A link to a video of an inspection for a group of zinc sacrificial anodes is above. The video is very long but all of the anodes have the same buildup on the exterior surface. Could this buildup prevent the functionality of the sacrificial anode? The anodes appear to be in pristine condition and I wanted to ensure that this was not because of the buildup preventing passage of current.
I am a mechanical engineer, so I have very little knowledge on this subject.