Achtzehnmorgenweg 3
D-61250 Usingen
Fon: +49 - 6081 - 10 60 - 0
Fax: +49 - 6081 - 10 60 - 60
eMail: info@metakem.de
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Gold-VA-bath
Applications and attributes
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gilds stainless steel without an intermediate layer
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used for gold striking
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pre-striking of dental braces / brackets before final plating
| One liter bath | |
| Gold-VA Concentrate | 100 ml |
| Deionised water | 900 ml |
| Au-VA-replenisher (= 2 g Au) | 3,5 g |
Adjust the pH with electrometric equipment or special, low pH paper in the range 0.2 to 0.6. The coating adhesion decreases if the pH is too high.
Replenishing
Add 1.75 g Au-VA-replenisher per gram Au removed from the bath.
| Optimum | Range | |
| Au content | 2 g / l | 1 - 4 g / l |
| pH | 0.3 | 0.15 - 0.6 |
| Agitation | > 5 m / min (solution/mechanically) | |
| Anodes | PtNb (platinised
niobium) MOXTi (mixed oxide coated titanium) |
|
| Current density | 4 A / dm² | 1 - 10 A / dm² |
| Time | 6 min | |
| Cathode efficiency | 4.5 mg Au / A x min | |
| Deposit | ||
| Gold: | AuCo-0,2% | |
| Deposit density: | 17.5 g /cm³ | |
| Hardness: | approx. 160 VPN | |
Please discuss your application with us.
