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Questions and Answers
What is the anodic reaction in the presence of electrolyte?
What is the anodic reaction in the presence of electrolyte?
What factor affects the rate of galvanic corrosion?
What factor affects the rate of galvanic corrosion?
What happens to the rate of corrosion as the distance between two electrodes increases?
What happens to the rate of corrosion as the distance between two electrodes increases?
In which medium does the cathodic reaction occur for strong acidic conditions?
In which medium does the cathodic reaction occur for strong acidic conditions?
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What is the cathodic reaction for neutral or basic medium with pH between 4 and 10?
What is the cathodic reaction for neutral or basic medium with pH between 4 and 10?
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Study Notes
Forms of Corrosion
- Corrosion manifests in various forms, one of which is galvanic corrosion.
Galvanic Corrosion
- Also referred to as bimetallic corrosion, it's an electrochemical reaction where one metal preferentially corrodes when in contact with another metal in an electrolyte.
Dissimilar Metal Corrosion Cell
- Occurs when two different metals contact each other in the presence of an electrolyte.
- The less noble metal (more active) functions as the anode, while the more noble metal (less active) serves as the cathode.
Examples of Dissimilar Metal Corrosion Cell
- Copper bolt corroding with a steel nut:
- Corrosion cell formula: Fe / electrolyte / Cu.
- Anodic reaction (oxidation of iron):
- ( \text{Fe}{(s)} \rightarrow \text{Fe}^{2+}{(aq)} + 2e^- )
- Cathodic reactions can vary based on pH levels:
- For acidic conditions (pH < 4):
- ( 2\text{H}^{+}_{(aq)} + 2e^- \rightarrow \text{H}_2(g) )
- For neutral to basic conditions (pH = 4 to 10):
- ( \text{O}2(g) + 2\text{H}2\text{O}{(l)} + 2e^- \rightarrow 2\text{OH}^-{(aq)} )
- For acidic conditions (pH < 4):
Corrosion Protection Methods
- Protection strategies include the use of inhibitors and coatings to prevent or minimize corrosion.
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Description
Test your knowledge of galvanic corrosion and corrosion protection with this quiz. Learn about forms of corrosion, galvanic corrosion processes, and corrosion protection methods such as inhibitors and coatings.
