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Junior Cycle · Junior Cycle Engineering

Junior Cycle Engineering: Finishes & corrosion

How often Finishes & corrosion comes up on the Engineering papers, every year it was asked, and questions to try.

CL Asked on 4 of the last 5 Common Level papers, most recently in 2026. most years

Finishes & corrosion, Common Level(6 marks)

Quick ones on Finishes & corrosion.

(a)What two things must be present for iron or steel to rust?
  1. Heat and sunlight
  2. Water and oxygen
  3. Oil and dry air
(b)What is galvanising?
  1. Dipping steel in melted plastic powder
  2. Heating steel, then quenching it in oil
  3. Coating steel with a layer of zinc
(c)Which finish thickens the oxide layer on aluminium and can add colour?
  1. Anodising
  2. Tempering
  3. Galvanising
Show the answers

(a) Water and oxygen

(b) Coating steel with a layer of zinc

(c) Anodising

Your turn: Common Level questions on Finishes & corrosion.

Common Level

Asked on 4 of the last 5 Common Level papers, most recently in 2026. most years

Every paper, year by year

YearWhere it came up
2026Q1c, Q3b
2025Not asked
2024Q2e
2023Q4a
2022Q1c

Links open the State Examinations Commission’s paper for that year.

More Finishes & corrosion questions

Finishes & corrosion, 3 marks

How is a plastic dip coating put on a steel tool handle?

  1. Brush cold liquid plastic on by hand
  2. Spray it with zinc, then heat it in oil
  3. Heat the metal and dip it in plastic powder
Show the answer

Heat the metal and dip it in plastic powder

The hot steel is dipped in a fluidised bed of plastic powder, which melts onto it and flows into a smooth coat. It gives grip, insulation and rust protection.

Finishes & corrosion, 3 marks

Why is steel garden furniture usually powder coated?

  1. To help it conduct electricity
  2. To stop rust and give a tough colour
  3. To make it softer and easier to bend
Show the answer

To stop rust and give a tough colour

Charged paint powder is sprayed on and baked in an oven into a hard, even skin. It keeps air and water off the steel, stopping rust, and comes in many colours.

Other Engineering topics

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