Corrosion Types and Passivation Process Quiz

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Questions and Answers

What causes concentration differences leading to rapid corrosion in crevice corrosion?

  • High oxygen levels outside the crevice
  • Excessive heat in the crevice
  • Presence of solid particles in the crevice
  • Solution stagnation in the crevices (correct)

Apart from passive metals, where else can crevice corrosion occur?

  • In non-metallic materials (correct)
  • In alloys with high corrosion resistance
  • Active metals
  • Only in highly acidic environments

What is recommended to be chosen to prevent crevice corrosion?

  • Corrosive solutions
  • Materials that promote sharp corners
  • Absorptive materials
  • Non-absorptive materials (correct)

What should be avoided in vessel design to minimize crevice corrosion?

<p>Designing with sharp corners and stagnant areas (A)</p> Signup and view all the answers

What is suggested instead of soldering or welding to prevent crevice corrosion?

<p>Adopting a soldering approach (C)</p> Signup and view all the answers

How can solution deposits causing corrosion be effectively managed?

<p>Apply protective coatings inside the vessels (A)</p> Signup and view all the answers

What is the process that occurs in two ways and includes passivation?

<p>Corrosion Type (B)</p> Signup and view all the answers

Which type of corrosion occurs because of contact between different metals?

<p>Galvanic Corrosion (B)</p> Signup and view all the answers

What is the weight loss of material by this type of corrosion small, but it is dangerous?

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

Which metal has the most negative standard electrode potential?

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

Which type of corrosion is not listed in the five corrosion types?

<p>Creep Corrosion (D)</p> Signup and view all the answers

Which type of corrosion is caused by the coupling of two dissimilar alloys in the presence of a corrosive electrolyte?

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

What is the main cause of hydrogen damage?

<p>Presence of sulfur compounds (B)</p> Signup and view all the answers

What is the common effect of pores on a material's structure?

<p>Makes it brittle and decreases mechanical properties (D)</p> Signup and view all the answers

What is the difference between fatigue and corrosion fatigue?

<p>Fatigue cracks are typically intragranular (B)</p> Signup and view all the answers

What process is recommended to prevent hydrogen damage?

<p>Applying tempering process up to a maximum of 200°C (C)</p> Signup and view all the answers

What is the impact of pores on a material's surface?

<p>Can cause surface cracks (D)</p> Signup and view all the answers

What is a common preventive measure for fatigue corrosion?

<p>Decreasing or removing stress in the material (A)</p> Signup and view all the answers

What is pitting corrosion primarily characterized by?

<p>Corrosion focusing on narrow regions (C)</p> Signup and view all the answers

What conditions can cause pitting corrosion?

<p>Environments rich in Cl- and Br- (D)</p> Signup and view all the answers

How does pitting corrosion affect the overall metal loss compared to homogeneous corrosion?

<p>Total metal loss is much smaller (B)</p> Signup and view all the answers

Which method is suggested to slow down the dissolution process in pitting corrosion?

<p>Increasing the flow rate of solution (A)</p> Signup and view all the answers

What is crevice corrosion primarily characterized by?

<p>Corrosion in narrow crevices (B)</p> Signup and view all the answers

Where does crevice corrosion typically occur?

<p>Under the heads of gaskets, rivets, and bolts (C)</p> Signup and view all the answers

What is one of the main problems associated with erosion corrosion?

<p>It occurs in elbows, T-pipes, valves, pumps, mixers, and heat exchangers. (A)</p> Signup and view all the answers

How can solid particles in the environment impact erosion corrosion?

<p>They can play an abrasive role and increase the corrosion rate. (A)</p> Signup and view all the answers

What is one of the most important precautions for preventing erosion corrosion?

<p>Taking precautions at the design stage. (B)</p> Signup and view all the answers

What causes cavitation corrosion?

<p>It is caused by low-pressure zones. (C)</p> Signup and view all the answers

What happens to vapor bubbles in cavitation corrosion?

<p>They gradually grow and then explode. (B)</p> Signup and view all the answers

What is the surface of the corroded material like in erosion corrosion?

<p>It is rough and corrugated. (C)</p> Signup and view all the answers

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