A manufacturer is choosing a coating for steel clips used to hold roof tiles. The clips may be scratched during installation.
Two coatings were tested for 30 days in the same damp conditions.
| Coating | Coating material | Result when the coating was intact | Result after the coating was scratched |
|---|---|---|---|
| A | zinc | no rust | no rust |
| B | paint | no rust | rust formed |
Evaluate which coating should be used for the steel clips. In your answer, name the process used for coating A and explain the results.
118 exam-style questions on AQA GCSE Chemistry 10.3 Using materials, covering 10.3.1 Corrosion and its prevention, 10.3.2 Alloys as useful materials, and 10.3.3 Ceramics, polymers and composites. Each one has a worked solution and a mark scheme showing where the marks go.