Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to __________.
β’ Galvanic corrosion between dissimilar metals in seawater β’ Role of sacrificial anodes (zincs) in a cooling system β’ Difference between corrosion protection and fouling/marine growth control
β’ Ask yourself: What is the main job of a zinc anode when itβs installed in contact with seawater and metals? β’ Which choice talks about stopping or reducing metal loss due to electrical/chemical action in seawater, rather than cleaning or coating? β’ Which options are really about cleanliness or marine growth, and which are about protecting metal from being eaten away?
β’ Verify which option refers to electrical/chemical attack on metals in seawater rather than physical cleanliness β’ Eliminate any choices that focus mainly on shiny/clean surfaces or marine growth, since that is not the primary purpose of zincs β’ Check that the remaining choice correctly matches the function of a sacrificial anode: it is the metal that is meant to be consumed first
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