Preventing rusting by using sacrificial protection

2 marks · Hard

State one example of a structure (not previously listed in examples) that can be protected from rusting using sacrificial anodes, and name a suitable metal that could be used as the sacrificial anode for this structure.

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

Also accept: Offshore oil drilling rigs; zinc. ; Steel reinforcement bars in concrete foundations; magnesium. ; Harbour pier support pylons; aluminium.

Common mistakes: Giving ship hulls, pipelines or water tanks as examples (do not allow, as these are common/previous examples).; Naming a metal not more reactive than iron.

Show mark scheme and worked solution

Marking points

B1 · 1 mark · States a correct example of a structure not previously listed (e.g., offshore oil rigs, steel-reinforced concrete, harbour pylons).

B2 · 1 mark · Names a suitable more reactive metal (zinc, magnesium, or aluminium).

Worked solution

An offshore oil drilling rig can be protected from rusting using sacrificial anodes. Suitable metals include zinc or aluminium.