Everyone who has ever owned an ocean-going boat knows about the problem of galvanic corrosion — an electrochemical process by which one metal corrodes preferentially over another. It may be a wonderful thing if you're trying to create a battery… but it's not so great when your fittings, fasteners or propellers dissolve.
The exact same problem occurs when our aluminum Spectrum cameras are used subsea — especially when directly mounted to a chassis or frame made from a more “noble” material. The Naval Surface Treatment Center offers a great reference chart, adapted from a Naval Ships Technical Manual, to illustrate the galvanic potentials of common materials subsea.
In order to maximize the life of your camera and minimize maintenance costs, Inuktun recommends attaching sacrificial anodes directly to the camera body whenever operating subsea. Following extensive testing and evaluation, our engineers have come up with a simple and inexpensive solution that allows for safe and reliable operation, even when equipment is attached to steel structures.
As an example, our full anode package for new Spectrum 90™ cameras provides corrosion protection for up to 75 days of continuous immersion (although it is recommended that base anodes be changed every 30 to 45 days). Retrofit anode kits are also available for cameras already in service.
The picture on the left shows the difference between a protected (left) and unprotected (right) camera after only 15 days underwater.
For more information on Inuktun’s recommended anode packages for cathodic protection, please e-mail firstname.lastname@example.org or phone 1-877-468-5886.