15 Questions
What is the primary difference between dry and wet corrosion?
Presence of moisture
Which type of corrosion occurs when two dissimilar metals are in contact with each other?
Galvanic corrosion
What is the term for the process by which a more noble metal corrodes in preference to a less noble metal?
Cathodic protection
Which type of corrosion occurs along the grain boundaries of a metal?
Inter-granular corrosion
What is the rule that states that the corrosion rate of a metal is inversely proportional to its thickness?
Pilling Bed worth rule
What is the primary mechanism of pitting corrosion?
Formation of a differential aeration cell
Which type of corrosion occurs when there is a difference in oxygen concentration between two areas?
Concentration cell corrosion
What is the purpose of the Pilling Bedworth rule?
To predict the rate of corrosion
What is the primary difference between dry and wet corrosion in terms of the role of oxygen?
Wet corrosion requires oxygen, while dry corrosion does not
Which type of corrosion is more likely to occur in areas with high humidity?
Wet corrosion
What is the primary mechanism of inter-granular corrosion?
Segregation of impurities along grain boundaries
What is the primary reason for the formation of waterline corrosion?
Crevice corrosion due to the formation of a crevice between the waterline and the metal surface
What is the primary application of the Pilling Bedworth rule?
Predicting the oxidation rate of metals
What is the primary factor that determines the severity of stress corrosion?
Level of stress applied to the metal
What is the primary difference between pitting corrosion and galvanic corrosion?
Mechanism of corrosion
Study Notes
Corrosion
- Definition: Deterioration of materials, usually metals, due to reaction with their environment
-
Types of Corrosion:
- Dry Corrosion: Occurs in the absence of moisture, often due to chemical reactions
- Wet Corrosion: Occurs in the presence of moisture, leading to electrochemical reactions
Mechanism of Corrosion
- Involves oxidation of the metal surface, resulting in loss of electrons
- Counter reaction involves reduction of oxygen, resulting in gain of electrons
- Formation of corrosion cells, leading to corrosion reactions
Types of Corrosion
Pitting Corrosion
- Definition: Localized corrosion, forming small pits on the metal surface
- Causes: Presence of chlorides, sulfides, or other aggressive ions
Waterline Corrosion
- Definition: Corrosion occurring at the waterline or interface between water and air
- Causes: Concentration cells formed due to difference in oxygen levels
Inter-Granular Corrosion
- Definition: Corrosion occurring along grain boundaries in the metal
- Causes: Segregation of impurities or carbides along grain boundaries
Galvanic Corrosion
- Definition: Corrosion occurring when two dissimilar metals are in contact
- Causes: Electrochemical potential difference between the two metals
Stress Corrosion
- Definition: Corrosion accelerated by the presence of stress on the metal
- Causes: Combination of mechanical stress and corrosive environment
Pilling-Bedworth Rule
- Definition: States that a protective oxide film will form if the volume of oxide is less than the volume of metal consumed
- Application: Predicting the likelihood of a metal forming a protective oxide layer
Corrosion
- Definition: Deterioration of materials, usually metals, due to reaction with their environment
-
Types of Corrosion:
- Dry Corrosion: Occurs in the absence of moisture, often due to chemical reactions
- Wet Corrosion: Occurs in the presence of moisture, leading to electrochemical reactions
Mechanism of Corrosion
- Involves oxidation of the metal surface, resulting in loss of electrons
- Counter reaction involves reduction of oxygen, resulting in gain of electrons
- Formation of corrosion cells, leading to corrosion reactions
Types of Corrosion
Pitting Corrosion
- Definition: Localized corrosion, forming small pits on the metal surface
- Causes: Presence of chlorides, sulfides, or other aggressive ions
Waterline Corrosion
- Definition: Corrosion occurring at the waterline or interface between water and air
- Causes: Concentration cells formed due to difference in oxygen levels
Inter-Granular Corrosion
- Definition: Corrosion occurring along grain boundaries in the metal
- Causes: Segregation of impurities or carbides along grain boundaries
Galvanic Corrosion
- Definition: Corrosion occurring when two dissimilar metals are in contact
- Causes: Electrochemical potential difference between the two metals
Stress Corrosion
- Definition: Corrosion accelerated by the presence of stress on the metal
- Causes: Combination of mechanical stress and corrosive environment
Pilling-Bedworth Rule
- Definition: States that a protective oxide film will form if the volume of oxide is less than the volume of metal consumed
- Application: Predicting the likelihood of a metal forming a protective oxide layer
Corrosion
- Definition: Deterioration of materials, usually metals, due to reaction with their environment
-
Types of Corrosion:
- Dry Corrosion: Occurs in the absence of moisture, often due to chemical reactions
- Wet Corrosion: Occurs in the presence of moisture, leading to electrochemical reactions
Mechanism of Corrosion
- Involves oxidation of the metal surface, resulting in loss of electrons
- Counter reaction involves reduction of oxygen, resulting in gain of electrons
- Formation of corrosion cells, leading to corrosion reactions
Types of Corrosion
Pitting Corrosion
- Definition: Localized corrosion, forming small pits on the metal surface
- Causes: Presence of chlorides, sulfides, or other aggressive ions
Waterline Corrosion
- Definition: Corrosion occurring at the waterline or interface between water and air
- Causes: Concentration cells formed due to difference in oxygen levels
Inter-Granular Corrosion
- Definition: Corrosion occurring along grain boundaries in the metal
- Causes: Segregation of impurities or carbides along grain boundaries
Galvanic Corrosion
- Definition: Corrosion occurring when two dissimilar metals are in contact
- Causes: Electrochemical potential difference between the two metals
Stress Corrosion
- Definition: Corrosion accelerated by the presence of stress on the metal
- Causes: Combination of mechanical stress and corrosive environment
Pilling-Bedworth Rule
- Definition: States that a protective oxide film will form if the volume of oxide is less than the volume of metal consumed
- Application: Predicting the likelihood of a metal forming a protective oxide layer
Test your knowledge on corrosion, its types, and mechanisms, including dry and wet corrosion, pitting corrosion, galvanic corrosion, and more. Also, covers energy storage systems.
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