30 Questions
What causes concentration differences leading to rapid corrosion in crevice corrosion?
Solution stagnation in the crevices
Apart from passive metals, where else can crevice corrosion occur?
In non-metallic materials
What is recommended to be chosen to prevent crevice corrosion?
Non-absorptive materials
What should be avoided in vessel design to minimize crevice corrosion?
Designing with sharp corners and stagnant areas
What is suggested instead of soldering or welding to prevent crevice corrosion?
Adopting a soldering approach
How can solution deposits causing corrosion be effectively managed?
Apply protective coatings inside the vessels
What is the process that occurs in two ways and includes passivation?
Corrosion Type
Which type of corrosion occurs because of contact between different metals?
Galvanic Corrosion
What is the weight loss of material by this type of corrosion small, but it is dangerous?
Pitting Corrosion
Which metal has the most negative standard electrode potential?
Sodium
Which type of corrosion is not listed in the five corrosion types?
Creep Corrosion
Which type of corrosion is caused by the coupling of two dissimilar alloys in the presence of a corrosive electrolyte?
Galvanic Corrosion
What is the main cause of hydrogen damage?
Presence of sulfur compounds
What is the common effect of pores on a material's structure?
Makes it brittle and decreases mechanical properties
What is the difference between fatigue and corrosion fatigue?
Fatigue cracks are typically intragranular
What process is recommended to prevent hydrogen damage?
Applying tempering process up to a maximum of 200°C
What is the impact of pores on a material's surface?
Can cause surface cracks
What is a common preventive measure for fatigue corrosion?
Decreasing or removing stress in the material
What is pitting corrosion primarily characterized by?
Corrosion focusing on narrow regions
What conditions can cause pitting corrosion?
Environments rich in Cl- and Br-
How does pitting corrosion affect the overall metal loss compared to homogeneous corrosion?
Total metal loss is much smaller
Which method is suggested to slow down the dissolution process in pitting corrosion?
Increasing the flow rate of solution
What is crevice corrosion primarily characterized by?
Corrosion in narrow crevices
Where does crevice corrosion typically occur?
Under the heads of gaskets, rivets, and bolts
What is one of the main problems associated with erosion corrosion?
It occurs in elbows, T-pipes, valves, pumps, mixers, and heat exchangers.
How can solid particles in the environment impact erosion corrosion?
They can play an abrasive role and increase the corrosion rate.
What is one of the most important precautions for preventing erosion corrosion?
Taking precautions at the design stage.
What causes cavitation corrosion?
It is caused by low-pressure zones.
What happens to vapor bubbles in cavitation corrosion?
They gradually grow and then explode.
What is the surface of the corroded material like in erosion corrosion?
It is rough and corrugated.
Test your knowledge on the passivation process and various types of corrosion including dealloying, hydrogen damage, stress corrosion, and galvanic corrosion. Identify the different ways corrosion can occur and how passivation helps prevent it.
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