MMET 207 Exam 3 Questions and Answers | Latest Version | 2024/2025 | Already Passed
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Module
MMET 207
Institution
MMET 207
MMET 207 Exam 3 Questions and
Answers | Latest Version | 2024/2025 |
Already Passed
What is the process of corrosion in metals?
Corrosion is the electrochemical reaction where metals deteriorate due to environmental
exposure, typically resulting in the formation of oxides or other compound...
MMET 207 Exam 3 Questions and
Answers | Latest Version | 2024/2025 |
Already Passed
What is the process of corrosion in metals?
✔✔Corrosion is the electrochemical reaction where metals deteriorate due to environmental
exposure, typically resulting in the formation of oxides or other compounds.
How does a galvanic cell operate in the context of corrosion?
✔✔A galvanic cell operates by using two different metals connected in an electrolyte, where the
more reactive metal (anode) corrodes faster while the less reactive metal (cathode) is protected.
What role does moisture play in the corrosion of metals?
✔✔Moisture acts as an electrolyte in corrosion processes, facilitating the movement of ions and
accelerating the electrochemical reactions that lead to metal deterioration.
What is the difference between uniform corrosion and localized corrosion?
✔✔Uniform corrosion affects the entire surface area of a metal evenly, while localized corrosion
occurs in specific areas, often leading to pitting or crevice corrosion.
1
,Explain the function of an anode in a corrosion process.
✔✔The anode is the electrode where oxidation occurs, causing the metal to lose electrons and
leading to its dissolution into the environment.
What is cathodic protection, and how does it work?
✔✔Cathodic protection involves using an external power source or sacrificial anodes to make
the protected metal the cathode of an electrochemical cell, thus reducing its corrosion rate.
What are the common types of corrosion that affect aluminum?
✔✔Common types of corrosion affecting aluminum include pitting corrosion, galvanic
corrosion, and stress corrosion cracking, each influenced by environmental factors and alloy
composition.
How can coatings prevent corrosion on metal surfaces?
✔✔Coatings act as barriers to moisture, oxygen, and contaminants, thereby reducing the
electrochemical reactions that lead to corrosion on metal surfaces.
What is the role of oxygen in the corrosion of iron?
2
,✔✔Oxygen is a key factor in the corrosion of iron, as it participates in the electrochemical
reactions that convert iron to iron oxide (rust), particularly in the presence of moisture.
How does pH affect the rate of corrosion?
✔✔The rate of corrosion is influenced by pH levels; lower pH (acidic conditions) generally
increases corrosion rates, while higher pH (alkaline conditions) can slow down the process.
What are sacrificial anodes, and why are they used?
✔✔Sacrificial anodes are more reactive metals intentionally attached to structures to corrode
preferentially, protecting the underlying metal from corrosion.
Describe the phenomenon of crevice corrosion.
✔✔Crevice corrosion occurs in confined spaces, such as gaps or crevices, where stagnant
electrolyte conditions can lead to localized corrosion, often exacerbated by differences in oxygen
concentration.
What is stress corrosion cracking, and what causes it?
✔✔Stress corrosion cracking is the growth of cracks in a material due to the combined effects of
tensile stress and a corrosive environment, often occurring in susceptible alloys.
3
, How can environmental factors influence corrosion rates?
✔✔Environmental factors such as temperature, humidity, and the presence of pollutants can
significantly affect corrosion rates, with higher temperatures and moisture levels typically
accelerating the process.
What methods can be used to detect corrosion in metal structures?
✔✔Common methods for detecting corrosion include visual inspections, ultrasonic testing, and
using corrosion monitoring sensors that measure changes in electrical resistance or potential.
Corrosion
Deterioration of a material or its properties because of a reaction with its environment
Anode, Cathode, Metal Path, Electrolyte, Energy Difference
Requirements for Electrochemical Corrosion Process
Anode
4
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