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 (C)</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 (A)</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 (C)</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 (C)</p> Signup and view all the answers

How can the hardness of water be removed?

<p>Reacting oxygen with additives (A)</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 (D)</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 (A)</p> Signup and view all the answers

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

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

What is the purpose of cathodic protection?

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

Why are sacrificial anodes called 'sacrificial'?

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

Which method provides a uniform current distribution along buried pipes?

<p>Cathodic protection with sacrificial anodes (A)</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 (D)</p> Signup and view all the answers

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

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

Why are ceramic materials frequently utilized?

<p>For their resistance to corrosion (D)</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 (C)</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 (B)</p> Signup and view all the answers

What distinguishes degradation of polymeric materials from corrosion?

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

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

<p>They passivate the surface (C)</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 (D)</p> Signup and view all the answers

How do cathodic inhibitors function?

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

What are some examples of cathodic inhibitors?

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

What are mixed inhibitors?

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

How do mixed inhibitors show their effects?

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

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