AURUNA® 311 For Technical Applications Gold Cobalt Electrolyte

AURUNA® 311 For Technical Applications Gold Cobalt Electrolyte

For the adhesive direct gold-plating of stainless steel and nickel

AURUNA® 311 For Technical Applications is a strongly acidic alloy electrolyte for the adhesive direct gold-plating of stainless steel. It is preferably used for chromium-nickel steels, molybdenum steels and nickelbased alloys difficult to activate. Due to its strong activation effect, the electrolyte can be often used successfully as well for other passive materials difficult to plate.

The gold electrolyte is suitable for both strike gold layers and thick coatings in the technical field. The coatings are ductile, low in pores and protect against corrosion.

AURUNA® 311 For Technical Applications can be used for rack and barrel operation as well as in reel-to-reel plating (e.g. spray and dip cells and brush).

Electrolyte characteristics

Electrolyte type

Strongly acidic

Metal content

2 (1 - 10) g/l Au

pH value

0.6 (0.1 - 0.8)

Operating temperature

25 (20 - 40) °C

Current density range

2 - 6 A/dm²

Plating speed

0.08 μm/min at 2 g/l Au, 2 A/dm²

Anode material

Pt-Ti, MMO (type PLATINODE® 177 )

Coating characteristics

Coating

Gold-cobalt

Alloy composition

Approx. 99.7 weight % Au 0.3 weight % Co

Colour of deposit

Deep yellow

Brightness

Bright

Hardness

160 HV

Max. coating thickness

10 μm

Advantages

  • Strongly acidic gold alloy electrolyte for the direct gold-plating of stainless steel and nickel
  • Very good activation effect – without halogenides
  • Low-pore, ductile and crack-free coatings
  • Suitable for strike gold layers as well as for thick coatings
  • Good throwing power
  • The coatings are RoHS compliant
  • Also available as a cobalt-free special version
  • Suitable for rack, barrel and reel-to-reel plating

Applications

  • Electrical contacts
  • Stainless steel contacts
  • Stainless steel springs

Downloads

  • Produktblatt-auruna-311-for-technical-applications-en-screen-20190416.pdf
    Download

Your contact person

Markus Legeler

Manager Sales International
T: +49 7171 607 204
F: +49 7171 607 316
Email

Find a representative in your region

×

      Umicore uses certain monitoring and tracking technologies such as cookies. These technologies are used in order to maintain, provide and improve our services on an ongoing basis, and in order to provide our web visitors with a better experience.

      By clicking on the "Accept all" button you agree to the use of these cookies while using the website. For further information regarding how we use cookies and other tracking technologies, please see section 10 of our website privacy notice

          Necessary cookies are essential and help you navigate our website. This helps to support security and basic functionality and are necessary for the proper operation of our website, so if you block these cookies we cannot guarantee your use or the security during your visit.

          Cookies that help us to understand the behaviour of users of our website. This allows us to continuously improve our website to provide the best information in support of our project aims. These cookies also help us understand the effectiveness of our website. For instance these cookies tell us which pages visitors go to most often and if they get error messages from web pages.

          Cookies that deliver content to you based on your interests, which are assumed from your browsing history. Most Targeting Cookies track users via their IP address and, thus, may collect some Personal Data. Personal Data collected by Targeting Cookies may be shared with third parties, such as advertisers.