Corrosion
Chapter Name : Electrochemistry |
Sub Topic Code : 102_12_03_09_01 |
Topic Name : Corrosion |
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Sub Topic Name : Corrosion |
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Introduction
• Corrosion is the phenomenon of slow degradation of metal surface due to formation of oxides or other salts of metals. • Rusting of iron is mainly caused due to presence of water and air. Rust is seen in the form of hydrated ferric ions. • Corrosion can be prevented by protective coating and electrochemical methods. . .
Pre-Requisites:
• Redox reactions • Galvanic cells
Activity:
The outer surface of pipelines, valves, and outdoor taps are usually corroded due to atmospheric oxygen and water.
Real Life Question:
Why does corrosion of metallic surfaces occur?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Corrosion | It is the phenomenon of slow degradation of metal surface due to formation of oxides or other salts of metals. |
| Rusting | Corrosion of iron is also called as rusting. |
| Anode | It is a positively charged electrode, where electrons are released or oxidation occurs. |
| Cathode | It is a negatively charged electrode, where electrons are accepted or reduction occurs. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Pipelines | The top of the pipelines are usually corroded due to atmospheric oxygen and moisture. |
Places to visit :
Home.
Practical examples around us
| Examples | Explainations |
|---|---|
| Home | Outdoor taps, silver showpieces usually develop a yellow or black coating due to corrosion. |
What you learn in Theory:
Corrosion- an electrochemical process.
What you learn in Practice:
Effect of corrosion on metallic objects.