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Coating with paints or oil or grease
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- The application of paint or oil or grease on metal surfaces keeps out air and moisture.
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Alloying
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- Alloyed metal is more resistant to corrosion. Example: stainless steel.
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Galvanization
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- This is a process of coating molten zinc on iron articles. Zinc forms a protective layer and prevents corrosion.
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Electroplating
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- It is a method of coating one metal with another by the use of an electric current.
- This method not only lends protection but also enhances the metallic appearance.
- Examples: silver plating, and nickel plating.

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Sacrificial Protection
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- Magnesium is more reactive than iron. When it is coated on articles made of iron or steel, it acts as the cathode undergoes a reaction (sacrifice) instead of iron and protects the articles
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