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</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.</p> Signup and view all the answers

    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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    Description

    Test your knowledge of the principles of corrosion with this quiz covering definitions, types of corrosion, electrochemical cells, components of galvanic cells, standard half cells, and the electrochemical series.

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