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Chemistry · L2 · Three Ways to Protect Big Metal Structures

An overview of alloying, sacrificial anodes, and barrier coatings — the main tools engineers use to fight corrosion on expensive structures, all under the umbrella of cathodic protection.

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Big metal structure to protectAlloying: add chromium to make stainless steelSacrificial anode: bolt on zinc or magnesiumBarrier coating: plate on a layer of tinInvisible oxide layer seals the surfaceMore reactive metal corrodes firstThin metal layer blocks water and airCathodic protection

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