Principles of Corrosion Lecture Quiz

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Questions and Answers

What is the definition of corrosion?

  • Formation of a protective layer on metal surfaces
  • Destruction of metallic objects due to direct contact with the environment (correct)
  • Dissolution of metal due to exposure to air
  • Chemical reaction between metals and water

What is an example of chemical corrosion?

  • The reaction of aluminum with water
  • The reaction of iron with oxygen in the air
  • The chemical reaction between zinc metal and an acid (correct)
  • The combination of copper and tin to form bronze

What is dezincification?

  • A special chemical corrosion process affecting zinc and copper atoms (correct)
  • A process where zinc is converted into a gas
  • A reaction between zinc and aluminum
  • The formation of a protective layer on zinc surfaces

What is electrochemical corrosion also known as?

<p>Redox reaction (B)</p> Signup and view all the answers

What is graphitic corrosion?

<p>A special chemical corrosion process by which iron is leached from cast iron, leaving behind a weak, spongy mass of graphite. (D)</p> Signup and view all the answers

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Study Notes

Corrosion Overview

  • Corrosion is the gradual destruction of materials, especially metals, due to chemical reactions occurring in their environment.
  • It results in the deterioration of materials, leading to loss of strength and integrity.

Chemical Corrosion Example

  • An example of chemical corrosion is the rusting of iron, where iron reacts with oxygen and moisture, forming iron oxide (rust).

Dezincification

  • Dezincification is a specific type of corrosion that affects brass, which is an alloy of copper and zinc.
  • It occurs when zinc is selectively leached from the alloy, resulting in a porous, weak structure primarily composed of copper.

Electrochemical Corrosion

  • Electrochemical corrosion is also known as galvanic corrosion.
  • It arises from the electrochemical reaction between two dissimilar metals in contact within an electrolyte, leading to the deterioration of the less noble metal.

Graphitic Corrosion

  • Graphitic corrosion is a form of corrosion that affects cast iron, where the iron matrix is oxidized while graphite remains intact.
  • This results in the loss of iron, leading to a weakening of the material, while the graphite can remain, often appearing as a black residue.

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