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during the application to contact parts. After evaporation of the alcohol
a thin and uniform layer of lubricant is retained on the contact surfaces.
*'''Properties of the Synthetic DODUCONTA Contact Lubricants'''
<table border="1" cellspacing="0" style="border-collapse:collapse"><tr><td><p class="s8">Lubricant</p></td><td><p class="s8">DODUCONTA</p></td></tr><tr><td><p class="s8">Lubricant</p></td><td><p class="s8">B5</p></td><td><p class="s8">B9</p></td><td><p class="s8">B10</p></td><td><p class="s8">B12K</p></td><td><p class="s8">B25</p></td></tr><tr><td><p class="s8">Contact force</p></td><td><p class="s8">>1N</p></td><td><p class="s8">0.1 - 2N</p></td><td><p class="s8">< 0.2N</p></td><td><p class="s8">0.2 - 5N</p></td><td><p class="s8"><1N</p></td></tr><tr><td><p class="s8">Density (20°C)</p><p class="s8">[g/cm³]</p></td><td><p class="s8">1.9</p></td><td><p class="s8">1.0</p></td><td><p class="s8">0.92</p></td><td><p class="s8">1.0</p></td><td><p class="s8">1.0</p></td></tr><tr><td><p class="s8">Specificel. Resis-</p><p class="s8">tance [<span class="s9">S · </span>cm]</p></td><td/><td><p class="s8">2 x 10<span class="s18">10</span></p></td><td><p class="s8">10<span class="s18">10</span></p></td><td><p class="s8">6 x 10<span class="s18">9</span></p></td><td><p class="s8">5 x 10<span class="s18">8</span></p></td></tr><tr><td><p class="s8">Viscosity (20°C)</p><p class="s8">[mPa·s]</p></td><td><p class="s8">325</p></td><td><p class="s8">47</p></td><td><p class="s8">21</p></td><td><p class="s8">235</p></td><td><p class="s8">405</p></td></tr><tr><td><p class="s8">Congeal temp.[°C]</p></td><td/><td><p class="s8">-55</p></td><td><p class="s8">-60</p></td><td><p class="s8">-40</p></td><td><p class="s8">-35</p></td></tr><tr><td><p class="s8">Flash point[°C]</p></td><td/><td><p class="s8">247</p></td><td><p class="s8">220</p></td><td><p class="s8">238</p></td><td><p class="s8">230</p></td></tr><tr><td/><td><p class="s8">220</p></td><td/><td/></tr></table>
*'''Applications of the Synthetic DODUCONTA Contact Lubricants'''
===7.6 Passivation of Silver Surfaces===
The formation of silver sulfide during the shelf life of components with silver
surface in sulfur containing environments can be significantly eliminated by
coating them with an additional protective film layer (Passivation layer). For
electrical contact use such thin layers should be chemically inert and
sufficiently conductive, or be easily broken by the applied contact force.
The passivation process SILVERBRITE W ATPS is a water-based tarnish
preventer for silver. It is free of chromium(VI) compounds and solvents. The
passivating layer is applied by immersion which creates a transparent organic
protective film which barely changes the appearance and only slightly
increases the good electrical properties such as for example the contact
resistance. The good solderability and bond properties of silver are not
negatively affected. Because of its chemical composition this protective layer
has some lubricating properties which reduce the insertion and withdrawal
forces of connectors noticeably.
Fig. 7.7: Typical process flow for the SILVERBRITE W ATPS process
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Kontaktschichten. VDE-Fachbericht 40 (1989) 33-39
Ganz, J.: PVD-Verfahren als Ergänzung der Galvanik. Metalloberfläche 45 (1991)