Iron is a highly versatile structural metal, but its durability is severely compromised by corrosion when exposed to atmospheric conditions.
State the two environmental substances that must be in contact with iron for rusting to occur.
Below are four industrial methods used to prevent the corrosion of iron and steel:
Complete the table below by selecting the most appropriate prevention method for each specified item. You may use each method once, more than once, or not at all.
| Item | Method |
|---|---|
| Cargo winch gears | |
| Structural steel girders of a bridge | |
| Wire refrigerator shelves |
Which of these metals is used to galvanise iron?
A lead
B tin
C zinc
D copper
