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WorksheetsCauses and Prevention of Material Failure
Total questions: 25
Worksheet time: 13mins
What is the primary chemical reaction involved in iron corrosion?
Formation of iron chloride
Formation of iron oxide
Formation of iron sulfide
Formation of iron nitrate
What happens when a local anodic or cathodic point forms a corrosion cell in the surrounding surface?
Uniform corrosion
Pitting corrosion
Galvanic corrosion
Crevice corrosion
What can cause pitting corrosion by damaging or breaking the oxide film or protective coating?
Chloride ions
Oxygen
Hydrogen
Nitrogen
What is galvanic corrosion?
Corrosion that occurs when a single metal is exposed to air
Corrosion that occurs when two different metals are immersed in a common electrolyte
Corrosion that occurs due to high temperatures
Corrosion that occurs in the absence of moisture
Which of the following is an example of an electrolyte?
Pure water
Salt water
Dry air
Sand
What is the effect of galvanic corrosion on the cathode?
It corrodes faster
It remains protected
It becomes more active
It changes color
Which of the following is NOT a factor in galvanic corrosion?
Type of metals
Presence of an electrolyte
Temperature of the environment
Electrical contact between metals
What causes intergranular corrosion (IGC)?
Presence of impurities at the grain boundaries
High temperature exposure
Mechanical stress
Lack of oxygen
What can cause the enrichment or depletion of an alloying element at the grain boundaries?
Mechanical polishing
Chemical reactions
Heat treatment
Impurities
How is chemical corrosion characterized?
Formation of rust
Oxidation of a metal with an acid to form oxides
Melting of metal
Freezing of metal
Which of the following is an example of a protective coating method?
Sanding
Galvanising
Heating
Freezing
What role do corrosion inhibitors play in preventing corrosion?
They change the material's color
They act as anticorrosive chemical compounds
They increase the material's weight
They make the material more flexible
What is the visual result of a cup-and-cone fracture?
Smooth surface
Rough surface
Cup and cone shapes
Flat surface
What is the effect of temperature on the rate of corrosion?
Decreases the rate of corrosion
Increases the rate of corrosion
Has no effect on the rate of corrosion
Reverses the corrosion process
Which of the following materials is most resistant to corrosion?
Iron
Copper
Aluminum
Stainless steel
What is the primary cause of stress corrosion cracking?
Excessive lubrication
High humidity
Mechanical stress combined with a corrosive environment
Low temperature
What is the primary purpose of a sacrificial anode in corrosion prevention?
To enhance the metal's color
To corrode in place of the protected metal
To act as a protective barrier
To increase the weight of the metal
Which of the following metals is most likely to act as an anode in a galvanic cell?
Silver
Gold
Iron
Platinum
What is the main characteristic of uniform corrosion?
Localized attack on the metal surface
Cracking along grain boundaries
Formation of deep pits
Even material loss over the entire surface
What is the effect of oxygen concentration on the rate of corrosion?
Reverses the corrosion process
Has no effect on the rate of corrosion
Increases the rate of corrosion
Decreases the rate of corrosion
Which of the following is a common method to prevent crevice corrosion?
Using more reactive metals
Using larger crevices
Applying a protective coating
Increasing the temperature
What is the primary consequence of pitting corrosion?
Uniform material loss
Localized holes or pits
Change in metal color
Increase in metal weight
Which of the following is a common sign of crevice corrosion?
Uniform rusting
Localized rusting in confined spaces
Increase in metal weight
Change in metal color
What is the primary function of a passivation layer on metals?
To enhance the metal's color
To protect the metal from corrosion
To increase the metal's weight
To make the metal more flexible
Which of the following environments is most likely to accelerate corrosion?
Pure water
Saltwater
Dry air
Sand
