Edited due to not noticing your statement about being familiar with the Spyderco salt series.
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Statement below is taken from Boye's site, and is his/their claims, not mine.
Advanced Metallurgy for the Saltwater Environment
Extreme cutting and edge holding
Total resistance to saltwater corrosion
Fast sharpening on an ordinary whetstone
Compass safe
Boye Dendritic Cobalt is a super-performing, non-rusting cobalt-based alloy that excels on tough fibers such as hi-tech rigging line, deck line, and net. Not a steel, it is a mixture of cobalt, chrome, nickel, tungsten, silicon, iron, and carbon. It cuts aggressively and keeps cutting. It is completely impervious to seawater corrosion, and is non-magnetizeable.
Each Boye blade is permeated by a dense, branching, "dendritic" network of hard carbide crystals (see photo at right). At the cutting edge, these carbide crystals produce micro-serrations, which can be felt with the fingertip and heard when the knife slices through rope. The crystals help the edge keep its shape and integrity over time (i.e. exceptional edge-holding) and enhance its penetrating power, for deep cutting action.
Each sharpening exposes a fresh set of hard carbide micro-teeth.