughly clean before heat treating.
Preheat the oven to the required temperature before carrying out the heat treatment.
•
Make sure that the oven is clean and free from chemicals and substances that may be detrimental
•
to the heat treatment process.
Surface passivation - chemical treatment
As an alternative to the heat passivation process it is possible to chemically treat Argentium silver, which
allows the protective germanium oxide layer to develop naturally over a period of time underneath the
protective layer.
This treatment is particularly recommended instead of the heat passivation process where:
•
The manufacturing process does not allow the standard heat passivation process to be carried out.
•
The local atmosphere is known or suspected to contain significant amounts of sulphurous
compounds (e.g. areas where there are higher levels of pollution).
Treat the pieces with Legor Tenaris Pro in accordance with the manufacturer's instructions. This
chemical passivation will protect the pieces from discoloration until a protective germanium oxide layer
has naturally developed.
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