Corrosion & Its Prevention (Edexcel GCSE Chemistry): Flashcards
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What is corrosion?
What is corrosion?
Process where metals deteriorate due to chemical reactions with environment
Most well-known form of corrosion
Most well-known form of corrosion
Rusting
What iron reacts with to cause rusting
What iron reacts with to cause rusting
Oxygen and water
Chemical name for rust
Chemical name for rust
Iron oxide
Effect of corrosion on metals
Effect of corrosion on metals
Reduces structural integrity and alters properties
How does painting prevent corrosion?
How does painting prevent corrosion?
Acts as protective barrier preventing environmental contact
What is electroplating?
What is electroplating?
Coating metal with another metal using electrical current
How greasing prevents corrosion
How greasing prevents corrosion
Barrier prevents moisture and oxygen contact
Protective coating aluminium forms naturally
Protective coating aluminium forms naturally
Aluminium oxide
Property of aluminium oxide layer
Property of aluminium oxide layer
Inert - doesn't react further, stops additional corrosion
What galvanisation involves
What galvanisation involves
Coating iron with more reactive metal (zinc)
How zinc protects iron in galvanisation
How zinc protects iron in galvanisation
Zinc corrodes first, providing sacrificial protection