GLENAIR
The corrosion process described above will continue without rest, until one or more of the four conditions is no longer met. For this reason, the elimination of one of the four conditions is the very heart and soul of corrosion prevention efforts. An unbroken (perfect) protective coating on the surface of a metal part will, for example, prevent the electrolyte from connecting the cathode and anode and so eliminate the ionic current flow. Sacrificial anodes, to cite another example, can halt corrosion by integrating an alternative metal material into the metallic path (usually zinc) to halt corrosion of the more valuable, protected substrate. Perhaps the ultimate solution to corrosion is to replace the metallic materials with engineering plastics, essentially
eliminating the anode from the equation altogether. Dissimilar metals are the most frequent cause of unexpected corrosion failures in marine environments, which is why Glenair’s composite components are of such value in systems subject to salt spray, stack gas and other corrosive electrolytes. Tin-Zinc: a High-Performance Alternative
Glenair Tin-Zinc plated MIL-DTL-28840 qualified connectors. This new cadmium-free, RoHS finish is compatible with legacy finishes, and offers high conductivity and shielding performance, and robust corrosion resistance.
Tin-Zinc is a RoHS cadmium-free sacrificial finish that offers high conductivity and shielding performance, corrosion resistance, solderability, and proven compatibility with legacy cadmium and zinc-nickel finishes. The plating system, which is a chromate-conversion-coated tin-zinc alloy over an underplating of electroless nickel, performs well in SO 2 / salt spray qualification testing and has the following features and benefits: Tin-Zinc, the new DLA-qualified replacement for Cadmium • Now qualified as cadmium-free and compatible tin-zinc (TZ) plating for M28840 class code L and M (class T and TJ) navy land and maritime applications. • High conductivity and shielding performance in harsh maritime conditions • High corrosion resistance • Compatibility with legacy cadmium-plated connectors and environmental shrink boots • RoHS-compliant material
HIGH CONDUCTIVITY AND SHIELDING PERFORMANCE:
VG95234 Code J Tin-Zinc plating shield connection average value: 0.5 mohm (VG95234 with legacy Cadmium plating shield connection average value: 1.5 mohm) Durability (500 mating cycles) + dry heat (16 hours at 125°C) + cold (16 hours at -55°C) + humidity (672 hours at 40°C 93%) Cycling Salt spray (5 days 2hrs salt spray + 22 hours humidity) Tested with the following environmental heat shrink boots: VG95343T06 (without inner coating) VG95343T18 (with inner coating) VG95343T28 (without inner coating, halogen free) VG95343T29 (with inner coating, halogen free)
High conductivity and shielding performance
Shielding performance not degraded after:
Compatibility with heat shrink boots of Cadmium plated connectors:
RoHS Compliance
Tin-Zinc is a Cadmium-free RoHS material Tested up to 2000 hrs. of salt spray
High Corrosion Resistance
QwikConnect • April 2023
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