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The extremely cold environment experienced by outboard cables used in the Earth's polar regions necessitates careful selection of polymers for use as jackets. The U.S. Navy has two specifications for neoprene (polychloroprene) cable jackets — one designated “Arctic neoprene” because of its extreme low temperature flexibility requirement (−54°C) and the other designated by default as “standard neoprene”...
The accelerated life test (ALT) is a tool used by cable manufacturers and cable end-users to determine how long a given piece of hardware will last once deployed into the marine environment. To conduct an ALT, the failure mechanism for the hardware in question must be known, and the kinetics of that process must be determined via experimentation. Typically, Arrhenius kinetics are assumed and the activation...
Finding coatings/surface treatments that are resistant to cathodic delamination is not an easy task. Both the materials used and the inter-material bonds must be able to survive exposure to a very high pH (13–14) environment. During the last two years, the U.S. Navy has been testing non-conductive ceramic (NCC) coatings and a proprietary polymeric coating made by Teledyne/D.G. O'Brien called “DGO-1”...
During the past two decades, non-conductive ceramic (NCC) coatings have been widely applied to connectors to prevent cathodic delamination. The ceramic comprising the NCC coating cannot support the electrochemical reactions (such as the reduction of dissolved oxygen to produce hydroxyl ions) that normally cause adhesive bonds to fail under cathodic delamination conditions. While the wide-scale adoption...
When undersea cable connectors are attached to receptacles that are part of a cathodically protected vessel hull, the encapsulants applied over the connector backshells to protect the interior of the connector from seawater ingression often rapidly debond from the backshell, thereby compromising the interior of the cable and connector. This process is called “cathodic delamination” or “cathodic disbondment”...
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