Platinised Titanium Anodes

Platinised Titanium Anodes

Application:

Platinised titanium anodes are ideal for various electrolytic processes, and their applications are extensive:

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• Electroplating of precious metals, such as Au, Pt, Pd, Rh, and Ru.
• Electroplating of non-ferrous metals, including Ni, Cu, Sn, Zn, and non-fluoride
  Cr baths.

Specification:

Platinised titanium anodes are composed of a titanium substrate, which can take the form of expanded metal, sheet, rod, wire, or tube, featuring a thin coating of platinum that ranges between 2 to 5 microns in thickness. These anodes exhibit the electrochemical properties of platinum. The titanium utilized is 99.5% pure, in accordance with ASTM (American Society of Metals) standards.

The platinum coatings, ranging from 2 to 5 microns, are not entirely impervious to various electrolytic processes. This is particularly true for expanded metals, where the acute angles of the diamond mesh result in minimal coverage.

Schloetter recommends a coating thickness of 2.5 microns, as it offers longevity while reducing the chances of porosity and pinholes. Coatings of 1 to 1.5 microns should be avoided due to potential pinhole issues. Although coatings of 7 to 10 microns exist, they are significantly more expensive but provide a longer lifespan.

Platinised titanium anodes function efficiently only in electrolytes that do not compromise the titanium base. This makes their use unsuitable in highly acidic or basic environments, as well as in Chromium baths that contain fluorides.

The operational lifespan of the platinised titanium anodes is influenced by the chemical resistivity of the base metal, the rate at which the deposited platinum dissolves in the electrolyte—determined by the layer morphology and adhesive properties, pH, current density, and current ripple.

Generally, the dissolution rate is low in most applications, and the benefits of using platinised titanium anodes significantly outweigh any minimal metal loss. In fluoride-free chromium baths, platinum consumption is estimated to be around 1 to 4 g of platinum for every million ampere-hours. Unfortunately, accurate values for other baths are not readily available.

Advantages:

• Extended operational life; requires no maintenance.
• Cost-effective due to minimal platinum needs.
• High dimensional stability and excellent load-carrying capacity.
• Consistent current distribution.
• Superior corrosion resistance.
• Lightweight design.

Product No.

Description

Platinode 187LOC

Platinode 187SO

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Note: Specifications may change without prior notice.

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