Wet corrosion of CuNiFer pipe in seawater

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Wet corrosion CuNiFer pipes?
This CuNiFer alloy pipe is used in a seawater cooling system and is electrical insulted with nearby metals; this prevents galvanic corrosion to occur since there is no contact with other metals. I've seen multiple sources that say CuNiFer is very corrosion resistance.

The pipe is still protected with a zinc sacrificial anode (red painted bolt). I've found some about wet corrosion in CuNiFer pipes but i'm not sure if this is true. What is the purpose of this protection, against what kind of corrosion is this and what is the driving force of this corrosion? Can you give me the corresponding source?

The paper about CuNiFer wet corrosion: https://www.google.com/url?sa=t&rct...usg=AOvVaw1layEHHCPnsWGdlSPHU-gF&opi=89978449

ea84b2fd-dd40-4782-9ec3-5327ae0768dd.jpg
 
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