Impressed current cathodic hull protection systems are commonly used on modern vessels. What are these systems designed to replace or reduce?
• cathodic protection and how it prevents corrosion • difference between impressed current systems and sacrificial anode systems • what role zinc anodes traditionally play on a ship's hull
• Ask yourself: when we add electrical current to protect steel, what older corrosion‑control method is this modern system improving on? • Which of the answer choices is directly related to corrosion control of steel in seawater rather than magnetic influence or cosmetics? • Think about how ships were commonly protected from rust below the waterline before impressed current systems became widespread.
• Identify which options are specifically about corrosion protection of underwater steel surfaces. • Eliminate options that deal mainly with appearance (cosmetic coating) or magnetic fields rather than electrochemical corrosion. • Recall that traditional hull protection often used blocks of a more active metal attached to the hull—match that idea to the correct choice.
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