Corrosion Prevention Methods
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Questions and Answers

What is the term for the important over-voltage related to activation polarization?

  • Concentration polarization
  • Reduction reaction
  • Cathodic protection
  • Activation polarization (correct)
  • Which process involves atoms combining to form molecules?

  • Atoms to molecule 2H → H2 (correct)
  • Adsorption of H+ solution to zinc
  • Coalescence of molecules into bubbles
  • Reduction of H ions at the surface
  • What type of corrosion involves oxidation and reduction reactions occurring uniformly over surfaces?

  • Erosion-corrosion
  • Stress corrosion
  • Uniform attack (correct)
  • Passivity
  • Which phenomenon limits the reaction rate due to diffusion?

    <p>Concentration polarization</p> Signup and view all the answers

    Under what conditions do normally active metals become extremely inert?

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

    What is a method used to prevent corrosion by making a metal surface the cathode of an electrochemical cell?

    <p>Cathodic protection</p> Signup and view all the answers

    How do inhibitors contribute to corrosion prevention?

    <p>Slow oxidation/reduction reactions by removing reactants</p> Signup and view all the answers

    In the context of corrosion prevention, what is the purpose of cathodic (or sacrificial) protection?

    <p>To attach a more anodic material to the one to be protected</p> Signup and view all the answers

    How does material selection play a role in corrosion prevention?

    <p>By choosing materials that are less susceptible to corrosion</p> Signup and view all the answers

    Why are coatings applied in the context of corrosion prevention?

    <p>To act as physical barriers that reduce rates of oxidation and reduction</p> Signup and view all the answers

    How does environmental alteration contribute to corrosion prevention?

    <p>By altering environmental conditions to reduce corrosiveness</p> Signup and view all the answers

    What is the primary purpose of adding inhibitors in corrosion prevention?

    <p>To decrease reactivity in the solution by slowing down oxidation/reduction reactions</p> Signup and view all the answers

    What is the main factor that influences the rate of corrosion?

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

    What type of protection involves using an external DC power source and an inert anode?

    <p>Impressed current protection</p> Signup and view all the answers

    In cathodic protection, which method involves using zinc coatings to protect the base metal?

    <p>Galvanizing protection</p> Signup and view all the answers

    What environmental effect makes ductile metals more susceptible to corrosion after cold working?

    <p>Increase in strength</p> Signup and view all the answers

    Which method of cathodic protection involves creating a galvanic couple by using a sacrificial anode?

    <p>Sacrificial anode protection</p> Signup and view all the answers

    In oxidation reactions, what is the product when a metal reacts with oxygen to form a divalent metal oxide?

    <p>$MO$</p> Signup and view all the answers

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