Read the following passage:
Sacrificial zinc anodes are mounted on the submerged steel hulls and bronze propellers of ocean-going vessels to prevent galvanic corrosion in seawater. Because zinc possesses a more negative electrochemical potential than steel or bronze, electrical current in the conductive saltwater flows preferentially from the zinc, causing it to oxidize and corrode while leaving the ship's primary structural metals intact. However, this protective reaction requires continuous electrical and physical contact between the zinc and the surrounding electrolyte. If an anode is thoroughly covered by marine biofouling organisms, electrical flow is blocked.
Based on this passage, it can be logically concluded that a vessel whose zinc anodes become heavily encrusted with marine growth will lose galvanic corrosion protection even if substantial unoxidized zinc remains.
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