Corrosion of Ceramic Materials
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Questions and Answers

What design consideration helps to avoid galvanic corrosion?

  • Adding more corners and edges to the design
  • Insulating different metals from each other (correct)
  • Using different metals for all parts of the structure
  • Creating complex structures in the design
  • Which type of design is recommended to reduce corrosion?

  • Designs with intricate structures
  • Complex designs with many inner surfaces
  • Simple designs with few corners and edges (correct)
  • Designs with sharp edges and angles
  • What should be considered for the discharge opening of a tank during its design?

  • It should be placed in the middle of the tank
  • It should have complex mechanisms for controlled release
  • It should be inclined to avoid water accumulation after flushing (correct)
  • It should be vertical to allow easy drainage
  • Why is welding preferred over bolts and rivets in metal connections?

    <p>Welding ensures a more cathodic connection</p> Signup and view all the answers

    What design feature is recommended for parts of a system expected to corrode quickly?

    <p>Designing them for easy replacement</p> Signup and view all the answers

    Why should gaps that occur during connections be avoided in design?

    <p>Gaps can lead to isolation and must be avoided</p> Signup and view all the answers

    What can be done to control the formation of a protective precipitate layer in heating and cooling water?

    <p>Reacting oxygen with additives</p> Signup and view all the answers

    How can the hardness of water be removed?

    <p>Reacting oxygen with additives</p> Signup and view all the answers

    Which substances are rendered less harmful by increasing their concentration due to their high oxidizing properties?

    <p>HNO3, H2SO4, H3PO4</p> Signup and view all the answers

    What is the effect of reducing the concentration of corrosive substances on the corrosion rate?

    <p>Decreases the corrosion rate</p> Signup and view all the answers

    Which type of inhibitors are effective in anodic regions for steel?

    <p>Chromates and benzoate</p> Signup and view all the answers

    In what conditions are inhibitors effective on metal surfaces?

    <p>Both atmospheric and aqueous medium in wet conditions</p> Signup and view all the answers

    What is the purpose of cathodic protection?

    <p>Forcing the metal to act as the cathode</p> Signup and view all the answers

    What are the common metals used in sacrificial anodes for cathodic protection?

    <p>Zinc, Magnesium, and Aluminum-Zinc alloys</p> Signup and view all the answers

    Why are sacrificial anodes called 'sacrificial'?

    <p>Because they corrode instead of the protected structure</p> Signup and view all the answers

    In cathodic protection with sacrificial anodes, what is added to protect the structures?

    <p>Metals disposed within anode bed</p> Signup and view all the answers

    Which method provides a uniform current distribution along buried pipes?

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

    Why is Magnesium a commonly used metal for sacrificial anodes?

    <p>It has low potential and provides high current</p> Signup and view all the answers

    What type of processes are involved in the corrosion of ceramic materials?

    <p>Simple chemical dissolution</p> Signup and view all the answers

    Why are ceramic materials frequently utilized?

    <p>For their resistance to corrosion</p> Signup and view all the answers

    What must refractory ceramics resist in many instances?

    <p>High-temperature attack by molten metals, salts, slags, and glasses</p> Signup and view all the answers

    In what way do ceramic materials outperform metals in harsh environments?

    <p>By corroding less at high temperatures and pressure</p> Signup and view all the answers

    What distinguishes degradation of polymeric materials from corrosion?

    <p>Degradation and corrosion processes are dissimilar</p> Signup and view all the answers

    Why are polymeric materials said to experience degradation rather than corrosion?

    <p>To emphasize the difference in underlying processes</p> Signup and view all the answers

    What is the primary effect of anodic inhibitors on the surface?

    <p>They passivate the surface</p> Signup and view all the answers

    What happens when there is less than enough presence of anodic inhibitors in the environment?

    <p>Corrosion is accelerated</p> Signup and view all the answers

    How do cathodic inhibitors function?

    <p>They precipitate on the cathode regions</p> Signup and view all the answers

    What are some examples of cathodic inhibitors?

    <p>Both a and b</p> Signup and view all the answers

    What are mixed inhibitors?

    <p>They are organic based</p> Signup and view all the answers

    How do mixed inhibitors show their effects?

    <p>By adsorption</p> Signup and view all the answers

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