Corrosion of different metals
The materials required for the science fair project experiment:
- 3 copper sheets (cut to 1cm x 1cm)
- 3 aluminum sheets (cut to 1cm x1cm)
- 3 iron sheets (cut to 1cm x1cm)
- 3 zinc sheets (cut to 1cm x1cm)
- 12 beakers
- 1200ml of tap water
- 1200ml of salt water (100 gram of salt in 1200ml water)
- 1200ml of lime juice mixed with water (200ml lime and 1000ml water)
- 1 measuring cylinder
- 1 piece of cloth
- 1 bottle of alcohol
- 1 pair of scissors
- 1 ruler
- 1 black marker pen
1. For this science fair project, the independent variable is the type of metal and the solution the metal is immersed in. The dependent variable is the appearance of rust or corrosion on the metal sheets over time. This is determined by observing the surface of the metal after 2 day. The constants (control variables) are the size of the metal sheet, the amount of solution used and the length of time the rust is allowed to set in the metal sheets.
2. The science experiment is started by cutting the 4 types of metal sheets into 3 pieces each 1cm x 1cm in size. . The surface of the cut pieces are then cleaned with the cloth and alcohol.
3. The 12 beakers are filled with 300ml of tap water, salt water or lime juice, 4 beakers for each type of solution. The solution used is marked outside the beaker as “tap water”, “salt water” or “lime juice”.
4. The small metal pieces are placed inside the beakers. The 3 copper pieces will be placed in one beaker of tap water, one beaker of salt water and one beaker of lime juice. The beakers will be labeled “copper” on the outside. Similarly, the aluminum, iron and zinc pieces are placed in the beakers containing different solutions and labeled accordingly.
5. The beakers are placed aside for the next 2 days and after that observed for corrosion. The observations are recorded in the table below.
Basic safety requirements