Magnetic Autolocking Carabiner

It would seem that a zinc coating would reduce the galvanic action. Likely the biner's life cycle would be shorter than the time it would take for galvanic action to do any damage.

Another point that was raised in the comments on the video page is the effect of temperature. Cold makes for better magnets, hot can diminish the magnetic effect. Life span of an iron magnet is somewhere around 300+ yrs.
 

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