The corrosion of iron or steel, in the presence of water and oxygen.

The gradual deterioration of a substance when it reacts with substances in the environment, for example when a metal oxidises in air.

Using a more reactive metal to corrode preferentially, to protect another metal from corrosion.

The process by which a thin, discoloured layer forms on the surface of a metal due to reactions with the environment, e.g. oxidation.

A process that uses electricity to deposit a thin layer of metal onto the surface of another conductive object.

Corrosion and its prevention

Chemistry

Transition metals

Introduction to reversible chemical reactions

Chemical equilibrium

Industrial equilibria: Haber Process

Percentage yield and atom economy

Equilibrium: balance between rate, safety, environment and economics

Making ammonia

NPK fertilisers, agriculture and other applications

Comparing materials and their properties

In the Rates and energy changes unit, pupils learned about how energy changes are always involved in reaction, along with a range of methods for measuring and comparing rates of reaction using properties of reactants and/or products.

This unit covers corrosion, prevention methods, and properties of alloys, ceramics, polymers, and metals. It explores industrial processes like the Haber process, fertiliser production, reaction rates, yields, atom economy, and the trade-offs involving conditions and equilibrium.

Industrial chemistry

Using a more reactive metal to corrode preferentially and protect another metal.

Covering a metal with plastic to prevent air exposure.

Cleaning a metal regularly to prevent tarnishing.

Which metal is often used to galvanise iron?

Which process involves the use of electricity to prevent corrosion and improve appearance?

To corrode preferentially and protect the less reactive metal.

What is the purpose of using a more reactive metal in sacrificial protection?

Rusting is a specific type of corrosion affecting {{}} in the presence of water and oxygen.

Complete the word equation for the rusting of iron.
iron + {{}} → (hydrated) iron(Ⅲ) oxide

Transition metals like copper and zinc are used in electrical applications because they are excellent {{}} of electricity.

When a metal reacts with oxygen, it often forms a {{}}.

A {{}} is formed when two or more elements are chemically bonded together.

Arrange the following metals in order of reactivity with oxygen (most reactive at the top, least reactive at the bottom).

The ability of a metal to be hammered into thin sheets without breaking is called...

The resistance of a metal to being scratched or dented is called {{}}.

Exit Quiz

What is sacrificial protection?