Corrosion
10 flashcards to master Corrosion
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What are the conditions required for the rusting of iron and steel?
The rusting of iron and steel requires the presence of both water (H₂O) and oxygen (O₂). Rust is hydrated iron(III) oxide (Fe₂O₃.xH₂O).
What is a barrier method of preventing rust?
Barrier methods prevent rust by creating a physical barrier between the iron/steel and the oxygen or water in the environment. Examples include painting, greasing, and coating with plastic.
How does painting prevent rusting?
Painting prevents rusting by creating an impermeable barrier that excludes oxygen and water from contacting the iron or steel surface. This stops the redox reaction that forms rust.
How does greasing prevent rusting?
Greasing prevents rusting by forming a water-repellent layer that excludes water and oxygen from contacting the iron or steel. This prevents the electrochemical process of rusting.
How does coating with plastic prevent rusting?
Coating with plastic provides a non-porous barrier that prevents oxygen and water from reaching the iron or steel surface, thus stopping the formation of rust.
What is galvanising?
Galvanising is a method of rust prevention that involves coating iron or steel with zinc. Zinc acts as both a barrier and provides sacrificial protection.
How does zinc act as a barrier in galvanising?
Zinc acts as a barrier by physically preventing water and oxygen from reaching the iron or steel surface. This is similar to painting.
Explain sacrificial protection in terms of the reactivity series.
A more reactive metal will corrode in preference to a less reactive metal. Zinc is more reactive than iron, so in galvanising, the zinc corrodes instead of the iron, sacrificing itself to protect the iron.
Explain sacrificial protection in terms of electron loss.
Sacrificial protection works because the more reactive metal (
Give an example of sacrificial protection other than galvanising
Attaching blocks of magnesium to the hull of a ship. Magnesium is more reactive than iron so it corrodes instead of the ship's hull.
Key Questions: Corrosion
What are the conditions required for the rusting of iron and steel?
The rusting of iron and steel requires the presence of both water (H₂O) and oxygen (O₂). Rust is hydrated iron(III) oxide (Fe₂O₃.xH₂O).
What is a barrier method of preventing rust?
Barrier methods prevent rust by creating a physical barrier between the iron/steel and the oxygen or water in the environment. Examples include painting, greasing, and coating with plastic.
What is galvanising?
Galvanising is a method of rust prevention that involves coating iron or steel with zinc. Zinc acts as both a barrier and provides sacrificial protection.
About Corrosion (9.5)
These 10 flashcards cover everything you need to know about Corrosion for your Cambridge IGCSE Chemistry (0620) exam. Each card is designed based on the official syllabus requirements.
What You'll Learn
- 3 Definitions - Key terms and their precise meanings that examiners expect
- 7 Key Concepts - Core ideas and principles from the 0620 syllabus
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After mastering Corrosion, explore these related topics:
- 9.4 Uses of metals - 10 flashcards
- 10.1 Water - 13 flashcards
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