New Umicore Antitarnish for Reel-to-Reel,
Nickel-phos Electrolytes, Tin Whiskers Solution

Sealing 691 is an organic antitarnish process based on nanotechnology: special nanopolymers absorb on the metal surface and crosslink to form a protective layer a few nanometers thick. Sealing 691 provides invisible protection from tarnish and wear, while preserving precious metal brightness.

Sealing 691’s aqueous formula is chrome-free and RoHS compliant. It will not compromise solderability or bonding capacity, has low contact resistance, and preserves metal's inherent lubricity, making it suitable for plug connectors and electrical contacts. It is compatible with rack and barrel equipment, and, due to its short dwell time (as little as 4 seconds, compared with competitive products at 30 seconds) it is particularly well suited to reel-to-reel processing.

Sealing 691 preserves metal brightness indefinitely, while allowing substantial reductions in precious metal use. As a result, it’s also ideal for decorative applications on jewelry, leather goods and hardware.

For more details, or to arrange test processing, contact your Uyemura representative.

Sealing 691 was developed by Umicore Galvanotechnik as an improved version of its popular Antitarnish 616 PLUS. It is available throughout North America exclusively from Uyemura.

Tin Whiskers Solution

An important new technology from Uyemura prevents whiskers formation in electroplated tin for 22,000 hours – and longer.

GRX-70 is a unique, high-speed electrolytic plating process – a breakthrough in the control of tin whiskers. Whisker crystals of tin and tin-based alloys are the most common culprits in the short circuiting of electronic components. Most often, the cause of tin whiskers is compressive stress. The proprietary technology developed by Uyemura dissipates compressive stress, preventing whisker formation. GRX-70 is ideally suited for connectors and semiconductor lead frames.

Features include:

  • High purity anode
  • High deposition speeds for rackless and reel-to-reel processing
  • High deposition efficiency over a wide current density range
  • Bath is lead and fluoride free, and foam-resistant.
  • Operating range is 113-131°F, with 122° the optimum.
  • Film has a uniform white matt appearance; appearance after reflow is excellent. Carbon and sulfur concentrations in the film are very low.
  • Excellent solderability.

Read: The Elimination of Whiskers from Electroplated Tin.
by Masanobu Tsujimoto, Don Gudeczauskas, and George Milad

NEW Nickel-Phos Electrolytes Debut

Two important new Niphos electrolytes both generate huge energy savings as EN replacements, and exhibit less internal stress compared with existing Niphos electrolytes. The superior hardness, abrasion and corrosion properties inherent in Niphos products are identical.

NIPHOS® 967 plates via rack or barrel, was engineered for connectors. Used in combination with hard gold, it allows substantial reductions in gold thickness.

NIPHOS® 968 for barrel plating was developed to plate steel rods in hydraulics and shock absorbers: nickel-phosphorus layers are combined with chromium as a final layer. This combination allows lower thicknesses of the chromium and dramatically improves wear properties of the complete system.

New from Uyemura: Mixed Metal Oxide Anodes / MMO Anode

Metal oxide anodes are manufactured from precious iridium and ruthenium oxides, sometimes combined with non-precious tantalum and titanium oxides. Solutions of these metals are applied in layers in a multi-stage process; they are subsequently transformed in a thermal process into their catalytically effective shape.

For details see our MMO Anode page.