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9.5 Corrosion of metals

Syllabus
0620–2026–2027
Topic
9.5
Level
—

9.5.1—Conditions required for the rusting of

  • State the conditions required for the rusting of iron and steel to form hydrated iron(III) oxide

9.5.2—Some common barrier methods

  • State some common barrier methods, including painting, greasing and coating with plastic

9.5.3—Barrier methods prevent rusting by

  • Describe how barrier methods prevent rusting by excluding oxygen or water

9.5.4—Use of zinc in galvanising as an

  • Describe use of zinc in galvanising as an example of a barrier method and sacrificial protection

9.5.5—Sacrificial protection in terms of the

  • Explain sacrificial protection in terms of the reactivity series and in terms of electron loss

Objective notes

5 learning objectives
ConceptIGCSE Chemistry