WorksheetsCorrosion
Total questions: 20
Worksheet time: 10mins
What is corrosion
The physical breakdown of materials
A chemical or electrochemical reaction that results in the deterioration of a material
A mechanical process of shaping metals
The process of melting metals
Which of the following is a component of a corrosion cell?
Electrolyte
Cathode
Anode
All of the above
What process occurs at the anode in corrosion
Reduction
Oxidation
Hydrogen formation
Oxygen absorption
What type of corrosion occurs when two dissimilar metals are in contact in the presence of an electrolyte
Galvanic corrosion
Pitting corrosion
Stress corrosion cracking
Fretting corrosion
Which of the following is a common cause of pitting corrosion?
Attack by halide ions
High temperature
Chemical contamination
Stress in the material
What is the main factor contributing to erosion corrosion?
Low flow velocity
High velocity of seawater
High temperature
Chemical impurities
What causes stress corrosion cracking (SCC)?
High mechanical stress combined with a corrosive environment
High temperature
Low oxygen levels
High humidity
What is dealloying
The removal of the active component of an alloy
The addition of alloying elements to increase strength
The process of coating metal with a protective film
The separation of materials into their base components
What type of corrosion occurs in metals exposed to a corrosive environment with repeated cyclic loading?
Stress corrosion cracking (SCC)
Corrosion fatigue
Galvanic corrosion
Erosion corrosion
What is the primary cause of fretting corrosion?
High cyclic stress
Slight vibratory motion between metal surfaces
Contact with seawater
Presence of chlorine ions
Which type of alloy is most susceptible to dezincification?
Copper alloys
Brass (zinc and copper)
Stainless steel
Cast iron
What is the best prevention method for corrosion in a boiler system?
Use of anti-fouling paints
Keeping the boiler water alkaline and removing dissolved oxygen
Increasing temperature to speed up chemical reactions
Adding chloride to the water
Which of the following conditions is necessary for stress corrosion cracking (SCC) to occur?
A susceptible metal, a specific environment, and tensile stress
High temperature and high oxygen concentration
Presence of pH greater than 9
Low humidity and low temperature
What does the formation of a passive oxide film on metals do?
It speeds up corrosion
It facilitates the flow of electrons
It prevents corrosion by acting as a barrier
It promotes the breakdown of the metal
Select the factors that affecting the process of corrosion
Dissimilar metals
Concentration of electrolyte
Concentration of oxygen
All above
The electrode in contact with the dilute electrolyte acts as the
Cathode
Anode
Salt bridge
Reference electrode
The electrode in contact with the concentrated electrolyte acts as the
Anode
Cathode
Neither anode nor cathode
Both anode and cathode
In an electrochemical system, the electrode in contact with the less oxygenated solution acts as the
Cathode
Anode
Salt bridge
Inert electrode
The electrode exposed to the more oxygenated solution behaves as the
Anode
Cathode
Neutral electrode
Separator
When two dissimilar metals come into contact in an electrolyte, the phenomenon is known as
Electrolytic polishing
Galvanic coupling
Passivation
Hydrogen embrittlement
